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GSFC X-673-64-1F

ENGINEERING DRAWINGS T A N D A R D S M A N U A L

Augus t 1994

N A T I O

N A L

A E R O N

A U T I C

S AND S P A C E A

D M

I

N

I

S T R A T I O

N

U . S. A.

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X-673-64-1F Supersedes GSFC X-673-64-1E/July 1991

ENGINEERING DRAWINGS T A N D A R D S M A N U A L

Mechanical Engineering BranchGoddard Space Flight Center

Greenbelt, Maryland

Augus t 1994

N A T I O

N A L

A E R O N

A U T I C

S AND S P A C E A D M

I N I S T R A T I O

N

U . S. A.

National Aeronautics andSpace Administration

Goddard Space Flight Center

Greenbelt, Maryland 20771

1994

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DESCRIPTION OF REVISION

This revision, which supersedes the Goddard Space Fl ight Center (GSFC) Standard

X-673-64-1E, Engineering Drawing S tandards Manual , is intended to update and reflect

the latest formats and standards adopted by GSFC.

The fol lowing is a summary of the principal changes and improvements incorporated in

this issue:

a. Addit ion of Composi te Material Drawing defini t ion.

b. Changing of the signature to a printed name in Tit le blocks.

c. New example of the Metric Drawings format and tolerance presentat ion.

d. Improved placement of views on Types of Drawings samples to prevent unnecessary

rework of drawings at a later date.

e. New Engineering Order (EO) forms added; old EO forms wil l be phased out .

f . Addit ional notes on various topics added to Note Examples sect ion.

g. Delet ion of microfi lming requirements for drawing format .

h. Flow chart for f l ight projects redefined.

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v

PREFACE

The GSFC Engineering Drawing S tandards Manual is the off icial source for the

requirements and interpretat ions to be used in the development and presentat ion of

engineering drawings and related documentat ion for the GSFC.

The Mechanical Engineering Branch, Mechanical Systems Division, has been delegated

the responsibi l i ty for interpretat ion, periodic updates, and distr ibut ion of the GSFC

Engineer ing Drawing S tandards Manual .

All Engineering Directorate design organizat ions and their contractors shal l adhere to the

requirements of this manual when preparing GSFC engineering documentat ion for f l ight

hardware and ground support systems.

Comments or inquir ies concerning this manual should be directed to the Mechanical

Engineering Branch, Code 722.

Dr. Allan Sherman

Director of Engineering

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X-673-64-1F GODDARD SPACE FL I GHT CENTER, Greenbe l t , M ary lan d

ENGINEERING DRAWING STANDARDS MANUAL v i i

TABLE OF CONTENTSINTRODUCTION .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1. DRAWING ELEMENTS .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.1. Drawing Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.2 . Mul t i sheet Drawings . . . . . . .. . . . . . .. . . . . .. . . . . . .. . . . . .. . . . . . .. . . . . . .. . . . . .. . . . . . .. . . . . .. . . . . . .. . . . . .. . . . . . .. . 3

1.3. Zoning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.4 . T i t le Block and Revis ion Block . . . . . . .. . . . . .. . . . . . .. . . . . .. . . . . . .. . . . . .. . . . . . .. . . . . . .. . . . . .. . . . . . .. . . . . .. 41.5. Drawing Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

2. NOMENCLATURE .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.1. Drawing Tit le . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.2. Abbreviat ions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.3. List of Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

2.3.1. Requirements on the Body of the Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.3.2. Requirements in the List of Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.4. Notes on Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 5

2.4.1. Securi ty Classif icat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

2.4.2. Note Locat ion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

2.4.3. Numbering of Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

2.4.4. Note Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

2.4.4.1. Dimension Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .162.4.4.2. Heat Treat ing Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

2.4.4.3. Joining Method Notes (welding, brazing, etc. ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

2.4.4.4. Plat ing and Coating Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

2.4.4.5. Surface Preparat ion Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2.4.4.6. Test ing and Inspect ion Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

2.4.4.7. Threaded Inserts — Cleaning and Instal lat ion Notes . . . . . . . . . . . . . . . . . . . . . . .20

2.4.4.8. Miscel laneous Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

2.4.4.9. Informational Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

2.4.5. Local Character Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

2.4.6. General Dimensional Tolerance Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

2.5. Specif icat ion Callouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

3. DRAFTING PRACTICES .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

3.1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .253.2. Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

3.2.1. Ink Lines and Plot ted Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

3.2.2. Penci l Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

3.2.3. Types of Lines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

3.2.3.1. Center Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

3.2.3.2. Dimension Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

3.2.3.3. Leaders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

3.2.3.4. Break Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

3.2.3.5. Phantom Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

3.2.3.6. Sect ioning Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

3.2.3.7. Extension Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

3.2.3.8. Hidden Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

3.2.3.9. St i tch Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .303.2.3.10. Outl ines or Visible Lines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

3.2.3.11. Datum Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

3.2.3.12. Cutt ing-Plane/Viewing-Plane Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

3.3. Let ter ing and Numerals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

3.3.1. Style . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 1

3.3.2. Heights. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

3.4. Scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

3.5. Posi t ioning the Part on the Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

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3.5.1. Picturizat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

3.5.2. Sect ions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

3.5.3. Views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

3.5.4. Detai ls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

3.5.5. Ident if icat ion of Sect ions, Views, and Detai ls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

3.5.6. Locat ing Sect ions, Views, and Detai ls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

4. TYPES OF DRAWINGS .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .394.1. Altered or Selected Vendor Part Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

4.2. Assembly Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

4.3. Detai l Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

4.4. Drawing Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

4.5. Electr ical /Electronic Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

4.5.1. Electr ical and Electronic Symbols. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

4.5.2. Electr ical and Electronic Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

4.6. Inseparable Assembly Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

4.7. Instal lat ion Assembly Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

4.8. Interface Control Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

4.9. Matched-Set Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

4.10. Mechanical Schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49

4.11. Modificat ion Drawing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .514.12. Outl ine Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

4.13. Source Control Drawing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

4.14. Specif icat ion Control Drawing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

4.15. Standard Part Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

4.16. Tabulated Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

4.17. Tooling Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

4.18. Composi te Material Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

5. NUMBERING SYSTEM FOR DRAWINGS AND SUPPORTING DOCUMENTATION .60

5.1. Part Numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 1

5.2. Find or I tem Numbering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62

5.3. Order of Precedence of Specif icat ions and Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

5.3.1. Group I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62

5.3.2. Group II . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

5.3.3. Group III . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

5.3.4. Group IV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

5.3.5. Group V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63

6. ENGINEERING ORDER .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64

6.1. General Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64

6.2. Format Sample. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64

7. DRAWING REVISIONS .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68

7.1. Revision Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68

7.2. Revision Ident if icat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68

7.3. Revision of Mult isheet Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

7.4. Revision Recording . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68

7.5. Redrawn or Replaced Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70

8. PARTS LIST AND INDEX LIST .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71

8.1. Defini t ions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71

8.2. Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71

8.2.1. List Preparat ion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71

8.2.2. List Formats. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72

8.2.3. Revision Ident if icat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

8.2.4. Delet ing I tems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72

8.2.5. Adding I tems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72

8.3. Cover Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72

8.3.1. Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72

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8.3.2. Entr ies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72

8.4. Parts List Continuat ion Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75

8.4.1. Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75

8.4.2. Entr ies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75

8.5. Index List Continuat ion Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77

8.5.1. Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77

8.5.2. Entr ies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .778.6. Find or I tem Number System of Ident if icat ion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79

8.6.1. Defini t ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 9

8.6.2. Applicat ion and Limitat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

8.6.3. Drawing Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80

8.7. List of Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81

8.7.1. Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81

8.7.2. Entr ies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81

9. DOCUMENTATION MANAGEMENT .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82

9.1. Typical Drawing Flow for Fl ight Projects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

9.2. Archiving. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83

9.3. Computer-Aided Design Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

9.3.1. Presentat ion of Computer-Generated Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83

9.3.2. Developing and Using Computer-Generated Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 849.3.3. Specif icat ion Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84

10. DESIGN REFERENCES, STANDARDS, AND SPECIFICATIONS .. . . . . . . . . . . . . . . . . . . . . . . . . . 85

10.1. Dimensioning and Tolerancing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85

10.1.1. Dimensioning and Tolerancing Pract ices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85

10.1.2. Statements on Dimensioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85

10.2. Metric Dimensioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86

10.2.1. SI Units and Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86

10.2.2. Unit Conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89

10.2.2.1. Conversion of Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

10.2.2.2. Unit Rounding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89

10.3. Design References. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .92

10.4. Control of Surface Roughness. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93

10.4.1. Surface Texture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93

10.4.2. Surface Texture Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93

10.4.3. Surface Texture Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93

10.5. Thread Specif icat ions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93

10.6. Welding—Fusion and Resistance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .95

10.6.1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

10.6 .2 . Bas ic Weld Symbols and Thei r Locat ion S igni f icance . . . . . . .. . . . . .. . . . . . .. . . . . .. . . .95

10.7. Outgassing of Spacecraft Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

10.8. Standards and Specif icat ions Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

10.8.1. National Bureau of Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

10.8.2. Federal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96

10.8.3. Industr ial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97

10.8.4. Mil i tary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 8

10.8.5. NASA .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

10.9. Standards and Specif icat ions Numerical Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

APPENDIX A. DESIGN REVIEW DOs AND DON'Ts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

INDEX.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

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X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FL I GHT CENTER, Greenbe l t , M ary lan d

ENGINEERING DRAWING STANDARDS MANUAL 1

INTRODUCTION

This drawing standards manual establ ishes the conventions to be adhered to by

engineering and draft ing personnel in the preparat ion, revision, and complet ion of

engineering drawings. This manual sets forth the minimum requirements acceptable at

GSFC for the preparat ion of engineering drawings for f l ight hardware and groundsupport systems. The requirements specif ied herein are essent ial to the standardizat ion

of pract ices and to a uniform interpretat ion of drawings.

A system, payload, or component assembly shal l be completely defined by means of

drawings, including l is ts , schematics, wir ing diagrams, and specif icat ions, to ensure that

components fabricated are in accordance with the design. The documentat ion

information shal l serve as a permanent record.

Fl ight hardware shal l be fabricated in accordance with the approved design documents.

These documents shal l ref lect the characterist ics and acceptance cri ter ia for al l

materials , component/parts , subsystems, and the complete system. The acceptance

cri ter ia for parts and materials shal l be specif ied by standard specif icat ions when

applicable.

Engineering drawings are defined as those drawings that communicate the requirements

for the manufacture of the end-product i tems, their assembly, and their instal lat ion in the

end product .

The engineering drawings prepared by GSFC design personnel or contractors on GSFC

drawing format using GSFC drawing numbers shal l be known as “Government Design

Activi ty Drawings.” Parts made to these drawings typical ly would be manufactured

through the Fabricat ion Engineering Branch, Engineering Services Division, GSFC.

“Contractor Design Activi ty Drawings”””” (which are a company's drawings bearing the

company name, address, federal code ident if icat ion, and drawing number) should be used

when the company is designing and del ivering the f inished product in accordance with

the terms of a NASA contract .

The Design Activi ty shal l be defined as an act ivi ty having responsibi l i ty for the design

of an i tem or system. The act ivi ty may be a government ent i ty, a contractor , a vendor, or

another organizat ion such as a universi ty.

Although general ly in accordance with the Department of Defense and industry pract ices

and procedures, this drawing standards manual does contain specif ic differences and

exceptions to Engineering Drawing Prac t ices , MIL-STD-100E. This manual , while not

intended as a manual of instruct ion in the basic principles of draft ing, does set forth the

minimum requirements acceptable at the GSFC. One of those requirements is that

persons engaged in the prepara t ion of drawings shal l have a thorough unders tanding of

the fundamentals of draft ing and geometrical dimensioning and tolerancing ( in

accordance with ANSI Y14.5M-1982, Dimens ioning and Tolerancing) in order to produce in terpretable drawings .

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2 ENGINEERING DRAWING STANDA RDS MANUA L

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1. DRAWING ELEMENTS

1.1. Drawin g Sizes

The fol lowing table defines the standard drawing sizes, and their let ter

designat ions to be used at GSFC:

Notes:

(a) Lengths for “J” rol l s ize to be in l l - inch increments.

(b) Not inclusive of added protect ive margins of at least 2 inches on both ends of

rol l s ize drawings.

1.2. Mul t is heet Drawings

Multisheet drawings are permit ted in al l s izes.

a. The f i rst sheet of a mult isheet drawing shal l always contain the complete Ti t le

block, Lis t of Material , Revision Block, and genera l notes.

b . All sheets of mult isheet drawings shal l be of the same le t ter s ize. Use ofmult isheet drawings shal l be found to be advantageous for certain types of

schematics and diagrams.

c. The sheets of “J” size drawings may be any of the above-noted lengths and

may be intermixed in different lengths.

d. Sheet numbering for al l f i rst sheets shal l include the total number of sheets,

as “SHEET 1 OF 1,” “SHEET 1 OF 2,” etc. Numbering of continuat ion sheets

shal l be l imited to stat ing the specif ic sheet number (e.g. , “SHEET 2,”

“SHEET 3”) without specifying the total number of sheets.

Le t t e r

Des i gna t i on

Sheet Wi d t h

( i nches )

Sheet Leng t h

( i nches )

Marg i n

( i nches )

B 11 17 3/8

C 17 22 1/2

D 22 34 1/2

E 34 44 1/2

F 28 40 1/2

J 34 48 to 144(a) 1/2(b)

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1.3. Zoning

Vert ical and horizontal zoning may be used i f necessary to provide orientat ion to

the f ield of drawings. Zoning is mandatory for mult isheet drawings “D” size and

larger and single-sheet drawings “E” size and larger . Zones shal l be ident if ied by

alphabet ical (uppercase) and numerical entr ies in the margin spaces as indicated

in Figure 1. Zone sizes shal l be 8½ inches (width) by 11 inches ( length) for “E”and “J” size, 7 inches (width) by 10 inches ( length) for “F” size, and 5½ inches

(width) by 8½ inches ( length) for “D” size.

SECURITY NOTATION (IF REQUIRED)

SECURITY CLASSIFICATION

TITLE BLOCK

VERTICAL ZONE IDENTIFICATION

ALPHABETICALLY LETTERED

FROM BOTTOM EDGE

ALTERNATE

LOCATION OFGENERAL NOTES

REVISION NOTES

PREFERRED

LOCATION OF

GENERAL NOTES

HORIZONTAL ZONE

IDENTIFICATION NUMBERED

FROM RIGHT-HAND EDGE

SECURITY CLASSIFICATION

D R A W I N G N U M B E R

O N R E V E R S E

S I D E F O R R O L L - S I Z

E D R A W I N G S

A P P R O X . 2 - I N C H A D D I T I O N A L M A R G I N

F O R P R O T E C T I O N O F R O L L - S I Z E D R A W

I N G S

A P P R O X . 2 - I N C H A D D I T I O N A L M

A R G I N

F O R P R O T E C T I O N O F R O L L - S I Z E D R A W I N G S

D R A W I N G N U M B E R O N R E V E R S E

S I D E F O R R O L L - S I Z E D R A W I N

G S

2345

A

B

C

D

2345

A

B

C

D

1

1

Figure 1: Format for B, C, D, E, F, and J Size Drawings

1.4. T i t le Blo ck and Revis ion Blo ck

Tit le blocks and revision blocks shal l be prepared and completed as fol lows:

The Tit le block of single-sheet drawings, f i rst sheets of mult isheet drawings, and

revision blocks shal l appear as shown in ei ther Figure 2a on page 5 (dimensional

system/inches) or Figure 2b on page 6 (dimensional system/mil l imeters) . The

information required in the Tit le block shal l be as specif ied or referenced by

i tems 1 through 28, below. The Tit le block of continuat ion sheets for mult isheet

drawings shal l contain information l is ted in i tems 1, 2, and 4 through 11.

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20

11 10 9

21

8 6

22

5 4

1

3

23

2

24

24 25 26 27 28

71213

14 15 18 19

16

G DWT.CODE

SHSCALE

DRAWING INTERPRETED PER GSFC-X673-64-1

NAME INIT DATE

DESIGNER

CHECKED

APPROVED

APPROVED

APPROVED-STRESS

APPROVED-ENGINEER

UNLESS OTHERWISE SPECIFIED - DIMENSIONS ARE IN INCHES

TOLERANCES:

.XXX.XX

REMOVE ALL BURRS AND SHARP EDGES R .010 OR CHAMFER MAX.

NEXT ASSY USED ON

LIST OF MATERIAL

ITEM

NO

REQD REQD PART NO. DESCRIPTION MATERIAL MATERIAL SPEC & NO.

FRACTIONS125

±1/16

F O L D

L I N E

SYM DESCRIPTION DATE APPROVAL

REVISION

G D

FOLDLINE

GREENBELT, MARYLANDNATIONAL AERONAUTICS AND

SPACE ADMINISTRATIONGoddard Space Flight Center

FLIGHT HARDWARE/POST FAB HARDNESS TEST REQ'D

HARDNESS TEST NOT REQUIRED

TEST HARDNESS PER ASTM E-18, LOCATION OPTIONAL

TEST HARDNESS PER ASTM E-18 WHERE INDICATED

ON FIELD OF DRAWING THUS

NO NON-DESTRUCTIVE EXAMINATION (NDE) REQ'D

NDE REQUIRED PER S-313-009 CODE

THIS DRAWING WAS PRODUCED USING

SOFTWARE:

FILE NAME:

VERSION:

TITLE

±.02 ±.005 ±1°

DRAWN

ZONE

NON FLIGHT

REV

R E V

Figure 2a: Sample “Tit le and Revision Block” (Enlarged View)for Dimensional System/Inches

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SYM

REVISION

APPROVALDATEDESCRIPTIONZONE

F O L D

L I N E

WTCODE SHSCALE

DRAWING INTERPRETED PER GSFC-X673-64-1

NAME INIT DATE

DESIGNER

DRAWN

CHECKED

MECHANICALENGINEER

SYSTEMS ENGINEER

ELECTRICALENGINEER

NEXT ASSY USED ON

LIST OF MATERIAL

ITEM

NO

PART NO DESCRIPTION MATERIAL MATERIAL SPEC & NO

G D

NATIONAL AERONAUTICS ANDGREENBELT, MARYLANDGoddard Space Flight Center

NON-DESTRUCTIVE EXAMINATION (NDE) NOT REQD

NDE REQUIRED PER S-313-009 CODE

THIS DRAWING WAS PRODUCED USING

SOFTWARE:

FILE NAME:

VERSION:

TITLE

F O L D

L I N E

R EQ D R EQD

STRESS ENGINEER

TEST HARDNESS PER ASTM E-18 WHERE INDICATED

TEST HARDNESS PER ASTM E-18, LOCATION OPTIONAL

ON FIELD OF DRAWING THUS

HARDNESS TEST NOT REQUIRED

FLIGHT HARDWARE/POST FAB HARDNESS TEST REQ'D

G DREV

R E V

NON FLIGHTSPACE ADMINISTRATION

161918

17

1514

13 12 7

2827262524

24

2

23

3

1

45

22

68

21

91011

20 24

EDGES R 0.25 OR CHAMFER MAX

REMOVE ALL BURRS AND SHARP

THIRD ANGLE PROJECTION

UNLESS OTHERWISE SPECIFIED

DIMENSION ARE IN MM

DIMENSION TOLERANCES

RAD/CHAM

METRIC/INCH

ANGLE

2 DECIMAL

1 DECIMAL

DECIMAL

METERS

MICRO-

FINISH

3.2

IN

HYBRID

METRIC

±0.5

±1°

±0.25

±0.5

±1

Figure 2b: Sample “Tit le and Revision Block” (Enlarged View)for Dimensional System/Mil l imeters

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1 DRAWING NO.: See page 60.

2 “SH OF ”: Enter sheet number as applicable. Indicate total sheets only

on sheet 1.

3 WT: Enter uni t weight calculated at t ime of design i f required.

4 TITLE: See paragraph 2.1 on page 11 for select ion and arrangement of

drawing t i t le. See paragraph 3.3.2 on page 32 for drawing t i t le size.

5 SCALE: Enter scale. See paragraph 3.4 on page 32 for select ion of scale.

6 CODE: For drawings prepared by the Goddard Space Fl ight Center (GSFC)

with an off icial GSFC drawing number, enter the three-digi t GSFC code

identifying the group responsible for the drawing.

For drawings prepared by a contractor with a contractor drawing number and

format , the contractor 's code number from the Commercial and Government

Enti ty (CAGE) Publicat ion H4/H8(formerly Federal Supply Code for Manufacturers (FSCM) H4 and Federal Supply Codes for Non-Manufacturers

(FSCNM) H8) shal l appear.

7 DATE: Enter date of ini t ials .

8 DESIGNER: Enter designer 's printed name and ini t ials .

9 DRAWN: Enter draftsman's printed name or i f drawn by the designer, the

designer’s printed name may be repeated.

10 CHECKED: Enter design analyst 's printed name. This name shal l be an

independent name from al l other names on the drawing. I t represents that the

drawing has been checked against the parameters of this drawing manual and,where possible, to form, f i t , funct ion, and feasibi l i ty. The checker must have

a thorough understanding of the methods and pract ices of geometric

tolerancing and be able to specify such pract ices in accordance with ANSI

Standard Y14.5M-1982, Dimensioning and Tolerancing .

11 APPROVED: Enter the printed names of GSFC personnel assigned to approve

the drawing. Project requirements for drawing names shal l vary from program

to program, but each name shal l be ident if ied. For example, af ter each

approval name, note the fol lowing: “ENG” for engineer , “STRESS” for st ress

engineer , “QA” for qual i ty assurance engineer , “MATL” for materials

engineer , “ELEC” for electr ical engineer , etc. All names in l ine i tems 8

through 11 must be legible. The hand-wri t ten ini t ials on the paper original

are the off icial approval of that document .

12 USED ON: Enter acronym name of program and acronym name of subsystem

or experiment where applicable.

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13 NEXT ASSY: Enter drawing number on which the part is next ut i l ized,

modified, or assembled. In the case of tool ing drawings, in the Next

Assembly block refer to a general note that s tates “This drawing is used to

fabricate (drawing number) .” Instal lat ion drawings should ref lect a top

configurat ion drawing number as the next assembly. When a configurat ion

drawing is not being produced, the instal lat ion drawing shal l indicate by note

“The instal lat ion forms a part of the configurat ion for program (projectname).”

14 EXAMINATION: The appropriate “Non-Destruct ive Examinat ion (NDE)

Required” block shal l be checked off , and the addit ion of the applicable code

or “see note XX” shal l be added where required. Refer to Test ing and

Inspect ion Notes of the general notes sect ion paragraph 2.4.4.6 on page 20.

15 FLIGHT HARDWARE and HARDNESS TESTING: The Fl ight Hardware block

must be checked off when the part is used in actual f l ight configurat ions. The

appropriate Hardness Test ing block shal l be checked off regardless of whether

the part is f l ight hardware or not .

16 On CAD-produced drawings, add a 3.5-inch-long by 0.88-inch-high block asfol lows:

THIS DRAWING WAS PRODUCED USING:

SOFTWA RE: (a) VERSION : (b)

FILENAME: (c)

Notes :

(a) Software used (example: “AUTOCAD”)(b) Version of software (example: “10c7”)

(c) Fi lename (example: “GSFC1234”)

17 METRIC/HYBRID METRIC-INCH: Add “X” to type of drawing block.AAAA

18 ITEM NO.: Enter i tem numbers when more than one type of material or part is

required, and coordinate drawing cal louts on the drawing f ield. Parts made of

the same material , condit ion, and specif icat ion shal l be assigned only one i tem

number, even though the part may be required in various sizes and

thicknesses. The quanti ty for such i tems in the List of Material (L/M) shal l be

stated as “A/R” with the specif ic sizes spel led out in the f ield of the drawing.

Refer to Figure 3 on page 10, Figure 34 on page 80, and Sect ion 8.6, Find or

I tem Number System of Ident if icat ion, on page 79. Do not skip i tem numberson new drawings.

19 REQD: Enter quanti ty of parts required only for the parts of an inseparable

assembly or assembly drawing.

20 PART NO.: Enter ident ifying part numbers when required (Government ,

contractor , vendor, or other) . On new drawings, group l ike i tems together .

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21 DESCRIPTION: Enter material descript ion (plate, etc. ) or a part name t i t le i f

i t is another drawing. Enclose reference information such as fastener sizes in

brackets.

22 MATERIAL: Enter the material from which the part is fabricated. Examples:

“AL ALY”; “CRES”; “BE CU.”

23 MATERIAL SPEC.: Enter the applicable material specif icat ions, number, and

final condit ion. Examples: “QQ-A-250/11 6061-T6” for AL ALY plate;

“ASTM A582 303 COND A” for CRES bar.

The information required in the revision block shal l be as specif ied or

referenced by i tems 24 through 28, below, and in accordance with “Drawing

Revisions,” paragraph 7, page 68.

24 REVISIONS - SYM: Enter revision symbol.

25 REVISIONS - ZONE: Enter zone (where used).

26 REVISIONS - DESCRIPTION: Enter descript ion of the revision (refer toSect ion 7, “Drawing Revisions”) .

27 REVISIONS - DATE: Enter date approved by authorized signer(s) in block.

28 REVISIONS - APPROVAL: Enter signature of GSFC person assigned to

approve. If change was by approved EO, drawing only needs approval of the

draftsman or person incorporat ing the change, and the checker. If changes

made are not covered by an EO, then approval must include the engineer .

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DETAIL DRAWING

INSEPARABLE ASSEMBLY DRAWING

ASSEMBLY DRAWING

INSEPARABLE ASSEMBLY DRAWING

DETAIL SHOWN & OPPOSITE DRAWING

PART NO.REQDITEM

NO.DESCRIPTION MATERIAL MATERIAL SPEC & NO.

WIRE BE CU QQ-C-530, COND 1/2 HT

PART NO.REQDITEM


1

2 MS21209C0415

PLATE

INSERT (4-40 UNC x .168 LG)

AL ALY

SEE NOTE 1

QQ-A-250/11 6061-T61

2

PART NO.REQDITEM


QQ-A-225/8 6061-T6

QQ-A-225/8 6061-T6

AL ALY

AL ALYBAR OPPOSITE

BAR SHOWN-1

-2

PART NO.REQDITEM


1

2

PLATE

INSERT (4-40 UNC x .168 LG)

AL ALY

SEE NOTE 1

QQ-A-250/11 6061-T6

MS21209C0415

GD1000001 PLATE ASSY

A/R

3

PART NO.REQDITEM


1

2

3

REQD

3

3

1

2

1

2

MS51957-12

GD1003451

GC1003467-2

GC1003467-1

GE1002500-2

GE1002500-1

4 SCREW (4-40 UNC 2A x .187 LENGTH)

BLOCK

PLATE

PADDLE ASSEMBLY OPPOSITE

PADDLE ASSEMBLY SHOWN

PLATE

CRES

Notes:

(a) Paint , adhesive s, and protect ive coat i ngs shall appea r in note form.(b) Hardware shall app ear in List of Mater ial with requi red quant ity.(c) “A/R” shall be used in REQD column when same mater ial (same mater ial

speci f icat ion and condi t ion) appears more than once in d i f ferent s izes inthe f ield of the drawing.

(d) “A/R” may be used to indicate large qu ant it ies of r ivets.(e) A mater ial specif i cat ion shall onl y appear once in the List of Mater ial

unless mater ial condit ions vary or a Shown and Opposite part isrequired. Sheet and plate shall not be l is ted as separate i tems.

Figure 3: Examples of “List of Mater ial”

1.5. Drawing Format

The drawing format for the drawing sizes l is ted on page 3, including zoning,

drawing numbers, securi ty classif icat ion, etc. , is shown in Figure 1, page 4.

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2. NOMENCLATURE

2.1. Drawin g Ti t l e

General information for the select ion or development of a drawing t i t le is as

fol lows:

a. The t i t le should be as brief as possible but should contain suff icient

information to categorize the part properly and to dist inguish i t f rom other

similar parts .

b . The drawing t it le shal l cons ist of the fol lowing:

1. Ident ifying noun or noun phrase.

2. The most signif icant modifier or modifying phrase.

3. The next most signif icant modifier or modifying phrase.

The noun or noun phrase establ ishes a basic concept of an i tem. The

modifiers serve to narrow the area of concept establ ished by the basic name.

A modifier is separated from the noun or noun phrase by a comma and from

any preceding modifier by a comma. The type designator and/or any

addit ional modifiers required to further ident ify an i tem are separated from

the f i rst part of the t i t le by a dash. Where applicable, the word “ASSEMBLY”

shal l be used as the last word of the noun phrase.

EXAMPLES:

“Beam, Hoist ing, Guided Missi le”

“Cover, Protect ive, Rocket M otor—Forward Sect ion”

“Cabinet , Electr ical Equipment—CY-147”

“Transportat ion—Dolly Assembly, Earth Satel l i te”

c. The noun, or noun phrase, is never abbreviated. Abbreviat ions are used in the

modifiers only when space is l imited. When used, abbreviat ions shal l conform

to Abbreviat ions, paragraph 2.2 on page 12.

d. When one drawing supersedes another , the new drawing, when pract ical , has

the same t i t le.

e. Parentheses are not used to enclose any port ion of the drawing t i t le.

f . Program names (or abbreviat ions) should be added to the “Used On” block and

not the Tit le block; exceptions are on the f inal or top assembly drawing.

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2.2. Abbrev iat ions

The purpose of this sect ion is to provide a l is t of authorized abbreviat ions for use

on drawings and associated documents. When used, abbreviat ions and acronyms

shal l be in accordance with GSFC STD-256-WE-1 and MIL-STD-12 ( in that order

of precedence).

a. Uppercase Gothic let ters shal l be used.

b . Abbreviat ions for word combinat ions (e .g. , MMC—Max imum Materia l

Condit ion) shal l be used as such and shal l not be separated for use singly.

Single abbreviat ions may be combined when necessary.

c. The same abbreviat ion shal l be used for al l tenses, the possessive case and the

singular and plural forms of a given word.

d. Abbreviat ions should be used only to save space or t ime, but never at the

expense of clar i ty.

e. Periods shal l be used with abbreviat ions that spel l ent i re words to provide

clari ty and to avoid misinterpretat ion.

The fol lowing abbreviat ions are acceptable to use and are “industry-related”

associat ions not found in GSFC STD-256-WE-1 or MIL-STD-12.

AFBMA Anti-Frict ion Bearing Manufacturers Associat ion, Inc.

1101 Connect icut Avenue, NW

Suite 700

Washington, DC 20036

AGMA American Gear Manufacturers Associat ion, Inc.

1500 King Street

Suite 201

Arl ington, VA 22314

ANSI American National Standard Inst i tute

1430 Broadway

New York, NY 10018

ASME American Society of Mechanical Engineers

345 E. 47th Street New York, NY 10017

ASTM American Society for Test ing and Materials

1916 Race Street

Philadelphia, PA 19103

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AWS American Welding Society, Inc.

550 N.W. Ledeune Road

P.O. Box 351040

Miami, FL 33135

IEEE Inst i tute of Electr ical and Electronic Engineers, Inc.445 Hose Lane

P.O. Box 1331

Piscataway, NJ 08855-1331

ISO Internat ional Organizat ion for Standardizat ion/

(Organisat ion Internat ionale de Normalisat ion)

1, rue de Varembé

1211 Geneve 20

Switzerland/Suisse

NEMA National Electr ica l Manufacturers Associat ion2101 L Street , NW


NSA National Standards Associa tion, Inc .

1200 Quince Orchard Blvd

Gaithersburg, MD 20878

NAS Aerospace Indus tr ies Associa t ion of America, Inc.

1250 I Street , NW


SAE Society of Automotive Engineers, Inc.

400 Commonwealth Drive

Warrendale, PA 15096

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2.3. L is t of Mater ia l

2.3 .1 . Requi r ements on the Body o f the Drawing

Each part l is ted in the List of M aterial (Parts List) must be

ident if ied at least once by an I tem (Find) Number on the body of

the drawing (except single i tem drawings and shown and opposi te

i tem drawings) .

Note:

Parts shal l be bracketed, indicat ing reference, when they are

ident if ied by number and are not noted in the List of Material .

Such parts are shown in phantom. Repeated i tem numbers shal l be

indicated as reference ei ther within brackets or by the word “REF.”

2.3 .2 . Requi r ements in the L is t o f Mater ia l

a. The List of Material is a l is t of al l parts and materials cal ledout on the drawing. See Figure 3 on page 10.

b. The quanti ty of par ts noted in the Lis t of Materia l is the number

required to complete the noted assembly.

c. When a new drawing is made, al l parts in the List of Material

should be grouped as to type, such as dash number (for shown

and opposi te assemblies) , GSFC drawings (for detai led parts) ,

MS parts , NAS parts , etc. , and l is ted in this sequence.

d. Quanti t ies of Bulk I tems and placement: refer to notes (a)

through (e) on Figure 3 on page 10.

e. Preferred parts l is ts for parts , materials , and processes can be

found in an unofficial publicat ion avai lable for viewing in the

Mechanical Engineering Branch. The “Design Select ion Guide”

contains a wide range of hardware, materials , design standards,

and processes. I t shal l be noted that not al l of the i tems in this

reference guide are rated for space f l ight use.

Note:

All fasteners used in f l ight hardware and cri t ical nuts and bol ts

used on ground support equipment , including al l f l ight /GSE

interfaces, must meet the specif icat ion GSFC Fastener Integri ty

Requirements , GSFC S-313-100, Materials Branch, Office ofFl ight Assurance.

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2.4. Notes on Drawings

Information other than pictorial views and dimensions necessary for complet ing a

drawing is classif ied as “notes.” The two types of note forms are General Notes

and Local Character Notes. Notes on a drawing take precedence over

specif icat ion requirements; hence, notes confl ict ing with referencedspecif icat ions shal l not be placed on a drawing unless they are necessary for

deviat ions from certain provisions of the specif icat ion.

2.4 .1 . Secur i ty C lass i f ic a t ion

The securi ty classif icat ion “Top Secret ,” “Secret ,” or

“Confident ial” shal l be located on the drawing as noted in Figure 1

on page 4 .

Each sheet of a mult isheet drawing shal l be individual ly classif ied

as to i ts contents. The securi ty stamp on each sheet shal l be that of

the highest classif icat ion for any i tem shown on that individual

sheet , not the general overal l classif icat ion of the ent ire set ofdrawings or the end i tem. On rol l -size drawings, the securi ty

classif icat ion shal l be shown on the reverse side at both ends of the

drawings next to the drawing number to enable the classif icat ion to

be seen without unrol l ing the drawing.

A warning note shal l be included adjacent to the securi ty

classif icat ion located above the Tit le block and shal l read as

fol lows:

THIS MATERIAL CONTAINS INFORMATION AFFECTING THE NATIONAL DEFENSE OF THEUNITED STATES WITHIN THE MEANING OF THE

ESPIONAGE LAWS, TITLE 18 U.S.C., SECTIONS 793 AND 794. THE TRANSMISSION OR REVELATION OFWHICH IN ANY MANNER TO AN UNAUTHORIZEDPERSON IS PROHIBITED BY LAW.

2.4.2. Note Loc at io n

Notes of general character that do not require leaders to indicate

where they apply, and for which provision has not been made in the

supplementary blocks of the drawing format , shal l be located in the

fol lowing order of preference:

a. Adjacent to the upper lef t border and to the lef t of al l views.

b. Immedia tely to the lef t of the revision block.

c. Adjacent to the lower lef t border or below the revision block,

space being lef t for extending the revision block downward.

This locat ion should be avoided whenever pract ical because the

space required for revisions cannot be ant icipated.

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2.4.3. Numb er in g of Notes

General notes are numbered consecutively downward. Note

numbers may be ident if ied on the f ield of the drawing by placing

the note number in a pennant-shaped f lag at the general note

locat ion and in the f ield of the drawing, or in the List of Material

(Material Specif icat ion column), whichever locat ion is moreappropriate.

2.4.4. Note Exampl es

The fol lowing notes are l is ted as representat ive examples and

should be used on Engineering Drawings when applicable.

Signif icant information is to be inserted where blank(s) are

indicated and, for most cases, the notat ions in parentheses are for

information only. (When not applicable, do not use in note) .

Before using the referenced specif icat ions, check the Department of

Defense Index of Spec i f ica t ions and Standards Publ ica t ions toensure that the specif icat ion has not been cancel led or superseded.

Use ei ther of the fol lowing statements as main heading for notes:

“Except as noted” or “Unless otherwise specif ied.”

2.4.4.1. Dimens io n Notes

ALL DIMENSIONS APPLY AFTER SURFACETREATMENT.

DIMENSIONAL LIMITS AND SURFACE ROUGHNESSDESIGNATIONS APPLY (state “BEFORE” or

“AFTER”) PLATING.( F or ot her c oat i ngs , s ubs t i t ut e t heappr opr i at e expr es s i on f or “ pl at i ng. ” )

DIMENSIONS TO APPLY AFTER STRESS RELIEF.

DIMENSIONING AND TOLERANCING TO BEINTERPRETED IN ACCORDANCE WITH ANSIY14.5M-1982.(Note need be added only when drawingsare not in compliance withGSFC X-673-64-1F.)

GEAR TOLERANCES TO BE IN ACCORDANCE WITH AGMA STANDARD QUALITY (insert number) .

DIMENSIONS ARE IN MILLIMETERS.

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TOOLING-CONTROLLED DIMENSION PERTEMPLATE (or “TOOL”) NUMBER GX XXXXXXX. THE

ACTUAL TOLERANCES ON THE FEATURE'SLOCATIONS ARE CONTROLLED BY THE TEMPLATE.(Note to be flagged to tooling-affected dimensions and tolerances,

which are then enclosed in parentheses

to indicate a reference; templatedrawings shall carry a note statingthe drawing number of the part theyare used to fabricate.)

TORQUE LIMITS FOR THREADED FASTENERSSHALL BE IN ACCORDANCE WITH PROJECT

APPROVED SPECIFICATION NUMBER (ORENGINEERING ANALYSIS).

2.4.4.2. Heat Treat ing Notes

Note for beryl l ium copper:

HEAT TREAT IN ACCORDANCE WITH MIL-H-7199 TO(Brinel l) .

Note for steel :

HEAT TREAT IN ACCORDANCE WITH MIL-H-6875 TOXXX.

( XXX = “ Roc kwel l , ” “ Br i nel l , ” o rVi c ker s ” ) .

Notes for aluminum:

HEAT TREAT IN ACCORDANCE WITH MIL-H-6088 TO(Brinel l) .

HEAT TREAT TO CONDITION AFTER(insert “BRAZING” or “WELDING”) IN

ACCORDANCE WITH MIL-H-6088.

AFTER WELDING, SOLUTION HEAT TREAT AND ARTIFICIALLY AGE TO T-6 CONDITION PERMIL-H-6088.

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2.4.4 .3 . Jo in ing Method Notes (weld ing, braz ing, e tc . )

The fol lowing specif icat ion supersedes MIL-W-8604 for Alum.;

MIL-W-8611A for Steel , CRES, and HT RES ALY; and

MIL-W-18326 for Magnesium:

FUSION WELD IN ACCORDANCE WITHMIL-STD-2219, PROCESS CLASSUSING FILLER METAL AND APPROPRIATEFLUX.(Joint dimension and design should bespecified on the drawing.)

ELECTRON BEAM WELDING IN ACCORDANCE WITHMIL-W-46132.

SOLDER IN ACCORDANCE WITH NHB 5300.4(3A–1),USING SOLDER MATERIAL, QQ-S-571, TYPE .

SOLDER IN ACCORDANCE WITH DOD-STD-1866(GENERAL SOLDERING PROCESS FOR ALL TYPES

AND MATERIALS FOR NONELECTRICAL APPLICATIONS).

Note for aluminum:

DIP BRAZE IN ACCORDANCE WITH MIL-STD-645;HEAT TREAT TO CONDITION PERMIL-H-6088.

SILVER SOLDER IN ACCORDANCE WITHMIL-B-7883, TYPE GRADE USING

SOLDER MATERIAL QQ-B-654, CLASS .

RIVET IN ACCORDANCE WITH MIL-STD-403.

2.4.4.4. Plat in g and Coat in g Notes

Plat ing notes are general ly not for space f l ight hardware use in

restr icted areas such as opt ics, electronics, etc. , due to f laking.

CADMIUM PLATE IN ACCORDANCE WITH QQ-P-416,TYPE CLASS .

HARD CHROME PLATE ( s i z e) —( s i z e) THICK PERQQ-C-320, TYPE , CLASS ; DIMENSIONSSHOWN APPLY AFTER PLATING.

NICKEL PLATE IN ACCORDANCE WITH MIL-STD-171,FINISH ( par a. number ) , TYPE .

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SILVER PLATE IN ACCORDANCE WITH QQ-S-365,TYPE , GRADE .

PAINT IN ACCORDANCE WITH MIL-STD-171, TABLE; FINISH NO. COLOR IN

ACCORDANCE WITH FED-STD-595 (color

number).

Notes for aluminum:

ANODIZE IN ACCORDANCE WITH MIL-A-8625, TYPE, CLASS COLOR

(name of color only ) .

IRIDITE IN ACCORDANCE WITH MIL-C-5541,CLASS .

Note for CRES:

PASSIVATE PER QQ-P-35, TYPE .

FINISH OF MIL-STD-171.Use paragraph that applies to materialbeing used.

Note for i ron and stee l :

APPLY PROTECTIVE PHOSPHATE COATING IN ACCORDANCE WITH MIL-C-12968, TYPE .

( Add “ CL ASS ” i f appl i c abl e. )

Note for t i tanium:

SURFACE FINISH TO BE IN ACCORDANCE WITH AMS 2488, TYPE .

2.4.4.5. Surf ace Preparat io n Notes

SURFACE TO BE CLEANED AND POLISHED FORVACUUM USE. DO NOT USE ROUGE COMPOUNDSOR CHEMICALS DURING BUFFING OR POLISHINGON ITEMS REQUIRING TANK-TYPE LEAK TESTS.

EXTERNAL SURFACE TO BE BUFFED TO .

BEFORE ELECTROPOLISHING, MASK ALL

SURFACES MARKED .

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VAPOR DEGREASING PER ASTM D4126, GENERALSOLVENT GRADE 1,1,1 TRICHLOROETHANE.

2.4.4.6. Test in g and Insp ect i on Notes

THIS PART SHALL HAVE A LEAK RATE OF NOT

MORE THAN (1 x 10 -7 CC/SEC OF HELIUM) WHENMEASURED BY A CALIBRATED MASSSPECTROMETER HAVING A SENSITIVITY OF

(1 x 10 -9 CC/SEC WITH GREATER THAN 90%HELIUM) AT A DIFFERENTIAL OF (ONE)

ATMOSPHERE OR EQUIVALENT TEST.

RADIOGRAPHIC INSPECTION OF ALL WELDS IN ACCORDANCE WITH MIL-STD-00453.

ULTRASONIC INSPECTION PER MIL-STD-2154,TYPE ( I ns er t “ I ” or “ I I ” ) , CLASS .

( I = I mmer s i on Met hod, I I = Cont actMet hod. )

For General Fracture Control Plan for Payloads Using the Space

Transportat ion System (STS), refer to GSFC 731-0005-83. One of

the fol lowing notes should be used for parts requir ing etching

and/or l iquid penetrant inspect ion:

FRACTURE CRITICAL PART - ETCH ANDPENETRANT INSPECT PER GSFC S-313-009,CODE XXXXX.(Usually used for machined parts.)

FRACTURE CRITICAL PART - DO NOT ETCH PART.PENETRANT INSPECT PER GSFC S-313-009,CODE XXXXX.(Usually used for rolled parts.)

If areas of a part are to be etched and inspected prior to f inish

machining, a separate drawing note should cal l out this requirement

to avoid cost ly mistakes.

2.4.4.7. Threaded Insert s — Cleaning and Inst a l lat i onNotes

Note for aluminum and magnetic surfaces:CLEAN THREADED INSERTS WITHTRICHLOROETHANE AND BAKE OUT AT 100DEGREES CELSIUS FOR 3 TO 4 HOURS PRIOR TOINSTALLATION. APPLY DRY FILM LUBRICANTGOVT. DESIGNATION M-6003, TYPE ( i ns er t“ I ” or “ I I ” ) PER MIL-L-46010 QPL (LIST).( Type I cur e t emp. = 150 degr ees C. )( Type I I cur e t emp. = 240 degrees C. )

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INSTALL THREADED INSERTS PER XXX.( XXX = “MS33537” f o r co i l t ype ,“MS51835” f or Keen t ype, or“ MI L - I - 45932/ 1” f or t hi n wal l t ype. )

INSTALL CLINCH NUTS PER MIL-N-45938/1.

AFTER THE BONDING EPOXY IS CURED PER NOTE, ALL ITEM (insert number)

THREADED INSERTS SHALL BE CAPABLE OFWITHSTANDING A CORRESPONDING TORQUELOAD, AS LISTED IN TORQUE TABLE, WITHOUTBECOMING LOOSE. ALL THREADS ON THREADEDFASTENERS SHALL BE FREE OF ADHESIVE ANDFOREIGN MATERIAL.

TORQUE TABLE

THREAD SIZE TORQUE, IN-LBS

6-32 UNC x.x

. . . . . .

. . . . . .

TAP ALL HOLES PRIOR TO COATING; INSTALLTHREADED INSERT AFTER COATING.

2.4.4.8. Misc el laneou s Notes

PLACE IN BAG AFTER FINAL ELECTROPOLISHING.BAG SHALL CONFORM TO MIL-P-116, METHOD (seespec.).

ALTERED PART SOURCE INFORMATION:PART NO.:VENDOR:

ADDRESS:

MAINTAIN AS MATCHED SET AFTER MACHINING.

Note for NON-fl ight parts ONLY:

STEEL STAMP, ETCH, OR ENGRAVE (s ize) HIGH

CHARACTER AS SHOWN, X .010+.005 - .000

DEEP.

THIS DRAWING TO BE INTERPRETED IN ACCORDANCE WITH GSFC X-673-64-1F.

RUBBER STAMP (size) HIGH CHARACTER ASSHOWN, USING ( insert “ INK” or “PAINT”) IN

ACCORDANCE WITH (speci f icat ion *) .(* Include manufacturer's part numberand address.)

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BAG PART PER MIL-P-116, METHOD , ANDTAG WITH PART NUMBER.”

ALTERED SURFACES TO HAVE .

(Refer to paragraph 10.4.1, page 93, forsymbol notation.)

FINISH ALL OVER.

(Refer to paragraph 10.4.1, page 93, forsymbol notation.)

SURFACE ROUGHNESS AS XXX:

MACHINED SURFACES .( wher e XXX i s “ ROLL ED, ” “ EXTRUDED, ” or“ DRAWN” ) .( Ref er t o par agr aph 10. 4. 1, page 93, f o r

s y mbol no t at i o n. )

INSIDE CORNERS R MAXIMUM.

UNIT TO BE STRAIGHTENED AND STRESS-RELIEVED AFTER WELDING.

WELDED OR BRAZED FILLETS TO BE CONFINED TOINSIDE SURFACE.

TWINE SHALL CONFORM TO THE REQUIREMENTSOF MIL-T-713, TYPE , CLASS .

A MANUFACTURER'S CERTIFICATION OF MATERIALSPECIFICATION COMPLIANCE MUST BE SUPPLIEDWITH PART (insert number) .

MAGNETIC SPECIFICATION--PERMEABILITY OFLESS THAN (specify units) .

COMPONENTS MUST BE PACKAGED AND MARKEDIN ACCORDANCE WITH APPLICABLE INTERSTATECOMMERCE COMMISSION (ICC) REGULATION49-CFR71-78; SHIPMENT SHALL BE MADEDIRECTLY TO THE USING AGENCY. EXPLOSIVE (or other applicable wording) COMPONENTS

ARE HAZARDOUS AND MUST BE HANDLED IN ACCORDANCE WITH APPLICABLE SAFETYREGULATION 49-CFR71-78.

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2.4.4.9. Info rm at io nal Notes

Informational notes, such as the fol lowing government r ights to

manufacture note, shal l appear adjacent to the r ight border and

Tit le block of the drawing:

THE XXXX COMPANY, CHICAGO, IL. , PARTNUMBER XXXX CORRESPONDS TO THE ITEMDEPICTED ON THIS DRAWING, WHICH ISFURNISHED FOR UNRESTRICTED USE INCONNECTION WITH ANY U.S. GOVERNMENTMANUFACTURE OR PROCUREMENT. SUCH USE IS

AUTHORIZED BY THE XXX COMPANY LETTER NO.XXX SIGNED AND DATED

. NO OTHER USE IS AUTHORIZED.

2.4.5. Loc al Character Notes

Notes of local character , such as dri l l notes , thread notes, e tc. , that

require leaders to indicate the features to which they apply, shal l

be located in the f ield of the drawing in posi t ions adjacent to such

features. Each note shal l s tate the number of features to which i t

appl ies unless a leader is drawn to each feature.

2.4.6. General Dimens io nal Toleranc e Notes

The general tolerances entered in the supplementary port ion of the

Tit le block shal l control al l dimensions applied to the drawing,

except those specif ical ly labeled “Max,” “Min,” “Ref,” “Datum,” or

“Basic,” or dimensions having tolerances applied direct ly thereto,

or dimensions control led by notes or documents invoked on the

drawing. General tolerances may be changed to the prevalent

tolerances that are required by the drawing type. This is done bystr iking through the tolerance and insert ing the new tolerance

beneath the old. In the case where metr ic to lerancing is required,

see Sect ion 10.2, subparagraph i , for general tolerances.

2.5. Speci f icat i on Cal lo uts

Normally, only the basic document number of a specif icat ion should be shown on

the drawing, in which case, the latest issue in effect at the t ime of invi tat ion to

bid shal l be imposed in al l procurement ac t ions. Changes to the specif ica t ion

occurring subsequent to the t ime of invi tat ion to bid shal l not be imposed in

current procurement act ions unless the drawing is revised to show the new issue

by basic document number, revisions , amendment , and/or date and cur rent pro-

curement act ions amended to specify the new drawing revision or EngineeringOrder (EO).

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If the basic document number, revision, amendment , and/or date of a specif icat ion

are shown on a drawing, only that part icular issue shal l be imposed in al l

procurement ac tions . Changes to the specif ica tion occurring subsequent to the

t ime of invi tat ion to bid shal l not be imposed in ei ther current or future

procurement ac tions unless the drawing is revised to show the new issue by basic

document number, revision, amendment , and/or date and current procurement

act ions amended to specify the new drawing revision or EO.

Regardless of whether a specif icat ion is shown on the drawing by basic document

number only or by a part icular issue, superseding specif icat ions (new number)

shal l not be imposed in ei ther current or future procurement act ions unless the

drawing is revised to show the new basic document number and, i f appl icable,

issue and current procurement act ions amended to specify the new drawing

revision or EO.

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3. DRAFTING PRACTICES

3.1. General

These draft ing pract ices are to be employed in the preparat ion of drawings by

GSFC personnel to achieve commonali ty throughout and resul t in legible

reproduct ions at the least cost from original drawings.

Drawings must be complete and unambiguous in interpretat ion. Complete

drawings contain or make reference to al l data necessary for fabricat ing and

instal l ing the part and, when applicable, the necessary test requirements,

procurement requirements, and source .

Third-angle orthographic project ion shal l be used for mechanical engineering

drawings. (Certain diagrams, schematics, etc. , are excepted.) Although other

types of project ion, such as isometric, perspect ive, etc. , are not prohibi ted, their

use must be confined to an auxil iary view on a drawing of a complex part when

such a view shal l aid in visual izing the part .

Drawings need not have three views, ( i .e . , one or two views are permissible for

objects that can be completely defined). Complementary notes or dimensions are

acceptable in place of the addit ional views. The rule shal l be that only those

views shal l be drawn that are necessary to convey the required characterist ics of

the part . Views, dimensions, etc. , shal l not extend into the margins of the

drawing.

3.2. Lines

Acceptable qual i ty of reproduct ions is dependent on the densi ty and uniformity of

l ine work (and let ter ing). Types of l ines described herein are merely l ine conven-

t ions, but in every case, each type of l ine shal l be opaque and of uniform widthand shal l be used on al l drawings other than diagrams, such as schematics, etc.

3.2 .1 . Ink L ines and P lo t ted L ines

Lines, whether hand-drawn or plot ted, shal l be opaque and of

uniform width for each type of l ine. Two widths of l ines, i .e . , thin

and thick, with their widths in the proport ions of 1:2, shal l be used.

The actual width of each type of l ine shal l be governed by the size

and style of the drawing; the relat ive widths of the l ines shal l

approximate those shown in Figure 4 on page 26.

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Figure 4: L ine Types and Convent ions

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3.2.2. Penci l L i nes

Pencil l ines shal l be opaque and of uniform width throughout their

length.

The l ine widths which are specif ied for ink l ines do not apply to

penci l l ines. Cutt ing and viewing plane l ines are the thickest l ineson the drawing. However, the thick l ines used for out l ines and

other visible l ines shal l be suff icient ly prominent to immediately

different iate them from l ines used for other purposes. Hidden,

sect ioning, center , phantom, extension, dimension, and leader l ines

shal l be thinner than out l ines. In select ing the widths of penci l

l ines, considerat ion shal l be given to the medium of reproduct ion

involved to ensure proper reproduct ion and reduct ion of the thinner

l ines.

3.2.3. Types of L in es

3.2.3.1. Center L i nes

Center l ines shal l be composed of long and short dashes, al ternately

and evenly spaced, with a long dash at each end. Center l ines shal l

cross without voids. See Figure 5, below, and Figure 6, page 28.

Figure 5: L ine Convent ions

Very short center l ines may be unbroken if there is no confusion

with other l ines. Center l ines shal l also be used to indicate the

travel of a center . See Figure 6 on page 28.

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Figure 6: Alternate Posit ion

3.2.3.2. Dimens io n Lin es

Dimension l ines shal l terminate in arrowheads at each end. They

shal l be unbroken except where space is required for the dimension.

The proper method of showing dimensions and tolerances is

explained in Sect ion 1.7 of ANSI Y14.5M-1982.

3.2.3.3. Leaders

Leaders shal l be used to indicate a part or port ion to which a

number, note, or other reference applies and shal l be an unbroken

line terminat ing in an arrowhead, dot , or wavy l ine. Arrowheads

should always terminate at a l ine; dots should be within the out l ine

of an object .

3.2.3.4. Break Li nes

Short breaks shal l be indicated by sol id freehand l ines. For long

breaks, fu l l ru led l ines with freehand zigzags

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