ASME Y14.5-2018 尺寸标注和公差(英文版).pdf

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Dimensioning and Tolerancing

EngineeringProductDefinition and RelatedDocumentationPractices

ADOPTIONNOTICE

Department ofDefense (DoD). Proposed changes by DoD activities must be submitted to the DoD ASME Y14.5 Dimensioning and Tolerancing was adopted on 9 February 2009 for use by theAdopting Activity: Commander U.S. Army Research Development and Engineering Centerdocument may be purchased from The American Society of Mechanical Engineers (ASME) 150 (ARDEC) ATTN:AMSRD-AAR-QES-E Picatinny Arsenal NJ 07806-5000. Copics of thisClove Road 6th Floor Little Falls NJ 07424-2139;

Adopting Activity:Ammy--AR(ProjectDRPR-2009-003)

Custodians:Army--ARNavy--SA Air Force -- 16

Review Activities: Army-CR MI PT TMNavy-AS CG CH EC MC NP TDAir Force--13 99 DLA -DHOSD-SENSA-NS Other-CM MP DC2

NOTE: The activities listed above were interested in this document as of the date of this document.Since organizations and responsibilities can change you should verify the currency of the information above using the ASSIST Online database at

AREA DRPR

ASMC NA

Dimensioning and Tolerancing

EngineeringProductDefinitionand RelatedDocumentationPractices

This Standard will be revised when the Society approves the issuance of a new edition.

Periodically certain actions of the ASME Y14 Committe may be published as Cases. Cases are published on the ASME websiteunder the Y14 Committee Page at as they are issued.

so pd o s d d ap qom d uo p q A speis pe sp eeincorrectly published items or tocorrect typographical or grammatical errors in codes and standards. Such errata shallbe used on the date posted.

The Y14 Committee Page can be found at is an option available to automaticallyreceive an e-mail notification when errata are posted to a particular code or standard. This option can be found on the appropriate Committee Page after selecting “Errata* in the “Publication Information” section.

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ASME accepts responsibility for only those interpretations of this document ssued in accordance with the established ASME proceduresand policies which precludes the issuance of interpretations by individuals.

No part of this document may be reproduced in any form without the prior written permission of the publisher. in an electronic retrieval system or otherwise The American Society of Mechanical EngineersTwo Park Avenue New York NY 10016-5990Copyright @ 2019 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERS Allrights reservedPrinted in U.S.AL

CONTENTS

Committee Roster . Foreword A[xXV

Correspondence With the Y14 Committee . xviSection 1 1.1 Scope ... Introduction .......1.2 General ....1.3 1.4 Reference to This Standard . ASME Y14 Series Conventions . .1.5 Drawings Without Reference to a Standard ... 1.6 1.7 Reference to Gaging ... Symbols .....Section 2 References2.1 Introduction Cited Standards 42.3 2 2 Additional Sources (Not Cited) 4 4Section 3 Definitions 5Section 4 4.1 Fundamental Rules Tolerancing Defaults and Dimensioning Practices . Fundamental Rules . 12 124.2 Units of Measure . 134.3 4.4 Types of Dimensioning Application of Dimensions 13 144.5 Dimensioning Features 154.6 Section 5 Tolerancing Interpretation of Limits Limits of Size and Material Condition Modifiers Location of Features 185.1 General .5.2 5.3 Direct Tolerancing Methods Tolerance Expression 345.4 Interpretation of Limits .. 345.5 Single Limit Toleranced Dimensions . . . Tolerance Accumulation Between Surfaces . 35 355.6 5.7 Dimensions Related to an Origin ..... 355.8 Limits of Size . . 355.9 5.10 Applicability of Modiffers on Geometric Tolerance Values and Datum Feature References Screw Threads 36 385.11 Gears and Splines 385.12 5.13 Boundary Conditions Angular Surfaces 38 385.14 Conical Tapers .... 38

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