AutoCAD and Its Applications BASICS Reference Material
2012
Drafting Symbols 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 electrical symbols.
Recommended R eco ec om e d d ASME E Dimensioning i e sio i Symbols y b s The size of dimensioning symbols is consistent with text height. In the following illustration, H = text height. 60
°
1.5H
H Diameter
Spherical Radius
Radius
Spherical Diameter
Controlled Radius
Places or By
1.5H 90 2H H 2
H
0.8H
H
Symmetrical Shape
°
H Counterbore
Spotface
H Countersink
Square Shape
H 1.5H
0.3H H H
0.6H 0.3H Arc Length
60
1.5H
°
Depth or Deep
Dimension Origin
Reference
0.5H 30
°
15
2H
°
H
H
1.5H
0.5H Taper
Slope
All Around
All Over
H = Letter height
Copyright by Goodheart-Willcox Co., Inc.
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Geometric o e ri Dimensioning Dim s ni g and a Tolerancing l r n in S Symbolss 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 GoodheartWillcox Company, Inc. 2H
2H
H
Any needed length 60
°
H
H = Letter height Datum Feature Symbols
Target area size, when used 0.8H
3.5H 0.3H Datum
Target number
60
°
H = Letter height Datum Target Symbol
Movable Datum Target Symbol Datum Target Symbols
Copyright by Goodheart-Willcox Co., Inc.
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Straightness Flatness
Form
Circularity Cylindricity Profile of a Line
Profile
Profile of a Surface Position Location
Concentricity Symmetry
Parallelism Orientation
Perpendicularity Angularity
Runout
or
Circular Runout
or
Total Runout
Geometric Characteristic Symbols
1.5H 0.8H H = Letter height Material Condition and Material Boundary Style
2H minimum
2H minimum
H
2H H = Letter height Feature Control Frame Symbol
Copyright by Goodheart-Willcox Co., Inc.
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2H
H H = Letter height Basic Dimension Symbol
2X 0.4H
0.8H
1.5H Free State
Tangent Plane
Projected Tolerance Zone
Independency
Unequally Disposed Profile
3H 0.8H
0.6H
3X 1.5H Translation
Between
2.5H
2.5H
1.5H
0.8H 30
1.5H
0.8H 30
°
Statistical Tolerance
°
Continuous Feature
H = Letter height Additional GD&T Symbols
Copyright by Goodheart-Willcox Co., Inc.
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To draw GD&T symbols as text, create a style using the gdt.shx, GDT_IV25, 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
Copyright by Goodheart-Willcox Co., Inc.
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Architectural rchi e u l Symbols y os The following table shows basic examples of architectural drafting symbols.
Common Architectural Symbols
Exterior Door
Toilet
Water Heater
Wall Hung Toilet Interior Door Shower Pocket Door
Urinal
Bifold Door Oval Vanity Sink Bipass Door Window
Shower w/ Seat
Rectangular Vanity Sink
Lighting Outlet Tub Recessed Lighting Outlet
Single Kitchen
Wall Lighting Outlet Washer/Dryer
Fluorescent Light Fixture Single Receptacle Outlet Duplex Convenience Outlet Triplex Receptacle Outlet Special Outlet Floor Single Receptacle Outlet Floor Duplex Receptacle Outlet
Double Kitchen 220V Outlet Weatherproof Outlet Thermostat Refrigerator Doorbell Fan Hanger Receptacle
Single Pole Switch
Clock Hanger Receptacle
3-Way Switch
TV Outlet
Copyright by Goodheart-Willcox Co., Inc.
Range
Fan
Conduit
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Piping P i g Symbols y b s The following table shows basic examples of piping drawing symbols.
Single-Line Piping Symbols Screwed Name
Left Side
Front
Buttwelded Right Side
Left Side
Front
Right Side
90 Elbow °
45 Elbow °
Tee
45 Lateral °
Cross
Cap Concentric Reducer Eccentric Reducer Union Coupling
Copyright by Goodheart-Willcox Co., Inc.
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Electronic E ec r ni Symbols S m os The following table shows basic examples of electronic drawing symbols.
Common Symbols for Electrical Diagrams Microphone
Capacitor, Polarized Amplifier Circuit Breaker
Twin Triode Using Elongated Envelope
Antenna, General
Receiver, Earphone
Resistor, General Ground Voltage Regulator, also, Glow Lamp
Antenna, Dipole
Resistor, Adjustable Chassis Ground
Antenna, Dipole
Phototube
Resistor, Variable
Connectors, Jack and Plug Inductor, Winding, Reactor, General
Antenna, Counterpoise
Transformer, General
Engaged Connectors Magnetic Core Inductor
Battery, Long Line Positive Adjustable Inductor
Multicell Battery
Triode with Directly Heated Cathode and Envelope Connection to Base Terminal
Transformer, Magnetic Core
Ballast Lamp Shielded Transformer, Magnetic Core
Capacitor, General
Capacitor, Variable
Fluorescent, 2-Terminal Lamp Pentode Using Elongated Envelope
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Incandescent Lamp
Auto-Transformer, Adjustable
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