AutoCAD and Its Applications REFERENCE M AT E R I A L S B A S I C S S t u d e n t We b S i t e Drafting Symbols Symbols 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 Symbols The size of dimensioning symbols varies with text size, but it should be consistent with the height of the text. In the following illustration, h = text height. Standard Dimensioning Symbols h Diameter Radius Spherical Radius 2h 1.5 h Spherical Diameter Countersink 60° Depth (or Deep) 0.5 h Dimension Origin 0.3 h h 0.5 h h h 0.6 h h 2 Counterbore or Spotface Places or By h 90° h Symmetrical Controlled Radius 15° h 2h h 1.5 h 30° Conical Taper Slope Square Shape Reference 2.5 h 1.5 h 30° h 1.5 h 0.3 h Arc Length All Around 0.8 h Statistical Tolerance h = letter height Copyright by Goodheart-Willcox Co., Inc. Drafting Symbols, page 1 AutoCAD and Its Applications REFERENCE M AT E R I A L S B A S I C S S t u d e n t We b S i t e Geometric Dimensioning and Tolerancing Symbols You 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. GD&T Symbol Creation 2h Identification letter Optional shoulder h 2h Any needed height Filled or unfilled 60° h Datum Feature Symbol Straightness Target area size (when used) Form Profile Datum target symbol without area size Circularity Cylindricity 2h Datum Flatness Target number Datum target symbol with area size Profile of a line Profile of a surface Position Location Datum Target Symbol Concentricity Symmetry 90° Parallelism Orientation 2h Angularity Runout Target point Perpendicularity Datum line Target area Target Point and Target Area MMC, maximum material condition or Circular runout Total runout Geometric Characteristic Symbols RFS, regardless of feature size (no symbol, RFS is assumed unless otherwise specified) 1.5 h or LMC, least material condition 0.8 h Material Condition Symbols Copyright by Goodheart-Willcox Co., Inc. Drafting Symbols, page 2 AutoCAD and Its Applications REFERENCE M AT E R I A L S B A S I C S S t u d e n t We b S i t e GD&T Symbol Creation (continued) 1.5 h 0.8 h Free State Tangent Plane Projected Tolerance Zone 2.5 h 3h 30° 0.8 h 0.6 h 1.5 h 0.8 h Between Statistical Tolerance With a dimension Combined with conventional tolerance In the feature control frame Statistical Tolerancing Methods 2h 2h h Feature Control Frame with Straightness Geometric Symbol Copyright by Goodheart-Willcox Co., Inc. h = lettering height Drafting Symbols, page 3 AutoCAD and Its Applications REFERENCE M AT E R I A L S B A S I C S S t u d e n t We b S i t e GD&T Symbol Creation (continued) 1.5 h 0.8 h Free State Tangent Plane Projected Tolerance Zone 2.5 h 3h 30° 0.8 h 0.6 h 1.5 h 0.8 h Between Statistical Tolerance With a dimension Combined with conventional tolerance In the feature control frame Statistical Tolerancing Methods 2h 2h h Feature Control Frame with Straightness Geometric Symbol Copyright by Goodheart-Willcox Co., Inc. h = lettering height Drafting Symbols, page 4 AutoCAD and Its Applications REFERENCE M AT E R I A L S B A S I C S S t u d e n t We b S i t e GD&T Symbol Creation (continued) 1.5 h h h 2h 60° Feature Control Frame with the Flatness Geometric Characteristic Symbol h 1.5 h 2h Feature Control Frame with Circularity Geometric Characteristic Symbol 60° 1.5 h h h 2h Feature Control Frame with Cylindricity Geometric Characteristic Symbol 2h h h Feature Control Frame with Profile of a Line Geometric Characteristic Symbol and a Datum Reference Copyright by Goodheart-Willcox Co., Inc. h = lettering height Drafting Symbols, page 5 AutoCAD and Its Applications REFERENCE M AT E R I A L S B A S I C S S t u d e n t We b S i t e GD&T Symbol Creation (continued) 2h h h Feature Control Frame with Profile of a Surface Geometric Characteristic Symbol and a Datum Reference 0.6 h h 1.5 h 2h 60° Feature Control Frame with Parallelism Geometric Characteristic Symbol and a Datum Reference 1.5 h h 2h 2h Feature Control Frame with Perpendicularity Geometric Characteristic Symbol and a Datum Reference 30° h 2h 1.5 h Feature Control Frame with Angularity Geometric Characteristic Symbol and a Datum Reference Copyright by Goodheart-Willcox Co., Inc. h = lettering height Drafting Symbols, page 6 AutoCAD and Its Applications REFERENCE M AT E R I A L S B A S I C S S t u d e n t We b S i t e GD&T Symbol Creation (continued) 45° 0.8 h h 1.5 h 2h 0.6 h Circular Runout 45° 1.5 h h 2h 1.1 h Total Runout Runout symbols may be drawn open or filled 1.5 h h h 2h Positional Geometric Characteristic Symbol and Tolerance in a Feature Control Frame with Three Datum References 1.2 h h 0.5 h 2h Feature Control Frame with Symmetry Geometric Characteristic Symbol and a Datum Reference Copyright by Goodheart-Willcox Co., Inc. h = lettering height Drafting Symbols, page 7 AutoCAD and Its Applications B A S I C S S t u d e n t We b S i t e REFERENCE M AT E R I A L S To create 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 8 AutoCAD and Its Applications REFERENCE M AT E R I A L S B A S I C S S t u d e n t We b S i t e Other Symbols Various industries have their own sets of standard symbols. The following tables show typical symbols for the architectural, piping, and electrical industries. Common Architectural Symbols Exterior Door Interior Door Pocket Door Toilet Water Heater Wall Hung Toilet Shower Urinal Bifold Door Bipass Door Oval Vanity Sink Shower w/ Seat Window Lighting Outlet Rectangular Vanity Sink Tub Recessed Lighting Outlet Wall Lighting Outlet Single Kitchen Washer/Dryer Fluorescent Light Fixture Single Receptacle Outlet Duplex Convenience Outlet Triplex Receptacle Outlet Special Outlet Floor Single Receptacle Outlet Floor Duplex Receptacle Outlet Single Pole Switch 3-Way Switch Copyright by Goodheart-Willcox Co., Inc. Double Kitchen 220V Outlet Range Weatherproof Outlet Thermostat Refrigerator Doorbell Fan Hanger Receptacle Fan Clock Hanger Receptacle TV Outlet Conduit Drafting Symbols, page 9 AutoCAD and Its Applications REFERENCE M AT E R I A L S B A S I C S S t u d e n t We b S i t e 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. Drafting Symbols, page 10 AutoCAD and Its Applications REFERENCE M AT E R I A L S B A S I C S S t u d e n t We b S i t e Common Symbols for Electrical Diagrams Capacitor, Polarized Amplifier Circuit Breaker Microphone Twin Triode Using Elongated Envelope Receiver, Earphone Antenna, General Ground Antenna, Dipole Voltage Regulator, also, Glow Lamp Chassis Ground Resistor, General Resistor, Adjustable Phototube Antenna, Dipole Antenna, Counterpoise Connectors, Jack and Plug Engaged Connectors Battery, Long Line Positive Multicell Battery Magnetic Core Inductor Adjustable Inductor Triode with Directly Heated Cathode and Envelope Connection to Base Terminal Pentode Using Elongated Envelope Copyright by Goodheart-Willcox Co., Inc. Resistor, Variable Transformer, General Transformer, Magnetic Core Ballast Lamp Fluorescent, 2-Terminal Lamp Capacitor, General Capacitor, Variable Inductor, Winding, Reactor, General Incandescent Lamp Shielded Transformer, Magnetic Core Auto-Transformer, Adjustable Drafting Symbols, page 11