ansi b 16.11

7-1

Socket Weld and Threaded Fittings

Aalco Tel. 01932 250100 Fax: 01932 250101 E-mail: [email protected]

Section 7


This Section contains dimension and tolerance informationextracted from American and British specifications applicableto socket weld and threaded fittings.

Subsections and topics PageHigh Pressure Fittings - General 7-2Pressure/Temperature Ratings - BS 3799 7-4Socket Weld Fittings - ANSI/ASME B16.11/BS 3799 7-6Threaded Fittings - ANSI/ASME B16.11/BS 3799 7-11Plugs and Bushings - ANSI B16.11/BS 3799 7-13Hexagonal and Round Nipples - BS 3799 7-14Welding Bosses - BS 3799 7-15Threaded Unions - BS 3799 7-16Swage Nipples - BS 3799 7-18

Outlets 7-19 to 7-25

Low Pressure Threaded Fittings - General 7-26Equal Elbows, Tees and Crosses - BS 1740 7-27 Sockets - BS 1740 7-31Caps and Plugs - BS 1740 7-33Hexagonal Bushes and Nipples - BS 1740 7-34

ASME/ANSI and BS Specifications covered in this Section Page

ANSI/ASME B16.11-1991 - Forged Fittings, Socket-welding and Threaded 7-2

BS 3799:1974 - Steel Pipe Fittings, Screwed and Socket-welding for the Petroleum Industry 7-2

BS 1740:Part 1:1971 Wrought Steel Pipe Fittings (screwed BSP thread) 7-26

7-2



High Pressure Fittings - GeneralThis subsection summarises requirements for high pressure (HP) socket weld andthreaded fittings as defined in ASME/ANSI B16.11-1991 and BS 3799:1974. Dimensionsare reproduced in pages 7-6 to 7-25, including coverage of Outlet fittings that are alsoused in high pressure applications.

SpecificationsThe specifications applicable to high pressure socket weld and threaded fittings are as follows:

❍ ASME/ANSI B16.11-1991 - Forged fittings,socket-welding and threaded.

❍ BS 3799:1974 - Steel pipe fittings, screwed andsocket-welding for the petroleum industry. Thisspecification is substantially the same as B16.11.

A summary of the fittings, sizes and pressureratings (class designations) covered by B16.11and BS 3799 is provided in the tables below. Thefirst table also shows the pipe weights defined ascompatible with the various classes of fitting.

Class designations in B16.11-1991 and BS 3799:1974

Notes1 Class designations correspond to the maximum cold working pressure of fittings in pounds force per square inch.2 The wall thicknesses quoted are not restrictive but do correlate for calculation of pressure ratings. Thicker or thinner pipe

may be used, but when thinner pipe is used its strength should govern the pressure rating.3 Bore dimensions for Class 3000 lb socket welding fittings correspond to Schedule 40 pipe.4 Bore dimensions for Class 6000 lb socket welding fittings correspond to Schedule 160 pipe.

Summary of coverage provided by B16.11-1991 and BS 3799:1974

Notes1 Plugs and bushes are not designated by Class and may be used for ratings up to Class 6000 lb.2 Swage nipples may be ordered in any combination of end preparation.

Class Designation1

(lb)

Pipe defined as normally used with the fittings2

B16.11-1991 BS 3799:1974Socket Weld Threaded Socket Weld Threaded

2000 - Schedule 80/XS - -30003 Schedule 80/XS Schedule 160 Schedule 803 Schedule 806000 Schedule 160 XXS Schedule 1604 XXS9000 XXS - - -

Types of fittings

B16.11-1991 BS 3799:1974Socket Weld Threaded Socket Weld Threaded

3000

lb

6000

lb

9000

lb

2000

lb

3000

lb

6000

lb

3000

lb

6000

lb

3000

lb

6000

lb

Elbows, 90° and 45° ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔

Crosses ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔

Tees ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔

Couplings and half couplings ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔

Caps ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔

Square, hexagonal and round plugs1 ✔ ✔

Hexagonal head bushings1 ✔ ✔

Flush bushings1 ✔

Hexagonal and round nipples ✔ ✔

Unions ✔ ✔

Welding bosses ✔ ✔ ✔ ✔

Swage nipples2 ✔ ✔ ✔ ✔


7-3Aalco Tel. 01932 250100 Fax: 01932 250101 E-mail: [email protected]

High Pressure Fittings - General

Dimensions and Tolerances❍ Dimensions. See pages 7-6 to 7-25 for HP fitting

dimensions.❍ Size Designations for Reducing Fittings.

❍ Tolerances specified in ASME/ANSI B16.11 areincluded in the dimension tables. BS 3799tolerances are substantially the same. Additionaltolerances are as follows:

Manufacture❍ ASME/ANSI B16.11-1991. ASME/ANSI stainless

steel socket weld or threaded fittings are mostcommonly manufactured from materialconforming to ASTM A182 (see page 4-6).

❍ BS 3799:1974. Manufacturing requirements aresubstantially the same as for B16.11. Stainlesssteel grades specified are as indicated in thepressure/temperature ratings table on page 7-4.

❍ Marking should include (in priority order): - Manufacturers name or trademark - Material identification (in accordance with A 182, - Class or pressure ratings (e.g. 3000 lb) - Size Markings may be omitted (least priority first fromabove list) if fitting size or shape imposes limits.

❍ Outlets. Socket weld and threaded outletscomply with B16.11 requirements, althoughB16.11 does not specifically cover outlets.

Pressure Ratings❍ General. The Class designation (e.g. 3000 lb) of

the high pressure fittings indicates the maximumcold working pressure.

❍ ASME/ANSI B16.11 Fittings. ASME/ANSIB16.11 specifies the allowable pressure/temperature rating to be that of seamless pipe ofthe equivalent material and wall thickness.

❍ BS 3799 Fittings. BS 3799 includes a table ofpressure/temperature rating. This is reproducedon page 7-4.

❍ Outlets. These fittings conform to the pressurerequirements of ASME/ANSI B16.11.

1

3

21

2

3

41 x 2 x 3where 1 is the largest nominal size

1 x 2 x 3 x 4where 1 and 3 are the larger nominal sizes

Fitting bore and socket bore tolerancesNPS Tolerance

Concentricity of bores All ±0.8 mm

Alignment of axes All0.06 in

per 1 ft, or 1 in 200

7-4


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317

WP3

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3000 lb

6000 lb

3000 lb

6000 lb

3000 lb

6000 lb

3000 lb

6000 lb

3000 lb

6000 lb

3000 lb

6000 lb

3000 lb

6000 lb

3000 lb

6000 lb

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3000 lb

6000 lb

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3000 lb

6000 lb

3000 lb

6000 lb

3000 lb

6000 lb

3000 lb

6000 lb

3000 lb

6000 lb

3000 lb

6000 lb

3000 lb

6000 lb

3000 lb

6000 lb

3000 lb

6000 lb

3000 lb

6000 lb

3000 lb

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7-6



3000 lb Socket Weld Fittings - ANSI B16.11/BS 3799

Notes- Average socket wall thickness C around periphery shall not be less than the listed values. Minimum values are permitted

in localised areas.- Dimensions B and J are the same for Class 3000, 6000 and 9000 lb fittings.- Dimensions and tolerances shown are as specified in ASME/ANSI B16.11-1991. These agree substantially with BS

3799:1974. Exceptions are indicated in the following note.- BS 3799 does not cover NPS 4.

Dimensions and tolerances (based on ASME/ANSI B16.11-1991 and BS 3799:1974)

NPS

max

/ave

/min

Centre to Bottom ofSocket Socket

BoreDiameter

Bore Diameter of Fittings

Socket Wall

ThicknessBody Wall

Depth of

Socket90° Elbows,

Tees, &Crosses

45°Elbows

� � � � � � �

in mm in mm in mm in mm in mm in mm in mm

1/8max +0.03 12 +0.03 9 0.440 11.15 0.299 7.6 - - - - - -ave 0.44 - 0.31 - - - - - 0.125 3.20 - - - -min -0.03 10 -0.03 7 0.420 10.65 0.239 6.1 0.125 3.20 0.095 2.40 0.38 10

1/4max +0.03 12 +0.03 9 0.575 14.60 0.394 10.0 - - - - - -ave 0.44 - 0.31 - - - - - 0.149 3.80 - - - -min -0.03 10 -0.03 7 0.555 14.10 0.334 8.5 0.130 3.30 0.119 3.00 0.38 10

3/8max +0.06 15 +0.06 9 0.710 18.05 0.523 13.3 - - - - - -ave 0.53 0.31 - - - - - 0.158 4.00 - - - -min -0.06 12 -0.06 6 0.690 17.55 0.463 11.8 0.138 3.50 0.126 3.20 0.38 10

1/2max +0.06 17 +0.06 13 0.875 22.20 0.652 16.6 - - - - - -ave 0.62 0.44 - - - - - 0.184 4.65 - - - -min -0.06 14 -0.06 10 0.855 21.70 0.592 15.0 0.161 4.10 0.147 3.75 0.38 10

3/4max +0.06 21 +0.06 14 1.085 27.55 0.854 21.7 - - - - - -ave 0.75 - 0.50 - - - - - 0.193 4.90 - - - -min -0.06 18 -0.06 11 1.065 27.05 0.794 20.2 0.168 4.25 0.154 3.90 0.50 13

1max +0.08 24 +0.08 16 1.350 34.30 1.079 27.4 - - - - - -ave 0.88 - 0.56 - - - - - 0.224 5.70 - - - -min -0.08 20 -0.08 12 1.330 33.80 1.019 25.9 0.196 5.00 0.179 4.55 0.50 13

11/4max +0.08 29 +0.08 19 1.695 43.05 1.410 35.8 - - - - - -ave 1.06 - 0.69 - - - - - 0.239 6.05 - - - -min -0.08 25 -0.08 15 1.675 42.55 1.350 34.3 0.208 5.30 0.191 4.85 0.50 13

11/2max +0.08 34 +0.08 23 1.935 49.15 1.640 41.7 - - - - - -ave 1.25 - 0.81 - - - - - 0.250 6.35min -0.08 30 -0.08 19 1.915 48.65 1.580 40.1 0.218 5.55 0.200 5.10 0.50 13

2max +0.08 40 +0.08 27 2.426 61.60 2.097 53.5 - - - - - -ave 1.50 - 1.00 - - - - - 0.273 6.95 - - - -min -0.08 36 -0.08 23 2.406 61.10 2.037 51.7 0.238 6.05 0.218 5.55 0.62 16

21/2max +0.10 44 +0.10 31 2.931 74.45 2.529 64.2 - - - - - -ave 1.62 - 1.12 - - - - - 0.345 8.75 - - - -min -0.10 39 -0.10 27 2.906 73.80 2.409 61.2 0.302 7.65 0.276 7.00 0.62 16

3max +0.10 60 +0.10 34 3.560 90.40 3.128 79.5 - - - - - -ave 2.25 - 1.25 - - - - - 0.375 9.50 - - - -min -0.10 55 -0.10 29 3.535 89.30 3.008 46.4 0.327 8.30 0.300 7.60 0.62 16

4max +0.10 69 +0.10 44 4.570 116.05 4.086 103.8 - - - - - -ave 2.62 - 1.62 - - - - - 0.421 10.70 - - - -min -0.10 64 -0.10 39 4.545 115.45 3.966 100.7 0.368 9.35 0.337 8.55 0.75 19



3000 lb Socket Weld Fittings -ANSI B16.11/BS 3799


in localised areas.- Dimensions B, J, E and F are the same for Class 3000, 6000 and 9000 lb fittings.- Dimensions and tolerances shown are as specified in ASME/ANSI B16.11-1991. These agree substantially with

BS 3799:1974. Exceptions are indicated in the following notes.- BS 3799 does not cover NPS 4.1 These values for K are BS 3799 minimum values, quoted because they differ from the ASME/ANSI B16.11 values.


NPS

max

/ave

/min Socket

BoreDiameter


Socket Wall

Thickness

Depthof

Socket

Laying Lengths Cap End Wall

ThicknessCouplings HalfCouplings

� � � � ��


1/8max 0.440 11.15 0.299 7.6 - - - - +0.06 8 +0.03 17 - -ave - - - - 0.125 3.20 - - 0.25 - 0.62 - - 41

min 0.420 10.65 0.239 6.1 0.125 3.20 0.38 10 -0.06 5 -0.03 15 0.19 5.0

1/4max 0.575 14.60 0.394 10.0 - - - - +0.06 8 +0.03 17 - -ave - - - - 0.149 3.80 - - 0.25 - 0.62 - - 71

min 0.555 14.10 0.334 8.5 0.130 3.30 0.38 10 -0.06 5 -0.03 15 0.19 5.0

3/8max 0.710 18.05 0.523 13.3 - - - - +0.12 9 +0.06 19 - -ave - - - - 0.158 4.00 - - 0.25 - 0.69 - - 71

min 0.690 17.55 0.463 11.8 0.138 3.50 0.38 10 -0.12 3 -0.06 16 0.19 5.0

1/2max 0.875 22.20 0.652 16.6 - - - - +0.12 13 +0.06 24 - -ave - - - - 0.184 4.65 - - 0.38 - 0.88 - - 81

min 0.855 21.70 0.592 15.0 0.161 4.10 0.38 10 -0.12 6 -0.06 21 0.25 6.5

3/4max 1.085 27.55 0.854 21.7 - - - - +0.12 13 +0.06 25 - -ave - - - - 0.193 4.90 - - 0.38 - 0.94 - - 101

min 1.065 27.05 0.794 20.2 0.168 4.25 0.50 13 -0.12 6 -0.06 22 0.25 6.5

1max 1.350 34.30 1.079 27.4 - - - - +0.16 17 +0.08 31 - -ave - - - - 0.224 5.70 - - 0.50 - 1.12 - - 111

min 1.330 33.80 1.019 25.9 0.196 5.00 0.50 13 -0.16 9 -0.08 27 0.38 9.5

11/4max 1.695 43.05 1.410 35.8 - - - - +0.16 17 +0.08 32 - -ave - - - - 0.239 6.05 - - 0.50 - 1.19 - - 131

min 1.675 42.55 1.350 34.3 0.208 5.30 0.50 13 -0.16 9 -0.08 28 0.38 9.5

11/2max 1.935 49.15 1.640 41.7 - - - - +0.16 17 +0.08 34 - -ave - - - - 0.250 6.35 - - 0.50 - 1.25 - - 141

min 1.915 48.65 1.580 40.1 0.218 5.55 0.50 13 -0.16 9 -0.08 30 0.44 11.0

2max 2.426 61.60 2.097 53.5 - - +0.16 23 +0.08 43 - -ave - - - - 0.273 6.95 - - 0.75 - 1.62 - - 181

min 2.406 61.10 2.037 51.7 0.238 6.05 0.62 16 -0.16 15 -0.08 39 0.50 12.5

21/2max 2.931 74.45 2.529 64.2 - - +0.20 24 +0.10 45 - -ave - - - - 0.345 8.75 - - 0.75 - 1.69 - - 211

min 2.906 73.80 2.409 61.2 0.302 7.65 0.62 16 -0.20 14 -0.10 40 0.62 16.0

3max 3.560 90.40 3.128 79.5 - - - - +0.20 24 +0.10 47 - -ave - - - - 0.375 9.50 - - 0.75 - 1.75 - - 241

min 3.535 89.30 3.008 46.4 0.327 8.30 0.62 16 -0.20 14 -0.10 42 0.75 19.0

4max 4.570 116.05 4.086 103.8 - - - - +0.20 24 +0.10 50 - -ave - - - - 0.421 10.70 - - 0.75 - 1.88 - - -min 4.545 115.45 3.966 100.7 0.368 9.35 0.75 19 -0.20 14 -0.10 45 0.88 22.0

7-8



6000 lb Socket Weld Fittings - ANSI B16.11/BS 3799


in localised areas.- Dimensions B and J are the same for Class 3000, 6000 and 9000 lb fittings.- Dimensions and tolerances shown are as specified in ASME/ANSI B16.11-1991. These agree substantially with

BS 3799:1974. Exceptions are indicated in the following notes.- BS 3799 does not cover NPS 1/8, 1/4, 3/8 or 4. BS 3799 dimensions and tolerances are shown in italics.1 BS 3799 covers elbows, tees and crosses at NPS 21/2 and 3 (not covered by ASME/ANSI B16.11).


NPS

max

/ave

/min

Centre to Bottom ofSocket Socket

BoreDiameter


Socket Wall

ThicknessBody Wall

Depth of

Socket90° Elbows,

Tees, &Crosses

45°Elbows

� � � � � � �


1/8max +0.03 12 +0.03 9 0.440 11.15 0.189 4.8 - - - - - -ave 0.44 - 0.31 - - - - - 0.156 3.95 - - - -min -0.03 10 -0.03 7 0.420 10.65 0.126 3.2 0.135 3.45 0.124 3.15 0.38 10

1/4max +0.03 17 +0.03 9 0.575 14.60 0.280 7.1 - - - - - -ave 0.53 - 0.31 - - - - - 0.181 4.60 - - - -min -0.03 13 -0.03 7 0.555 14.10 0.220 5.6 0.158 4.00 0.145 3.70 0.38 10

3/8max +0.06 17 +0.06 13 0.710 18.05 0.389 9.9 - - - - - -ave 0.62 - 0.44 - - - - - 0.198 5.05 - - - -min -0.06 14 -0.06 10 0.690 17.55 0.329 8.4 0.172 4.35 0.158 4.00 0.38 10

1/2max +0.06 21 +0.06 14 0.875 22.20 0.494 12.5 - - - - - -ave 0.75 - 0.50 - - - - - 0.235 5.95 - - - -min -0.06 18 -0.06 11 0.855 21.70 0.434 11.0 0.204 5.20 0.188 4.80 0.38 10

3/4max +0.06 24 +0.06 16 1.085 27.55 0.642 16.3 - - - - - -ave 0.88 - 0.56 - - - - - 0.274 6.95 - - - -min -0.06 21 -0.06 13 1.065 27.05 0.582 14.8 0.238 6.05 0.219 5.55 0.50 13

1max +0.08 29 +0.08 19 1.350 34.30 0.845 21.5 - - - - - -ave 1.06 - 0.69 - - - - - 0.312 7.90 - - - -min -0.08 25 -0.08 15 1.330 33.80 0.785 19.9 0.273 6.95 0.250 6.35 0.50 13

11/4max +0.08 34 +0.08 23 1.695 43.05 1.190 30.2 - - - - - -ave 1.25 - 0.81 - - - - - 0.312 7.90 - - - -min -0.08 30 -0.08 19 1.675 42.55 1.130 28.7 0.273 6.95 0.250 6.35 0.50 13

11/2max +0.08 40 +0.08 27 1.935 49.15 1.368 34.7 - - - - - -ave 1.50 - 1.00 - - - 0.315 8.90 - - - -min -0.08 36 -0.08 23 1.915 48.65 1.308 33.2 0.307 7.80 0.281 7.15 0.50 13

2max +0.08 43 +0.08 31 2.426 61.60 1.717 43.6 - - - - - -ave 1.62 - 1.12 - - - - - 0.430 10.90 - - - -min -0.08 39 -0.08 27 2.406 61.10 1.657 42.1 0.374 9.50 0.344 8.75 0.62 16

21/2max - +2.5 - +2.5 2.931 74.45 - +0.8 - +0.4 - - - -ave - 571 - 321 - 54.01 - 7.71 - - - -min - -2.5 - -2.5 2.906 73.80 - -0.8 -0.0 0.276 7.00 0.62 16

3max - +2.5 - +2.5 3560 90.40 - +0.8 +0.4 - - - -ave - 641 - 411 - 67.01 - 8.31 - - - -min - -2.5 - -2.5 3.535 89.30 - -0.8 - -0.0 0.300 7.60 0.62 16



6000 lb Socket Weld Fittings -ANSI B16.11/BS 3799


in localised areas. (Dimension C is not specified in ASME/ANSI B16.11 for Class 6000 lb Caps larger than NPS 2.)- Dimensions B, J, E and F are the same for Class 3000, 6000 and 9000 lb fittings.- Dimensions and tolerances shown are as specified in ASME/ANSI B16.11-1991. These agree substantially with

BS 3799:1974. Exceptions are indicated in the following notes.- BS 3799 does not cover NPS 1/8, 1/4, 3/8 or 4. BS 3799 dimensions and tolerances are shown in italics.1 These values for K are BS 3799 minimum values, quoted because they differ from the ASME/ANSI B16.11 values.


NPS

max

/ave

/min Socket

BoreDiameter


Socket Wall

Thickness

Depthof

Socket

Laying Lengths Cap End Wall

ThicknessCouplings HalfCouplings

� � � � ��


1/8max 0.440 11.15 0.189 4.8 - - - - +0.06 8 +0.03 17 - -ave - - - - 0.156 3.95 - - 0.25 - 0.62 - - -min 0.420 10.65 0.126 3.2 0.135 3.45 0.38 10 -0.06 5 -0.03 15 0.25 6.5

1/4max 0.575 14.60 0.280 7.1 - - - - +0.06 8 +0.03 17 - -ave - - - - 0.181 4.60 - - 0.25 - 0.62 - - -min 0.555 14.10 0.220 5.6 0.158 4.00 0.38 10 -0.06 5 -0.03 15 0.25 6.5

3/8max 0.710 18.05 0.389 9.9 - - - - +0.12 9 +0.06 19 - -ave - - - - 0.198 5.05 - - 0.25 - 0.69 - - -min 0.690 17.55 0.329 8.4 0.172 4.35 0.38 10 -0.12 3 -0.06 16 0.25 6.5

1/2max 0.875 22.20 0.494 12.5 - - - - +0.12 13 +0.06 24 - -ave - - - - 0.235 5.95 - - 0.38 - 0.88 - - 5.21min 0.855 21.70 0.434 11.0 0.204 5.20 0.38 10 -0.12 6 -0.06 21 0.31 8.0

3/4max 1.085 27.55 0.642 16.3 - - - - +0.12 13 +0.06 25 - -ave - - - - 0.274 6.95 - - 0.38 - 0.94 - - 131min 1.065 27.05 0.582 14.8 0.238 6.05 0.50 13 -0.12 6 -0.06 22 0.31 8.0

1max 1.350 34.30 0.845 21.5 - - - - +0.16 17 +0.08 31 - -ave - - - - 0.312 7.90 - - 0.50 - 1.12 - - 141min 1.330 33.80 0.785 19.9 0.273 6.95 0.50 13 -0.16 9 -0.08 27 0.44 11.0

11/4max 1.695 43.05 1.190 30.2 - - - - +0.16 17 +0.08 32 - -ave - - - - 0.312 7.90 - - 0.50 - 1.19 - - 181min 1.675 42.55 1.130 28.7 0.273 6.95 0.50 13 -0.16 9 -0.08 28 0.44 11.0

11/2max 1.935 49.15 1.368 34.7 - - - - +0.16 17 +0.08 34 - -ave - - - - 0.315 8.90 - - 0.50 - 1.25 - - 191min 1.915 48.65 1.308 33.2 0.307 7.80 0.50 13 -0.16 9 -0.08 30 0.50 12.5

2max 2.426 61.60 1.717 43.6 - - - - +0.16 23 +0.08 43 - -ave - - - - 0.430 10.90 - - 0.75 - 1.62 - - 241min 2.406 61.10 1.657 42.1 0.374 9.50 0.62 16 -0.16 15 -0.08 39 0.62 16.0

21/2max 2.931 74.45 - - - +0.4 - - +0.20 24 +0.10 45 - -ave - - - - - 10.4 - - 0.75 - 1.69 - - 291min 2.906 73.80 - - - -0.0 0.62 16 -0.20 14 -0.10 40 0.75 19.0

3max 3560 90.40 - - - +0.4 - - +0.20 24 +0.10 47 - -ave - - - - - 12.2 - - 0.75 - 1.75 - - 341min 3.535 89.30 - - - -0.0 0.62 16 -0.20 14 -0.10 42 0.88 22.0

4max 4.570 116.05 - - - - - - - - - - - -ave - - - - - - - - - - - - - -min 4.545 115.45 - - - - 0.75 19 - - - - 1.12 28.5

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0.73

518

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0927

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300

33.0

90°

Elbo

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eC

ross

45°

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w

7-12


Aal

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1932

250

100

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: 019

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3000

lb a

nd 6

000

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hrea

ded

Fitti

ngs

- AN

SI B

16.1

1/BS

379

9

Not

e-

Dim

ensi

ons

and

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es s

how

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spe

cifie

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ASM

E/AN

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99:1

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Exc

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BS 3

799

does

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600

0 lb

cap

s w

ith N

PS >

2.-

BS 3

799

dim

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ons

G a

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2 va

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ly fr

om th

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SI v

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s qu

oted

. Dim

ensi

on B

is n

ot s

peci

fied

in B

S 37

99.

-D

imen

sion

B is

the

leng

th o

f per

fect

thre

ad. L

2 is

the

effe

ctiv

e le

ngth

of t

hrea

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sed

on A

NSI

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E B1

.20.

1 (N

TP),

see

page

10-

11.

Dim

ensi

ons

and

tole

ranc

es (b

ased

on

ASM

E/A

NSI

B16

.11-

1991

and

BS

3799

:197

4)

NPS

End

to E

nd C

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End

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aps

OD

End

Wal

l Thi

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of T

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d�

��

��

�

3000

lb &

600

0lb

3000

lb60

00lb

3000

lb60

00lb

3000

lb60

00lb

inm

min

mm

inm

min

mm

inm

min

mm

inm

min

mm

inm

m1 /

81.

2532

0.75

190.

6216

0.88

220.

195.

00.

256.

50.

2639

6.5

1 /4

1.38

351.

0025

1.06

270.

7519

1.00

250.

195.

00.

256.

50.

328.

00.

4018

10.0

3 /8

1.50

381.

0025

1.06

270.

8822

1.25

320.

195.

00.

256.

50.

369.

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4078

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1 /2

1.88

481.

2532

1.31

331.

1229

1.50

380.

256.

50.

318.

00.

4311

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3 /4

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4437

1.50

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3835

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318.

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3860

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2.62

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8848

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6292

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5064

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9323

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5665

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0012

70.

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200

30.5

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90.

8822

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1228

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300

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Cap


7-13

Aal

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1932

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Plug

s an

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gs -

ANSI

B16

.11/

BS 3

799

Not

es-

Plug

s an

d bu

shes

are

not

des

igna

ted

by C

lass

and

may

be

used

at r

atin

gs u

p to

Cla

ss 6

000

lb.

-D

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s an

d to

lera

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sho

wn

are

as s

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fied

in A

SME/

ANSI

B16

.11-

1991

. The

se a

gree

sub

stan

tially

with

BS

3799

:197

4.

Dim

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ons

and

tole

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es (b

ased

on

ASM

E/A

NSI

B16

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1991

and

BS

3799

:197

4)

NPS

Leng

th

min

Squ

are

Hea

d P

lugs

Rou

nd H

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Plug

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lugs

and

Bus

hing

sH

eigh

t of S

quar

em

inW

idth

Fla

ts

min

Dia

met

er o

f Hea

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min

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Wid

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no

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60.

287.

00.

4110

1.38

350.

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256

1 /4

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389.

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80.

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318

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7-14



Hexagonal and Round Nipples - BS 3799

Note- Other round nipple lengths, L, are available when specified.

Hexagonal nipple dimensions (based on BS 3799:1974)

Nominal Size �min

��min �

min�

min�

min�minEqual Reducing 3000 lb 6000 lb

in mm in mm mm mm mm mm mm mm mm1/8 6 - - 11 5 2 6 10 - 261/4 8 - - 15 8 6 6 15 - 36- - 1/4 x 1/8 8 x 6 15 5 2 6 15 10 31

3/8 10 - - 18 11 8 8 16 - 40- - 3/8 x 1/4 10 x 8 18 8 6 8 16 15 39

1/2 15 - - 22 14 11 8 20 - 48- - 1/2 x 3/8 15 x 10 22 11 8 8 20 16 44- - 1/2 x 1/4 15 x 8 22 8 6 8 20 15 43

3/4 20 - - 27 19 13 10 21 - 52- - 3/4 x 1/2 20 x 15 27 14 11 9 21 20 50- - 3/4 x 3/8 20 x 10 27 11 8 9 21 16 461 25 - - 35 24 17 10 25 - 60- - 1 x 3/4 25 x 20 35 19 13 10 25 21 56- - 1 x 1/2 25 x 15 35 14 11 10 25 20 55

11/2 40 - - 50 38 30 16 26 - 68- - 11/2 x 1 40 x 25 50 24 17 16 26 25 67- - 11/2 x 3/4 40 x 20 50 19 13 16 26 21 63- - 11/2 x 1/2 40 x 15 50 14 11 16 26 20 622 50 - - 62 49 39 17 27 - 71- - 2 x 11/2 50 x 40 62 38 30 17 27 26 70- - 2 x 1 50 x 25 62 24 17 18 27 25 70- - 2 x 3/4 50 x 20 62 19 13 17 27 21 65- - 2 x 1/2 50 x 15 62 14 11 18 27 20 65

Round nipple dimensions (based on BS 3799:1974)

Nominal SizeStandard Lengths Wall Thickness

�

in mm mm mm mm mm 3000 lb 6000 lb1/8 6 50 75 100 150

Schedule 80

-1/4 8 50 75 100 150 -3/8 10 50 75 100 150 -1/2 15 - 75 100 150

XXS

3/4 20 - 75 100 1501 25 - 75 100 150

11/2 40 - 75 100 1502 50 - 75 100 150

21/2 65 - - 100 1503 80 - - 100 1504 100 - - - 150

Hexagonal Nipples Round Nipples



Welding Bosses - BS 3799

Threaded welding boss dimensions (BS 3799:1974)

Nominal SizeLength of Thread Length Bore Diameter Outside Diameter

��

3000 lb 6000 lbin mm mm mm mm mm mm1/8 6 6.70 38 8.4 16 221/4 8 10.21 41 11.1 19 263/8 10 10.36 45 14.2 22 321/2 15 13.56 51 18.0 29 383/4 20 13.86 51 23.0 35 451 25 17.34 51 29.0 45 60

11/2 40 18.38 51 44.0 64 762 50 19.22 51 56.0 76 95

21/2 65 28.89 51 67.0 95 -3 80 30.48 57 82.0 110 -4 100 33.02 64 95.0 140 -

Socket-welding welding boss dimensions (BS 3799:1974)

NPS

Bore Diameter of Socket

min

Socket Wall Thickness

minBore Diameter of

Fitting LengthDepth of Socket

min

��

�� 3000 lb 6000 lb 3000 lb 6000 lbin mm mm mm mm mm mm mm mm1/8 6 10.7 3.2 - 6.8 - 28 101/4 8 14.1 3.3 - 9.2 - 32 103/8 10 17.6 3.5 - 12.5 - 34 111/2 15 21.8 4.1 5.2 15.5 11.8 38 133/4 20 27.4 4.3 6.1 21.0 15.5 38 131 25 34.1 5.0 7.0 26.5 20.7 35 16

11/2 40 49.0 5.6 7.8 40.5 34.0 32 192 50 61.0 6.1 9.5 52.0 43.0 29 22

21/2 65 73.8 7.7 10.4 62.0 54.0 29 223 80 89.7 8.3 12.2 78.0 66.0 29 22

Threaded Fitting Socket Weld Fitting

7-16



Threaded Unions - BS 3799

Threaded union dimensions (BS 3799:1974)

Nominal Size

3000 lb

End to EndWidth A/F Union Nut

min

Height of Union Nut

min

Width A/F of Ends min

Thickness of Shoulder

min

Length of Thread

min� � � � � �

in mm mm mm mm mm mm mm1/8 6 40 32 16 17 3.2 6.701/4 8 43 32 18 19 3.2 10.213/8 10 48 36 19 22 3.2 10.361/2 15 51 43 21 30 4.0 13.563/4 20 57 50 24 36 4.8 13.861 25 64 60 25 41 4.8 17.34

11/4 32 70 70 29 50 5.6 17.9311/2 40 79 78 30 60 5.6 18.382 50 89 95 37 70 6.4 19.22

21/2 65 118 125 48 85 9.6 28.893 80 121 140 51 100 12.7 30.48



Socket Weld Unions - BS 3799

Note- Bore diameter D corresponds to schedule 40 pipe.

Socket weld union dimensions (BS 3799:1974)

NPS

3000 lb

Depth of Socket

min

Distance between Bottom of Sockets

min

Bore Diameter

of Sockets

min

Socket Wall

Thicknessmin

Bore Diameterof Union

Thickness of

Shoulder min

Width A/F of Nut min

Height of Nut min

� � � � � � �

in mm mm mm mm mm mm mm mm mm1/8 6 10 17 10.7 3.2 6.8 3.2 32 161/4 8 10 17 14.1 3.3 9.2 3.2 32 183/8 10 10 17 17.6 3.5 12.5 3.2 36 191/2 15 10 18 21.8 4.1 15.5 4.0 41 213/4 20 13 20 27.4 4.3 21.0 4.8 50 241 25 13 26 34.1 5.0 26.5 4.8 60 25

11/4 32 13 28 42.9 5.3 35.0 5.6 70 2911/2 40 13 30 49.0 5.6 40.5 5.6 78 302 50 16 36 61.0 6.1 52.0 6.4 95 37

21/2 65 16 57 73.8 7.7 62.0 9.6 125 483 80 16 70 89.7 8.3 78.0 12.7 140 51

7-18



Swage Nipples - BS 3799

Dimensions of swage nipples (BS 3799:1974)

Nominal Size

Parallel Length, min Eccentricity Wall Thickness

� � ��

��(both ends)Threaded

/Plain Plain Threaded3000 lb 6000 lb 3000 lb 6000 lb 6000 lbin mm mm mm mm mm mm

3/8 x 1/4 10 x 8 76 48 16 1.6 -

Schedule 80

- -1/2 x 3/8 15 x 10 89 56 19 1.6 - - -1/2 x 1/4 15 x 8 89 56 19 3.2 - - -3/4 x 1/2 20 x 15 95 57 22 2.4 2.4 Schedule

160 XXS3/4 x 3/8 20 x 10 95 57 22 4.0 - - -1 x 3/4 25 x 20 102 64 22 2.8 2.0

Schedule 160 XXS

1 x 1/2 25 x 15 102 64 22 5.2 4.411/2 x 1 40 x 25 114 70 25 6.7 6.411/2 x 3/4 40 x 20 114 70 25 9.5 8.311/2 x 1/2 40 x 15 114 70 25 11.9 10.72 x 11/2 50 x 40 165 108 29 5.6 5.22 x 1 50 x 25 165 108 29 12.7 11.52 x 3/4 50 x 20 165 108 29 15.5 13.52 x 1/2 50 x 15 165 108 29 17.5 15.921/2 x 2 65 x 50 178 114 32 4.8 3.2

21/2 x 11/2 65 x 40 178 114 32 10.3 8.33 x 21/2 80 x 65 203 133 41 7.1 6.73 x 2 80 x 50 203 133 41 11.9 9.9

3 x 11/2 80 x 40 203 133 41 17.5 15.54 x 3 100 x 80 229 140 48 11.9 10.7

4 x 21/2 100 x 65 229 140 48 19.1 17.5

Plain Threaded Threaded Plain



OutletsOutlets may be used in place of welded or threaded tees to reduce costs and providemore flexible fabrication (‘run your pipe then weld on fittings’) while maintaining full pipestrength for all sizes, weights and schedules. The following pages contain the dimensiontables for socket weld, threaded and buttweld outlets. Note- Manufacture’s information is used as the basis for information in this outlets subsection. Manufacturers’ data may vary.

Specifications❍ Manufacture. Socket weld and threaded outlets

are manufactured to the requirements of ASME/ANSI B16.11 - Forged fitting, socket welding andthreaded, although outlet dimensions are notspecified in B16.11. Buttweld outlets aremanufactured to the requirements of ASME/ANSIB16.9 - Factory-made wrought steel buttweldingfittings, although outlet dimensions are notspecified in B16.9.

❍ Pressure Rating. Outlets are rated the same asseamless steel pipe, as defined in the AmericanNational Standard Codes for Pressure Piping,ANSI B31.1 and B31.3, the ASME Boiler andPressure Vessel Code. Refer to page 5-28 for asummary of pipe pressure rating calculations.

DesignationsIn order to reduce warehouse inventories, outlets of the same size are designed to be used with the a range ofrun pipe sizes. This can be done without causing a problem when welding because the resulting maximum gapbetween welded surfaces (caused by the curvature of the outlet when compared with the pipe) is only 1/32 in(0.8 mm). The table below shows the range of outlets available. For example: outlets with a run size range (e.g. 8 - 3 x 1/2) will fit on any size of run pipes in the range (e.g. 3,31/2, 4, 5, 6 or 8).

Outlet Pipe Sizes (NPS)1/2 3/4 1 11/4 11/2 2 21/2 3 31/2 4 >4

Run pipe sizes (NPS) for:3000 lb Socket Weld Outlets, 3000 lb Threaded Outlets,Std & XS Buttweld Outlets,

1/2 3/4 1 11/4 11/2 2 21/2 3 31/2 4

Ord

er to

spe

cific

run

pipe

siz

e31/4 1 11/4 11/2 2 21/2 3 31/2 4 51 11/2-11/4 11/2 2 21/2 3 31/2 4 5 6

11/2-11/4 21/2-2 2 21/2 3 31/2 4 5 6 8

21/2-2 5-3 21/2 31/2-3 4-31/2 4 5 6 8 108-3 12-6 31/2-3 5-4 6-5 5 6 8 10 14-2

36-10 36-14 5-4 8-6 12-8 6 8 10 14-12 20-6Flat Flat 10-6 18-10 24-14 10-8 12-10 14-12 20-16 36-4

- - 36-12 36-20 36-26 18-12 18-14 20-16 36-24 Flat- - Flat Flat Flat 36-20 36-20 36-24 - -- - - - - Flat Flat Flat - -

Run pipe sizes (NPS) for: 6000 lb Socket weld Outlets,6000 lb Threaded Outlets,XXS Buttweld Outlets.

1-3/4 1 11/4-11/2 11/2 2 21/2

Order to specific run pipe size

2-11/4 21/2-11/4 21/2-2 21/2-2 21/2 36-21/2 10-3 10-3 31/2-3 31/2-3 436-8 36-12 36-12 8-4 5-4 5Flat Flat Flat 20-10 8-6 6

- - - 36-24 18-10 10-8- - - Flat 36-20 20-12- - - - Flat 36-24- - - - - Flat

7-20



Socket Weld Outlets

3000 lb socket weld outlet dimensions and weights

Outlet Size

Reducing sizesWeight

Full sizesWeight

� � � � � � �

mm mm mm mm kg/piece mm mm mm mm mm kg/

piece1/2 25.50 24.00 31.80 10.00 0.140 25.50 22.40 16.00 31.80 10.00 0.0603/4 27.00 30.00 36.60 13.00 0.150 27.00 30.00 21.00 36.60 13.00 0.1101 33.40 36.50 46.10 13.00 0.300 33.40 36.50 26.70 46.10 13.00 0.300

11/4 33.40 44.50 55.60 13.00 0.400 33.40 44.50 35.00 55.60 13.00 0.30011/2 34.80 51.00 62.00 13.00 0.470 34.80 51.00 40.90 62.00 13.00 0.4002 38.00 65.00 74.70 16.00 0.730 38.00 65.00 52.50 74.70 16.00 0.630

21/2 46.00 76.15 87.40 16.00 1.250 46.00 76.15 62.80 87.40 16.00 1.0303 50.70 93.50 104.80 16.00 1.720 50.70 93.50 77.90 104.80 16.00 1.700

31/2 53.80 101.50 122.30 19.00 1.950 53.30 112.75 90.10 117.50 19.00 1.9504 57.00 120.50 130.20 19.00 3.300 55.50 127.00 102.20 130.20 19.00 3.000

6000 lb socket weld outlet dimensions and weights

Outlet Size


� � �

mm mm mm mm kg/piece1/2 31.50 19.00 40.00 10.00 0.2503/4 36.50 25.50 46.00 13.00 0.3701 39.60 33.40 57.20 13.00 0.600

11/4 41.00 38.00 65.10 13.00 0.75011/2 42.70 49.30 76.30 13.00 0.920

Reducing Size Full Size



Threaded and Nipple Outlets

3000 lb threaded outlet dimensions and weights

Outlet Size


Full sizesWeight

� � � � � � �

mm mm mm kg/piece mm mm mm mm kg/piece1/2 25.50 24.00 31.80 0.110 25.50 24.00 16.00 31.80 0.0703/4 27.00 30.00 36.60 0.160 27.00 30.00 20.65 36.60 0.1101 33.40 36.50 46.10 0.300 33.40 36.50 27.00 46.10 0.200

11/4 33.40 44.50 55.60 0.410 33.40 44.50 34.90 55.60 0.32011/2 34.80 51.00 62.00 0.450 34.80 51.00 41.20 62.00 0.4102 38.00 65.00 74.70 0.800 38.00 65.00 52.40 74.70 0.650

21/2 46.00 76.15 87.40 1.370 46.00 76.15 63.50 87.40 1.1303 50.70 93.50 104.80 2.000 50.70 93.50 77.80 104.80 1.950

31/2 53.80 101.50 122.30 2.610 53.30 112.75 90.50 117.50 2.0504 57.00 120.50 130.20 3.230 55.50 120.50 103.20 130.20 3.090

6000 lb threaded outlet dimensions and weights

Outlet Size


� � �

mm mm mm kg/piece1/2 31.50 19.00 40.00 0.0203/4 36.50 25.50 46.00 0.3501 39.60 33.40 57.20 0.600

11/4 41.00 38.00 65.10 071011/2 42.70 49.30 76.30 0.9002 52.10 70.00 92.10 2.300


Nipple

Plain end nipple outlet dimensions

Outlet Size

Reducing sizes3000 lb 6000 lb

� � � �

mm mm mm mm1/2 89 24 89 14.53/4 89 30 89 19.01 89 36.5 89 25.5

11/4 89 44.5 89 33.411/2 89 51 89 38.02 89 65 89 43

7-22



Buttweld Outlets

Standard buttweld outlet dimensions and weights

Outlet SizeReducing sizes

WeightFull sizes

Weight� � � � �

mm mm kg/piece mm mm mm kg/piece1/2 19.00 24.00 0.08 19.00 24.00 15.80 0.073/4 22.20 30.00 0.11 22.20 30.00 21.00 0.111 27.00 36.50 0.25 27.00 36.50 26.60 0.18

11/4 31.50 44.50 0.35 31.50 44.50 35.00 0.3211/2 33.40 51.00 0.45 33.40 51.00 40.90 0.362 38.00 65.00 0.80 38.00 65.00 52.50 0.68

21/2 41.20 76.15 1.13 41.20 76.15 62.80 1.023 44.50 93.50 1.82 44.50 93.50 78.00 1.70

31/2 47.50 112.60 2.50 47.50 112.60 90.20 2.304 51.00 120.50 2.86 51.00 120.50 102.20 3.105 57.00 141.30 4.65 57.00 141.30 128.20 3.906 60.30 170.00 6.45 60.30 170.00 154.00 6.708 69.80 220.50 10.66 69.80 220.50 202.50 13.00

10 78.00 274.00 18.00 78.00 274.00 254.00 16.0012 86.00 324.00 27.00 86.00 324.00 304.50 27.0014 89.00 356.00 30.00 89.00 356.00 336.50 32.0016 94.00 406.00 34.00 94.00 406.00 387.00 42.0018 97.00 459.00 44.00 103.00 473.00 438.00 57.0020 102.00 508.00 54.00 117.00 508.00 489.00 80.0024 144.00 609.00 101.00 144.00 609.00 590.00 114.0026 156.00 660.00 120.00 156.00 660.00 641.00 138.0030 175.00 762.00 190.00 175.00 762.00 743.00 230.0036 206.00 914.00 310.00 206.00 914.00 895.00 336.00




Buttweld Outlets

Extra strong (XS) buttweld outlets dimensions and weights


WeightFull sizes

Weight� � � � �

mm mm kg/piece mm mm mm kg/piece1/2 19 24.00 0.09 19.00 24.00 13.90 0.073/4 22.20 30.00 0.14 22.20 30.00 18.90 0.111 27.00 36.50 0.21 25.40 36.50 24.30 0.18

11/4 31.50 44.50 0.41 28.50 44.50 32.80 0.3211/2 33.40 51.00 0.50 31.50 51.00 38.10 0.412 38.00 65.00 0.80 38.00 65.00 49.30 0.75

21/2 41.20 76.15 1.18 41.20 76.15 59.00 1.153 44.50 93.50 1.90 44.50 93.50 73.70 1.90

31/2 47.50 112.60 2.55 47.50 112.60 85.40 2.304 51.00 120.50 3.00 51.00 120.50 97.20 3.505 57.00 141.30 4.75 57.00 141.30 122.30 4.306 78.00 170.00 10.50 78.00 170.00 146.30 6.808 98.50 220.00 17.00 98.50 220.00 194.00 14.60

10 94.00 265.00 21.00 98.30 256.00 247.50 21.0012 103.00 613.00 28.00 100.00 320.00 298.00 28.0014 100.00 351.00 32.00 105.50 355.00 330.00 34.5016 106.50 403.00 46.50 113.00 419.00 381.00 52.2018 111.00 456.00 59.00 119.00 474.00 432.00 59.0020 119.00 510.00 72.00 127.00 528.00 482.50 85.0024 152.00 610.00 142.00 152.00 610.00 584.20 146.0026 165.00 660.00 168.00 165.00 660.00 635.00 182.0030 181.00 762.00 218.00 181.00 762.00 738.00 255.0036 212.50 914.00 404.00 212.00 914.00 889.00 446.00

Schedule 160 and double extra strong (XXS) buttweld outlets dimensions and weights


WeightFull sizes

� � � � �

mm mm kg/piece mm mm mm1/2 28.50 14.30 0.110 28.50 14.30 0.1103/4 31.50 19.00 0.320 31.50 19.00 0.3201 38.00 25.50 0.380 38.00 25.50 0.380

11/4 44.50 33.40 0.570 44.50 33.40 0.57011/2 50.70 38.00 0.800 50.70 38.00 0.8002 55.50 42.90 1.00 55.50 42.90 1.00

21/2 61.80 53.90 1.550 61.80 53.90 1.5503 73.00 73.00 2.900 73.00 73.00 2.9004 84.00 98.40 4.770 84.00 98.40 4.7705 93.50 122.20 6.470 93.50 122.20 6.4706 104.70 146.00 12.80 104.70 146.00 13.80


7-24



45° Lateral Outlets

3000 lb lateral outlets - for 45° lateral connections dimensions and weights

Nominal Run Sizes

Outlet SizeDimensions

Weight� �

OD of OutletSocket Weld &

Threaded Buttweld

in mm mm mm - kg/piece21/2-11/4,

12-31/4 36.5 39.7 31.8

Outside diameter at

bevel matches the outlet

pipe diameter

0.23

21/2-11/4, 12-3

3/8 36.5 39.7 31.8 0.23

21/2-11/4, 12-3

1/2 36.5 39.7 31.8 0.30

11/2-11/4, 5-2, 12-6

3/4 43.6 47.6 35.7 0.34

21/2-2, 5-2, 12-6 1 54.0 57.2 45.2 0.52

21/2-2, 5-3, 12-6 11/4 67.5 61.9 54.6 0.86

21/2-2, 5-3,12-6 11/2 76.2 66.7 63.5 1.20

5-4, 8-6,12-10 2 104.8 81.0 82.6 3.29

6000 lb lateral outlets - for 45° lateral connections dimensions and weights

Nominal Elbow Size


Weight� �


Threaded Buttweld

in mm mm mm - kg/piece21/2-11/4,

12-31/4 36.5 39.7 31.8

Outside diameter at


pipe diameter

0.34

21/2-11/4, 12-3

3/8 36.5 39.7 31.8 0.34

11/2-11/4, 5-2,12-6

1/2 43.6 47.6 35.7 0.39

21/2-2, 5-3,12-6

3/4 54.0 57.2 45.2 0.57

21/2-2, 5-3,12-6 1 67.5 61.9 54.8 1.00

21/2-2, 5-3,12-6 11/4 76.2 66.7 63.5 1.32

5-4, 8-6, 12-10 11/2 104.8 81.0 82.6 2.80

ThreadedSocket Weld Buttweld



Elbow Outlets

3000 lb elbow outlet for 90° long radius elbow, dimensions and weights

Nominal Elbow Size


Weight� �


Threaded Buttweld

in mm mm mm - kg/piece36-11/4 1/4 38.1 38.1 31.8

Outside diameter at


pipe diameter

0.2336-11/4 3/8 38.1 38.1 31.8 0.2336-11/4 1/2 38.1 38.1 31.8 0.3036-11/4 3/4 43.6 45.2 35.7 0.3436-2 1 54.0 52.4 45.2 0.5236-2 11/4 73.0 55.6 54.8 0.8636-2 11/2 79.4 58.8 63.5 1.2036-3 2 106.4 69.9 82.6 2.39

6000 lb elbow outlet for 90° long radius elbow, dimensions and weights

Nominal Elbow Size


Weight� �


Threaded Buttweld

in mm mm mm - kg/piece36-11/4 1/4 38.1 38.1 31.8

Outside diameter at


pipe diameter

0.3436-11/4 3/8 38.1 38.1 31.8 0.3436-11/4 1/2 43.6 45.2 35.7 0.3936-2 3/4 54.0 54.4 45.2 0.5736-2 1 73.0 55.6 54.8 1.0036-2 11/4 79.4 58.8 63.5 1.7736-3 11/2 106.4 69.6 82.6 2.80

ThreadedSocket Weld Buttweld

7-26



Low Pressure Threaded Fittings - General This subsection summarises requirements for 150 lb low pressure (LP) threaded fittingsas defined in BS 1740 : Part 1 : 1971 (as confirmed October 1983) - Wrought steel pipefittings (screwed BSP thread). Dimensions and tolerances are reproduced in the followingpages. Stainless steel low pressure threaded fittings are in general accordance with thesedimensions and tolerances.

Dimensions and TolerancesBS 1740 dimensions are as detailed in the following pages. Length tolerances are as specified below.

Threading RequirementsFittings manufactured to BS 1740 are threaded in accordance with BS 21:1985, Pipe threads for tubes andfittings where pressure-tight joints are made on the threads (metric dimensions). Summary dimensions areincluded below. For further information on BS 21 threads see page 10-10.

BS 1740 Tolerances

NPS Length of Socket Unions Length or Centre to Face Tolerances for Other Fittings

±mm ±mm<25 6 1.5

25 to 40 6 3.0>40 to 65 10 4.5>65 to 75 12 6.0>75 to 110 16 ->75 to 150 - 8.0

>150 - 10.0

Internal parallel and external taper thread

Nominal Size of Outlet

Minimum Outside Diameter

Minimum Outside Diameter of Body Behind External Thread

Minimum Inside Diameter of Body Behind Internal Thread

� � �

in mm mm mm mm1/8 6 15.0 9.8 8.61/4 8 18.5 13.3 11.43/8 10 22.0 16.8 15.01/2 15 27.0 21.1 18.63/4 20 32.5 26.6 24.11 25 39.5 33.4 30.3

11/4 32 49.0 42.1 39.011/2 40 56.0 48.0 44.82 50 68.0 59.8 56.7

21/2 65 84.0 75.4 72.23 80 98.0 88.1 84.94 100 124.0 113.3 110.15 125 151.0 138.7 135.56 150 178.0 164.1 160.9

Internal Parallel Thread (Rp) External Taper Thread (R)



Equal Elbows, Tees and Crosses - BS 1740

Threaded equal 90°elbow, tee and cross dimensions (BS 1740:Part 1)

Nominal Size of OutletsCentre to Face

�

in mm mm1/8 6 161/4 8 223/8 10 251/2 15 323/4 20 351 25 43

11/4 32 5111/2 40 522 50 64

21/2 65 763 80 894 100 1155 125 1406 150 160

Threaded equal 45° equal elbow dimensions (BS 1740:Part 1)

Nominal Size of OutletsCentre to Face

�

in mm mm3/8 10 191/2 15 223/4 20 271 25 33

11/4 32 3811/2 40 442 50 51

Equal Elbow Equal Tee Cross Equal Equal 45° Elbow

7-28



Elbows - BS 1740

Note1 Non-prefered size. The use of these sizes should be avoided.

Threaded equal elbows, male and female dimensions (BS 1740:Part 1)

Nominal Size of OutletsCentre to face, min Bore of Male

End minBore of Male

End max� �

in mm mm mm mm mm1/4 8 19 27 6.5 8.03/8 10 21 29 8.5 10.51/2 15 25 35 11.5 13.03/4 20 30 40 18.0 21.01 25 37 46 24.0 26.0

11/4 32 43 54 30.0 32.011/2 40 49 57 37.0 39.02 50 59 70 48.0 51.0

21/2 65 68 83 62.0 66.03 80 81 94 75.0 79.04 100 100 115 97.0 104.0

Threaded reducing elbow dimensions (BS 1740:Part 1)

Nominal Size of Outlets(1 x 2)

Centre to Face, min� �

in mm mm mm1/2 x 3/4 15 x 8 25 321/2 x 3/8 15 x 10 27 32

3/4 x 3/8 1 20 x 101 29 353/4 x 1/2 20 x 15 32 351 x 1/2 25 x 15 35 431 x 3/4 25 x 20 38 43

11/4 x 1/2 1 32 x 151 38 5111/4 x 3/4 32 x 20 41 5111/4 x 1 32 x 25 44 5111/2 x 3/4 40 x 20 41 5211/2 x 1 40 x 25 44 52

11/2 x 11/4 40 x 32 49 522 x 3/4 1 50 x 201 44 64

2 x 1 50 x 25 48 642 x 11/4 50 x 32 52 642 x 11/2 50 x 40 56 64

Reducing Elbows

Note- These may also be referred to as Street Elbows

Equal Elbows, Male and Female



Increasing and Reducing Tees - BS 1740

Threaded tee, increasing on branch, dimensions (BS 1740:Part 1)


Centre to Facemin

� �

in mm mm mm3/8 x 1/2 10 x 15 32 271/2 x 3/4 15 x 20 35 321/2 x 1 15 x 25 43 353/4 x 1 20 x 25 43 381 x 11/4 25 x 32 51 441 x 11/2 25 x 40 52 44

11/4 x 11/2 32 x 40 52 4911/2 x 2 40 x 50 64 562 x 21/2 50 x 65 76 672 x 3 50 x 80 89 73

Threaded tee, reducing on branch and/or run, dimensions (BS 1740:Part 1)

Nominal Size of Outlets(1 x 2 x 3)

Centre to Face min

� �

in mm mm mm3/4 x 1/2 x 1/2 20 x 15 x 15 32 353/4 x 1/2 x 3/4 20 x 15 x 20 35 351 x 3/4 x 1/2 25 x 20 x 15 35 431 x 3/4 x 3/4 25 x 20 x 20 38 431 x 3/4 x 1 25 x 20 x 25 43 43

11/4 x 1 x 3/4 32 x 25 x 20 41 5111/4 x 1 x 1 32 x 25 x 25 44 51

11/4 x 1 x 11/4 32 x 25 x 32 51 5111/2 x 1 x 1 40 x 25 x 25 44 52

Increasing on the Branch Tee Reducing on the Run and Branch Tee

Reducing on the Run Only Tee

7-30



Reducing Tees - BS 1740

Note1 Non-prefered size. The use of these sizes should be avoided.

Reducing on the Branch Tee

Reducing tee dimensions (BS 1740:Part 1)


Centre to Face, min� �

in mm mm mm3/8 x 1/4 10 x 8 22 241/2 x 1/4 15 x 8 25 321/2 x 3/8 15 x 10 27 323/4 x 1/4 20 x 8 27 353/4 x 3/8 20 x 10 29 353/4 x 1/2 20 x 15 32 351 x 1/4 1 25 x 81 30 431 x 3/8 1 25 x 101 32 431 x 1/2 25 x 15 35 431 x 3/4 25 x 20 38 43

11/4 x 1/2 32 x 15 38 5111/4 x 3/4 32 x 20 41 5111/4 x 1 32 x 25 44 51

11/2 x 1/2 1 40 x 151 38 5211/2 x 3/4 40 x 20 41 5211/2 x 1 40 x 25 44 52

11/2 x 11/4 40 x 32 49 522 x 1/2 1 50 x 151 41 642 x 3/4 1 50 x 201 44 64

2 x 1 50 x 25 48 642 x 11/4 50 x 32 52 642 x 11/2 50 x 40 56 6421/2 x 1 65 x 25 54 76

21/2 x 11/2 65 x 40 60 7621/2 x 2 65 x 50 67 763 x 1 80 x 25 60 89

3 x 11/4 80 x 32 64 893 x 11/2 80 x 40 67 893 x 2 80 x 50 73 89

3 x 21/2 80 x 65 79 894 x 11/2 100 x 40 76 1154 x 2 100 x 50 83 1154 x 3 100 x 80 95 1156 x 3 150 x 80 120 1606 x 4 150 x 100 135 160



Sockets - BS 1740

Note- The backnut is used with the faced socket for long screws.

Equal socket, half socket, faced socket and backnut dimensions (BS1740:Part 1)

Nominal Size of Outlets

Outside Diameter

min

Standard Socket Length

min

Half Socket Length

min

Faced Socket Length

min

Backnut Width Across Flats

Backnut Thickness

� � � � �

Minimum Tolerancein mm mm mm mm mm mm mm mm1/8 6 15.0 19 8 17 17.0 6.5 +1.51/4 8 18.5 27 11 25 19.0 6.5 +1.53/8 10 22.0 28 12 25 24.0 7.0 +1.51/2 15 27.0 37 16 35 30.0 8.0 +1.53/4 20 32.5 39 19 37 36.0 9.0 +1.51 25 39.5 46 21 43 41.0 9.5 +1.5

11/4 32 49.0 51 25 48 50.0 11.0 +1.511/2 40 56.0 51 25 48 60.0 12.0 +1.52 50 68.0 60 28 57 70.0 13.0 +1.5

21/2 65 84.0 69 30 65 90.0 17.0 +3.03 80 98.0 75 35 71 100.0 21.0 +3.04 100 124.0 87 40 84 130.0 22.0 +3.05 125 151.0 96 44 92 160.0 24.0 +3.06 150 178.0 96 44 92 190.0 25.0 +3.0

Standard Socket Half Socket Faced Socket for Longscrews Backnut

7-32



Sockets - BS 1740

Reducing socket dimensions (BS1740:Part 1)


Centre to Face min�

in mm mm1/4 x 1/8 8 x 6 253/8 x 1/8 10 x 6 303/8 x 1/4 10 x 8 291/2 x 1/8 15 x 6 411/2 x 1/4 15 x 8 401/2 x 3/8 15 x 10 383/4 x 1/4 20 x 8 443/4 x 3/8 20 x 10 433/4 x 1/2 20 x 15 411 x 1/4 25 x 8 541 x 3/8 25 x 10 521 x 1/2 25 x 15 511 x 3/4 25 x 20 49

11/4 x 3/8 32 x 10 60

Reducing Socket

11/4 x 1/2 32 x 15 5911/4 x 3/4 32 x 20 5711/4 x 1 32 x 25 5611/2 x 1/2 40 x 15 6511/2 x 3/4 40 x 20 6411/2 x 1 40 x 25 62

11/2 x 11/4 40 x 32 602 x 1/2 50 x 15 702 x 3/4 50 x 20 682 x 1 50 x 25 67

2 x 11/4 50 x 32 652 x 11/2 50 x 40 6421/2 x 1 65 x 25 76

21/2 x 11/4 65 x 32 7521/2 x 11/2 65 x 40 7321/2 x 2 65 x 50 713 x 1 80 x 25 86

3 x 11/4 80 x 32 843 x 11/2 80 x 40 833 x 2 80 x 50 81

3 x 21/2 80 x 65 794 x 11/2 100 x 40 1054 x 2 100 x 50 100

4 x 21/2 100 x 65 1004 x 3 100 x 80 985 x 3 125 x 80 1155 x 4 125 x 100 1156 x 3 150 x 80 1406 x 4 150 x 100 140

Reducing socket dimensions (BS1740:Part 1) (Continued)


Centre to Face min�

in mm mm

Socket Union

Socket unions dimensions (BS 1740:Part 1)

Nominal Size of OutletLength

min�

in mm mm1/8 6 381/4 8 443/8 10 511/2 15 573/4 20 671 25 76

11/4 32 8511/2 40 1002 50 110



Caps and Plugs - BS 1740

Note* This dimension is to be not less than the fitting allowance in BS 21 (see page 10-10).- Plugs in sizes 25 to 150 may be solid or hollow. The purchaser should stated which is required on the order.

Cap dimensions (BS 1740:Part 1)

Nominal SizeLength

minThickness

min�

in mm mm mm1/8 6 19 3.5

Flat Cap Dome Cap

1/4 8 24 3.53/8 10 27 3.51/2 15 37 4.03/4 20 38 4.01 25 44 4.5

11/4 32 51 5.011/2 40 54 5.52 50 60 6.0

21/2 65 67 6.03 80 73 7.04 100 86 7.05 125 98 7.56 150 98 8.5

Cap dimensions (BS 1740:Part 1) (Continued)

Nominal SizeLength

minThickness

min�

in mm mm mm

PlugsPlug dimensions (BS 1740:Part 1)

Nominal Size

Length of Thread for

Basic Guage

Length, min

Effective Height of Square,

min

Size of Square,approx

Internal Diameter,

max

Thickness of Metal,

min

Fitting Allowance in BS 21

� � � � � �

in mm mm mm mm mm mm turns1/8 6 6.5 6 6 - - 23/41/4 8 9.7 6 9 - - 23/43/8 10 10.1 10 11 - - 23/41/2 15 13.2 10 13 - - 23/43/4 20 14.5 12 14 - - 23/41 25 16.8 12 17 22 4 23/4

11/4 32 19.1 16 22 31 5 23/411/2 40 19.1 16 27 33 5 23/42 50 23.4 19 32 48 5 31/4

21/2 65 26.7 19 37 62 6 43 80 29.8 22 37 73 8 44 100 35.8 25 46 97 10 41/25 125 40.1 29 51 120 12 56 150 40.1 32 60 145 12 5

7-34



Hexagonal Bushes and Nipples - BS 1740

Hexagonal bush dimensions (BS 1740:Part 1)

Nominal Size

Minimum Length of External Thread for Basic Gauge Length plus Die Clearance,

min

Thickness of Hexagon

Overall Lengthmin

Width Across Flats of Hexagon

� � �

in mm mm mm mm mm1/4 8 12.5 6 18.5 14.03/8 10 12.5 8 20.5 17.01/2 15 17.5 8 25.5 22.03/4 20 19.0 10 29.0 27.01 25 21.0 10 31.0 36.0

11/4 32 24.0 11 35.0 46.011/2 40 24.0 13 37.0 50.02 50 27.0 14 41.0 60.0

21/2 65 32.0 16 48.0 78.03 80 35.0 19 54.0 90.04 100 40.0 22 62.0 115.05 125 45.0 25 70.0 140.06 150 45.0 25 70.0 166.0

Hexagonal nipple dimensions (BS 1740:Part 1)

Nominal size

Minimum Length of

External Thread for Basic Gauge Length plus Die Clearance, min

Thickness of Hexagon

Overall Length min

Diameter of Boremax

Width Across Flats of

Hexagon

� � � �

in mm mm mm mm mm mm1/8 6 9.5 6 25 5.5 12.01/4 8 12.5 6 31 6.5 14.03/8 10 12.5 8 33 9.5 17.01/2 15 17.5 8 43 12.5 22.03/4 20 19.0 10 48 19.0 27.01 25 21.0 10 52 25.0 36.0

11/4 32 24.0 11 59 32.0 46.011/2 40 24.0 13 61 38.0 50.02 50 27.0 14 68 51.0 60.0

21/2 65 32.0 16 80 64.0 78.03 80 35.0 19 89 76.0 90.04 100 40.0 22 102 100.0 115.05 125 45.0 25 115 125.0 140.06 150 45.0 25 115 150.0 166.0

Hexagonal Bushes Hexagonal Nipple

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