Symbols provide a “common language” for drafters all over the world. However,
symbols ... dimensioning, GD&T, architectural, piping, and electrical symbols.
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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 ASME Dimensioning Symbols 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
1.5H
Places or By
90° 2H
H 2
H
H
Symmetrical Shape
H
0.8H
Counterbore
Spotface
H Countersink
Square Shape
H 1.5H
0.3H H H
0.6H
0.3H Arc Length
1.5H
60° 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
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Geometric Dimensioning and Tolerancing 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, published by Goodheart-Willcox 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 Target number
Datum
60°
H = Letter height Datum Target Symbol
Movable Datum Target Symbol Datum Target Symbols
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B A S I C S S t u d e n t We b S i t e Straightness Form
Flatness Circularity Cylindricity
Profile
Profile of a Line 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
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B A S I C S S t u d e n t We b S i t e 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
0.8H
1.5H 30°
30° Statistical Tolerance
Continuous Feature H = Letter height
Additional GD&T Symbols
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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.
Drafting Symbols, page 5
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Architectural Symbols The following table show 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
Rectangular Vanity Sink
Lighting Outlet Recessed Lighting Outlet
Shower w/ Seat
Tub 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
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Range
Fan
Conduit
Drafting Symbols, page 6
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Piping Symbols The following table show 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
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Electronic Symbols The following table show 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
Connectors, Jack and Plug
Phototube
Resistor, Variable
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
Ballast Lamp Shielded Transformer, Magnetic Core
Capacitor, General
Capacitor, Variable
Transformer, Magnetic Core
Fluorescent, 2-Terminal Lamp Pentode Using Elongated Envelope
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Incandescent Lamp
Auto-Transformer, Adjustable
Drafting Symbols, page 8