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1、ASME Y14.5-2009Revision of ASME Y14.5M-1994 (R2004)Dimensioning and TolerancingEngineering Drawing and Related Documentation Practices-,-,-A N I N T E R N A T I O N A L S T A N D A R DCopyright ASME InternationalProvided by IHS under license with ASMENo reproduction or networking permitted without l
2、icense from IHSLicensee=FMC Technologies /5914950002 Not for Resale, 05/07/2009 00:24:44 MDTASME Y14.5ADOPTION NOTICEASME Y14.5, Dimensioning and Tolerancing, was adopted on 9 February 2009 for use by the Department of Defense (DoD). Proposed changes by DoD activities must be submitted to the DoD Ad
3、opting Activity: Commander,U.S. Army Research, Development and Engineering Center (ARDEC), ATTN: AMSRD-AAR-QES-E, Picatinny Arsenal, NJ 07806-5000. Copies of this document may be purchased from The American Society of Mechanical Engineers (ASME), 22 Law Drive, P.O. Box 2900, Fairfield, NJ 07007-2900
4、, http:/www.asme.org.Custodians:Adopting Activity:Army ARArmy ARNavy SA(Project DRPR-2009-003)Air Force 16Review Activities:Army CR, IE, MI, PT, TM2Navy AS, CG, CH, EC, MC, NP, TDAir Force 13, 99 DLA DHOSD SE NSA NSOther CM, MP, DC2NOTE: The activities listed above were interested in this document a
5、s 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 http:/assist.daps.dla.mil.AMSC N/AAREA DRPRDISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited
6、.-,-,-Copyright ASME InternationalProvided by IHS under license with ASMENo reproduction or networking permitted without license from IHSLicensee=FMC Technologies /5914950002 Not for Resale, 05/07/2009 00:24:44 MDTASME Y14.5-2009Revision of ASME Y14.5M-1994 (R2004)Dimensioning and TolerancingEnginee
7、ring Drawing and Related Documentation PracticesAN INTERNATIONAL STANDARD -,-,-Date of Issuance: March 27, 2009This 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 thi
8、s 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.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or st
9、andard was developed under procedures accredited as meeting the criteria for American National Standards. The Standards Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate. The proposed cod
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11、s not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable letters patent, nor assumes any such liability
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13、erpreted as government or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the established ASME procedures and policies, which precludes the issuance of interpretations by individuals.No part of this d
14、ocument may be reproduced in any form, in an electronic retrieval system or otherwise,without the prior written permission of the publisher.The American Society of Mechanical Engineers Three Park Avenue, New York, NY 10016-5990Copyright 2009 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights r
15、eserved Printed in U.S.A.-,-,-CONTENTSForewordviCommittee RosterviiiSection 1Scope, Definitions, and General Dimensioning .11.1Scope .11.2References .11.3Definitions .21.4Fundamental Rules .71.5Units of Measure .81.6Types of Dimensioning .91.7Application of Dimensions .101.8Dimensioning Features .13
16、1.9Location of Features .20Section 2General Tolerancing and Related Principles .242.1General .242.2Direct Tolerancing Methods .242.3Tolerance Expression .252.4Interpretation of Limits .262.5Single Limits .262.6Tolerance Accumulation .262.7Limits of Size .272.8Applicability of Modifiers on Geometric
17、Tolerance Values and Datum Feature References .292.9Screw Threads .312.10Gears and Splines .312.11Boundary Conditions .312.12Angular Surfaces .312.13Conical Tapers .352.14Flat Tapers .352.15Radius .362.16Tangent Plane .362.17Statistical Tolerancing .36Section 3Symbology .383.1General .383.2Use of No
18、tes to Supplement Symbols .383.3Symbol Construction .383.4Feature Control Frame Symbols .443.5Feature Control Frame Placement .463.6Definition of the Tolerance Zone .463.7Tabulated Tolerances .46Section 4Datum Reference Frames .484.1General .484.2Degrees of Freedom .484.3Degrees of Freedom Constrain
19、ed by Primary Datum FeaturesRegardless of Material Boundary .484.4Constraining Degrees of Freedom of a Part .484.5Datum Feature Simulator .534.6Theoretical and Physical Application of Datum Feature Simulators .534.7Datum Reference Frame .53Correspondence With the Y14 Committeeix-,-,-iii4.8Datum Feat
20、ures .574.9Datum Feature Controls .584.10Specifying Datum Features in an Order of Precedence .584.11Establishing Datums .594.12Multiple Datum Features .654.13Mathematically Defined Surface .694.14Multiple Datum Reference Frames .694.15Functional Datum Features .694.16Rotational Constraint About a Da
21、tum Axis or Point .704.17Application of MMB, LMB, and RMB to Irregular Features of Size .744.18Datum Feature Selection Practical Application .754.19Simultaneous Requirements .764.20Restrained Condition .794.21Datum Reference Frame Identification .794.22Customized Datum Reference Frame Construction .814.23Application of a Customized Datum Reference Frame .814.24Datum Targets .