The Mechanical
Engineering Handbook




All Geometric Dimensioning and Tolerancing (GD&T) Symbols



arc length

Arc Length

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Angularity

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Circularity

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Concentricity

Concentricity

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Conical Taper

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Continuous Feature

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Controlled Radius

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Counterbore

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Countersink

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Cylindricity

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Datum Feature

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Datum Target

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Depth

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Diameter

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Dimension Origin

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Envelope Principle

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Envelope Requirement

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Feature Control Frame

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Flatness

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Free State Symbol

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Independency

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Least Material Condition (LMC)

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Maximum Material Condition (MMC)

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Multiple Identical Features

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Parting Line

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Parallelism

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Perpendicularity

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Profile of a Surface

Profile of a Surface

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Profile of a Line

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Projected Tolerance Zone

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Radius

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Regardless of Feature Size

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Restrained Condition Note

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Runout

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Spotface

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Square

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Spherical Radius

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Spherical Diameter

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Slope

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Straightness

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Symmetry

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Tangent Plane

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Total Runout

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true-position

True Position

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Unequally Disposed Profile

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