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