The Geometrical Tolerancing Desk Reference: Creating and Interpreting ISO Standard Technical Drawings

Chapter 4: Symbols

Table 4.1: Geometrie characteristic symbols

Features

Tolerance type

Characteristic

Symbol

Page

For single features (not related to a datum)

Form

Cylindricity

89

Flatness

90 to 92

Profile of a line

120 to 124

Profile of a surface

125 to 128

Roundness (Circularity)

129 to 133

Straightness

134 to 141

For related features (related to a datum)

Orientation (also called Attitude)

Angularity

68 to 74

Parallelism

93 to 102

Perpendicularity (Squareness)

103 to 111

Profile of a line

120 to 124

Profile of a surface

125 to 128

Location

Concentricity

87 to 88

Coaxiality

84 to 86

Profile of a line

120 to 124

Profile of a surface

125 to 128

Position [*]

112 to 119

Symmetry

142 to 147

Run-out (also called Composite)

Circular run-out

75 to 83

Total run-out

148 to 151

[*]May also not be related to a datum.

Table 4.2: Symbols for geometrical tolerancing

Symbol on the drawing

Description

Interpretation

Tolerance frame (also known as a feature control frame)

Multiple tolerance frames

Toleranced feature indicator

Datum indicator

Tolerance for an AXIS or a MEDIAN PLANE

Table 4.3: Symbols for geometrical tolerancing

Symbol on the drawing

Description

Interpretation

Datum is an AXIS or MEDIAN PLANE

Tolerance for a SURFACE or GENERATOR LINE

Datum is a SURFACE or GENERATOR LINE

Toleranced feature indicator

Table 4.4: Symbols for geometrical tolerancing

Symbol on the drawing

Description

Interpretation

Datum target

Symbol on the drawing

Description

Symbol on the drawing

Description

Datum target point

Datum target line (front view)

Symbol on the...

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