Drafting Symbols - AutoCAD and Its Applications … Drafting Symbols - AutoCAD and Its Applications...

AutoCADand Its Applications

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Drafting SymbolsSymbols provide a “common language” for drafters all over the world.

However, symbols can be meaningful only if they are created according to the relevant standards or conventions. This document describes and illustrates common dimensioning, GD&T, architectural, piping, and electrical symbols.

Standard Dimensioning SymbolsThe size of dimensioning symbols varies with text size, but it should be consis-

tent with the height of the text. In the following illustration, h = text height.

Diameter

Symmetrical

Conical Taper

ArcLength

AllAround

h = letter height

StatisticalTolerance

Slope SquareShape

Reference

Counterboreor Spotface

Countersink Depth(or Deep)

DimensionOrigin

Radius SphericalRadius

SphericalDiameter

ControlledRadius

Placesor By

Standard Dimensioning Symbols

1.5 h 2 h

2 h

0.5 h0.5 h

1.5 h

1.5 h

1.5 h

2.5 h

0.8 h

0.3 h

0.6 h

0.3 h

h

h

h

h h

h h

h

h

90°

60°

30°

30°

15°

h2

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Geometric Dimensioning and Tolerancing SymbolsYou can either create your own library of GD&T symbols, or use one of

AutoCAD’s GD&T fonts to insert the symbols as text. The following table shows how to construct the symbols.

Anyneededheight

h

2 h

h

2 h

60°

2 h

Identification letter

Datum Feature Symbol

Datum Target Symbol

Target Point and Target Area

Material Condition Symbols

Geometric Characteristic Symbols

Optional shoulder

Filled or unfilled

Straightness

Flatness

Circularity

Cylindricity

Profile of a line

Profile of a surface

Position

Concentricity

Symmetry

Parallelism

Perpendicularity

Angularity

Circularrunoutor

or Totalrunout

Runout

Orientation

Location

Profile

Form

Target area size(when used)

Datum

Datum target symbolwithout area size

Datum target symbolwith area size

Target number

2 h

Target point Target areaDatum line

MMC, maximummaterial condition

RFS, regardless of feature size (no symbol,RFS is assumed unless otherwise specified)

LMC, leastmaterial condition

90°

1.5 h 0.8 h

GD&T Symbol Creation

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With a dimension

In the feature control frame

h = lettering height

Combined withconventional tolerance

FreeState

TangentPlane

ProjectedTolerance Zone

Between Statistical Tolerance

Statistical Tolerancing Methods

Feature Control Frame withStraightness Geometric Symbol

0.8 h 1.5 h

2.5 h 30°

1.5 h0.8 h0.6 h

3 h

0.8 h

2 h

2 h

h

GD&T Symbol Creation (continued)

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With a dimension

In the feature control frame


Combined withconventional tolerance

FreeState

TangentPlane

ProjectedTolerance Zone

Between Statistical Tolerance

Statistical Tolerancing Methods

Feature Control Frame withStraightness Geometric Symbol

0.8 h 1.5 h

2.5 h 30°

1.5 h0.8 h0.6 h

3 h

0.8 h

2 h

2 h

h







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h

1.5 h

h 2 h

60°

60°

Feature Control Frame with the FlatnessGeometric Characteristic Symbol

Feature Control Frame with CircularityGeometric Characteristic Symbol

Feature Control Frame with CylindricityGeometric Characteristic Symbol

Feature Control Frame with Profileof a Line Geometric Characteristic

Symbol and a Datum Reference

1.5 h h 2 h


hh1.5 h 2 h

h h

2 h







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2 h

h h

Feature Control Frame with Profileof a Surface Geometric Characteristic


Feature Control Frame with Parallelism Geometric Characteristic


Feature Control Frame with Perpendicularity Geometric Characteristic


Feature Control Frame with Angularity Geometric Characteristic


h 2 h1.5 h

0.6 h

60°

2 h

2 hh1.5 h

h

30°

2 h


1.5 h







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Circular Runout

Total Runout

Positional Geometric CharacteristicSymbol and Tolerance in a Feature Control

Frame with Three Datum References

Feature Control Frame with SymmetryGeometric Characteristic


0.8 h

Runout symbols may be drawn open or filled


1.5 h h 2 h

45°

0.6 h

1.5 h h 2 h

1.1 h

45°

1.5 h

h h 2 h

h

2 h

1.2 h

0.5 h







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To create GD&T symbols as text, create a style using the gdt.shx, GDT_IV�5, or GDT_IV50 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






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Other SymbolsVarious industries have their own sets of standard symbols. The following

tables show typical symbols for the architectural, piping, and electrical industries.

Exterior Door

Interior Door

Pocket Door

Bifold Door

Bipass Door

Window

LightingOutlet

RecessedLightingOutlet

Wall LightingOutlet

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 HungToilet

Urinal

OvalVanitySink

RectangularVanity Sink

Single Kitchen

Double Kitchen

Water Heater

Shower

Shower w/ Seat

Tub

Washer/Dryer

Range

Refrigerator

Fan

Conduit

Common Architectural Symbols






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Name Left Side Front Right Side Left Side Front Right Side

ButtweldedScrewed

Single-Line Piping Symbols

90° Elbow

45° Elbow

Tee

45° Lateral

Cross

Cap

ConcentricReducer

EccentricReducer

Union

Coupling

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Amplifier

Capacitor,Polarized Microphone

Receiver,Earphone

Resistor,General

Resistor,Adjustable

Resistor,Variable

Transformer,General

Transformer,Magnetic Core

ShieldedTransformer,

Magnetic Core

Auto-Transformer,Adjustable

CircuitBreaker

Twin TriodeUsing Elongated

Envelope

Voltage Regulator,also, Glow Lamp

Phototube

Inductor, Winding,Reactor, General

Magnetic CoreInductor

AdjustableInductor

Ballast Lamp

Fluorescent,2-Terminal Lamp

IncandescentLamp

Ground

ChassisGround

Connectors,Jack and Plug

EngagedConnectors

Triode with DirectlyHeated Cathode andEnvelope Connection

to Base Terminal

Pentode UsingElongated Envelope

Antenna,General

Antenna,Dipole

Antenna,Dipole

Antenna,Counterpoise

Battery, LongLine Positive

MulticellBattery

Capacitor,General

Capacitor,Variable

Common Symbols for Electrical Diagrams

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Drafting Symbols - AutoCAD and Its Applications … Drafting Symbols - AutoCAD and Its Applications...

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