Drafting Symbols - G-W Learning
AutoCAD and Its Applications Advanced Reference Material
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
1.5 h
h Diameter Radius
2 h
Spherical Radius
Spherical Diameter
90?
Controlled Radius
h
Places or By
h 2
Symmetrical
h Counterbore
0.6 h Countersink
h
60? Depth (or Deep)
h
Dimension Origin
0.5 h
0.5 h
2 h 30?
Taper
1.5 h
15? h
Slope
h h
0.3 h 1.5 h
Square Shape
Reference
2.5 h 30?
0.3 h
Arc Length
h
All Around h = letter height
1.5 h
0.8 h
Statistical Tolerance
Copyright Goodheart-Willcox Co., Inc. May not be reproduced or posted to a publicly accessible website.
Drafting Symbols
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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 tables show how to construct the symbols.
GD&T Symbol Creation
2 h
Identification letter
Optional shoulder
2 h
h
Any needed height
h
Filled or unfilled 60?
Datum Feature Symbol
Target area size (when used)
Form
Straightness Flatness Circularity
2 h
Datum Target number
Datum target symbol Datum target symbol
without area size
with area size
Datum Target Symbol
60?
Movable Datum Target
Symbol
90?
2 h
Target point Target line Target area
Target Point and Target Area
Cylindricity
Profile Location
Profile of a line Profile of a surface Position Concentricity Symmetry
Orientation
Parallelism Perpendicularity
Runout
Angularity
or
Circular runout
or
Total
runout
Geometric Characteristic Symbols
MMC, maximum material condition or MMB, maximum material boundary
RFS, regardless of feature size (no symbol, RFS is assumed unless otherwise specified)
1.5 h
0.8 h
LMC, least material condition or LMB, least material boundary
Material Condition Symbols
Copyright Goodheart-Willcox Co., Inc. May not be reproduced or posted to a publicly accessible website.
Drafting Symbols
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0.8 h Free State
0.8 h
GD&T Symbol Creation
2X 0.4H
Tangent Plane
3 h
1.5 h
Projected Tolerance Zone
Independency
2.5 h
30?
U nequal l y Disposed Pr ofile
0.6 h
0.8 h
1.5 h
Between
Statistical Tolerance
With a dimension
Combined with conventional tolerance
In the feature control frame Statistical Tolerancing Methods
2 h
2 h
h
Feature Control Frame with Straightness Geometric Characteristic Symbol
h = lettering height
Copyright Goodheart-Willcox Co., Inc. May not be reproduced or posted to a publicly accessible website.
Drafting Symbols
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GD&T Symbol Creation
1.5 h
h
h 2h
60?
Feature Control Frame with Flatness Geometric Characteristic Symbol
1.5 h
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
2 h
h
h
Feature Control Frame with Profile of a Line Geometric Characteristic
Symbol and a Datum Reference h = lettering height
Copyright Goodheart-Willcox Co., Inc. May not be reproduced or posted to a publicly accessible website.
Drafting Symbols
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GD&T Symbol Creation
2 h
h
h
Feature Control Frame with Profile of a Surface Geometric Characteristic
Symbol and a Datum Reference
0.6 h
1.5 h
h
2 h
60?
Feature Control Frame with Parallelism Geometric Characteristic
Symbol and a Datum Reference
1.5 h
h
2 h
2 h
Feature Control Frame with Perpendicularity Geometric Characteristic
Symbol and a Datum Reference
30?
h
2 h
1.5 h
Feature Control Frame with Angularity Geometric Characteristic
Symbol and a Datum Reference
h = lettering height
Copyright Goodheart-Willcox Co., Inc. May not be reproduced or posted to a publicly accessible website.
Drafting Symbols
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