Drafting Sy\mbols 1Copyright Goodheart-Willcox Co., Inc.
May not be reproduced or posted to a publicly accessible website.
2015
Symbols provide a “common language” for drafters all over the world. However, symbols are meaningful only if they are drawn according to relevant standards or conventions. This document describes and illustrates common dimensioning, GD&T, architectural, piping, and electronic symbols.
Recommended ASME Recommended ASME Dimensioning SymbolsDimensioning Symbols
The size of dimensioning symbols is consistent with text height. In the following illustration, H = text height.
AutoCAD and Its Applications BASICSReference Material
Drafting Symbols
H
2H
H H
0.8H
90°H
H
0.3H
H 1.5H
60°
H
H
0.6H0.3H
1.5H
0.5H
2H
0.5H
30°
15°
H H 1.5H
H2
1.5H
60°
1.5H
Diameter Radius SphericalDiameter
SphericalRadius
ControlledRadius
Placesor By
CounterboreSymmetry Line Spotface Countersink Square Shape
Depth or DeepArc Length Dimension Origin Reference
Taper Slope
H = Letter height
All Around All Over
Drafting Sy\mbols 2Copyright Goodheart-Willcox Co., Inc.
May not be reproduced or posted to a publicly accessible website.
Geometric Dimensioning and Geometric Dimensioning and Tolerancing SymbolsTolerancing Symbols
You can create a library of GD&T symbols, use AutoCAD GD&T tools, or use an AutoCAD GD&T font to insert symbols as text. The following tables show examples of GD&T symbols. For complete coverage of GD&T, refer to Geometric Dimensioning and Tolerancing by David A. Madsen and David P. Madsen, published by Goodheart-Willcox.
Anyneededlength
2H
2H
H
H
60°
Datum Target number
Target area size, when used
3.5H
0.3H
0.8H
60°
Datum Feature Symbols
H = Letter height
Datum Target Symbols
H = Letter height
Datum Target Symbol Movable Datum Target Symbol
Drafting Sy\mbols 3Copyright Goodheart-Willcox Co., Inc.
May not be reproduced or posted to a publicly accessible website.
Form
Profile
Location
Orientation
RunoutTotal Runout
Circular Runout
Angularity
Perpendicularity
Parallelism
or
or
Symmetry
Position
Profile of a Surface
Profile of a Line
Cylindricity
Circularity
Flatness
Straightness
Concentricity
Geometric Characteristic Symbols
1.5H
0.8H
H = Letter height
Material Condition andMaterial Boundary Symbols
2H minimum 2H minimum
2H H
Feature Control Frame Symbol
H = Letter height
Drafting Sy\mbols 4Copyright Goodheart-Willcox Co., Inc.
May not be reproduced or posted to a publicly accessible website.
2X 0.4H0.8H
1.5H
0.8H
3H
0.6H
2.5H
0.8H1.5H
30°30°
0.8H1.5H
2.5H
3X 1.5H
Basic Dimension Symbol
H = Letter height
2H H
Additional GD&T Symbols
H = Letter height
FreeState
TangentPlane
ProjectedTolerance
Zone
Independency UnequallyDisposed
Profile
StatisticalTolerance
ContinuousFeature
BetweenTranslation
Drafting Sy\mbols 5Copyright Goodheart-Willcox Co., Inc.
May not be reproduced or posted to a publicly accessible website.
To draw GD&T symbols as text, create a style using the gdt.shx font. Then use the lowercase alphabet to type the symbols. The following table shows the symbol produced by each lowercase letter.
Lowercase Letter Symbol Produced
a
b
c
d
e
f
g
h
i
j
k
l
m
n
o
p
q
r
s
t
u
v
w
x
y
z
Drafting Sy\mbols 6Copyright Goodheart-Willcox Co., Inc.
May not be reproduced or posted to a publicly accessible website.
Architectural SymbolsArchitectural SymbolsThe following table shows basic examples of architectural drafting symbols.
Common Architectural Symbols
Exterior Door
Interior Door
Pocket Door
Bifold Door
Bypass Door
Window
Lighting Outlet
Recessed LightingOutlet
Wall Lighting Outlet
FluorescentLight Fixture
Single ReceptacleOutlet
Duplex ConvenienceOutlet
Triplex ReceptacleOutlet
Special Outlet
Floor SingleReceptacle Outlet
Floor DuplexReceptacle Outlet
Single Pole Switch
3-Way Switch
220VOutlet
WeatherproofOutlet
Thermostat
Doorbell
Fan HangerReceptacle
Clock HangerReceptacle
TV Outlet
Toilet
Wall Hung Toilet
Urinal
Oval Vanity Sink
RectangularVanity Sink
Single Kitchen Sink
Double Kitchen Sink
Water Heater
Shower
Shower w/ Seat
Tub
Washer/Dryer
Range
Refrigerator
Fan
Conduit
Drafting Sy\mbols 7Copyright Goodheart-Willcox Co., Inc.
May not be reproduced or posted to a publicly accessible website.
Piping SymbolsPiping SymbolsThe following table shows basic examples of piping drafting symbols.
Single-Line Piping Symbols
Name Left Side Front Right Side Left Side Front Right Side
ButtweldedScrewed
90° Elbow
45° Elbow
Tee
45° Lateral
Cross
Cap
ConcentricReducer
EccentricReducer
Union
Coupling
Drafting Sy\mbols 8Copyright Goodheart-Willcox Co., Inc.
May not be reproduced or posted to a publicly accessible website.
Electronic SymbolsElectronic SymbolsThe following table shows basic examples of electronic drafting symbols.
Common Symbols for Electrical Diagrams
AmplifierCapacitor, Polarized Microphone
Receiver, Earphone
Resistor, General
Resistor, Adjustable
Resistor, Variable
Transformer, General
Transformer,Magnetic Core
ShieldedTransformer,
Magnetic Core
Auto-Transformer,Adjustable
Circuit Breaker Twin Triode UsingElongated Envelope
Voltage Regulator,also, Glow Lamp
Phototube
Inductor, Winding,Reactor, General
Magnetic CoreInductor
Adjustable Inductor
Ballast Lamp
Fluorescent,2-Terminal Lamp
Incandescent Lamp
Ground
Chassis Ground
Connectors,Jack and Plug
Engaged Connectors
Triode with DirectlyHeated Cathode andEnvelope Connection
to Base Terminal
Pentode UsingElongated Envelope
Antenna,General
Antenna,Dipole
Antenna,Dipole
Antenna,Counterpoise
Battery, LongLine Positive
Multicell Battery
Capacitor,General
Capacitor,Variable