ASME_Y14.5-2009DimensioningandTolerancing

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A N I N T E R N A T I O N A L S T A N D A R D

ASME Y14.5-2009

[Revision of ASME Y14.5M-1994 (R2004)]

Dimensioning

and Tolerancing

Engineering Drawing and Related

Documentation Practices

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Date of Issuance: March 27, 2009

This Standard will be revised when the Society approves the issuance of a new edition. There will be no addenda or

written interpretations of the requirements of this Standard issued to this edition.

Periodically certain actions of the ASME Y14 Committee may be published as Cases. Cases are published on the

ASME Web site under the Committee Pages at http://cstools.asme.org as they are issued.

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The American Society of Mechanical Engineers

Three Park Avenue, New York, NY 10016-5990

THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS

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Not for Resale, 05/07/2009 00:24:44 MDT

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iii

CONTENTS

Foreword .............................................................................................................................................................................. vi

Committee Roster ................................................................................................................................................................ viii

Correspondence With the Y14 Committee ...................................................................................................................... ix

Section 1 Scope, Definitions, and General Dimensioning ...................................................................................... 1

1.1 Scope ................................................................................................................................................................ 1

1.2 References ....................................................................................................................................................... 1

1.3 Definitions ...................................................................................................................................................... 2

1.4 Fundamental Rules ........................................................................................................................................ 7

1.5 Units of Measure ............................................................................................................................................ 8

1.6 Types of Dimensioning ................................................................................................................................. 9

1.7 Application of Dimensions .......................................................................................................................... 10

1.8 Dimensioning Features ................................................................................................................................. 13

1.9 Location of Features ...................................................................................................................................... 20

Section 2 General Tolerancing and Related Principles .......................................................................................... 24

2.1 General ............................................................................................................................................................ 24

2.2 Direct Tolerancing Methods ......................................................................................................................... 24

2.3 Tolerance Expression ..................................................................................................................................... 25

2.4 Interpretation of Limits ................................................................................................................................. 26

2.5 Single Limits ................................................................................................................................................... 26

2.6 Tolerance Accumulation ............................................................................................................................... 26

2.7 Limits of Size .................................................................................................................................................... 27

2.8 Applicability of Modifiers on Geometric Tolerance Values and Datum Feature References ............. 29

2.9 Screw Threads ................................................................................................................................................ 31

2.10 Gears and Splines .......................................................................................................................................... 31

2.11 Boundary Conditions .................................................................................................................................... 31

2.12 Angular Surfaces ........................................................................................................................................... 31

2.13 Conical Tapers ................................................................................................................................................ 35

2.14 Flat Tapers ....................................................................................................................................................... 35

2.15 Radius .............................................................................................................................................................. 36

2.16 Tangent Plane ................................................................................................................................................. 36

2.17 Statistical Tolerancing ................................................................................................................................... 36

Section 3 Symbology .............................................................................................................................................. 38

3.1 General ............................................................................................................................................................ 38

3.2 Use of Notes to Supplement Symbols ........................................................................................................ 38

3.3 Symbol Construction ..................................................................................................................................... 38

3.4 Feature Control Frame Symbols .................................................................................................................. 44

3.5 Feature Control Frame Placement ............................................................................................................... 46

3.6 Definition of the Tolerance Zone ................................................................................................................. 46

3.7 Tabulated Tolerances ..................................................................................................................................... 46

Section 4 Datum Reference Frames ........................................................................................................................ 48

4.1 General ............................................................................................................................................................ 48

4.2 Degrees of Freedom ....................................................................................................................................... 48

4.3 Degrees of Freedom Constrained by Primary Datum Features

Regardless of Material Boundary ............................................................................................................ 48

4.4 Constraining Degrees of Freedom of a Part ............................................................................................... 48

4.5 Datum Feature Simulator ............................................................................................................................. 53

4.6 Theoretical and Physical Application of Datum Feature Simulators ..................................................... 53

4.7 Datum Reference Frame ............................................................................................................................... 53

Provided by IHS under license with ASME

Licensee=FMC Technologies /5914950002

Not for Resale, 05/07/2009 00:24:44 MDT

No reproduction or networking permitted without license from IHS

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