1、AN AMERICAN NATIO NAL STANDARDMetric Screw Threads:M ProfileASME B1.13M-2005(Revision of ASME B1.13M-2001)REAFFIRMED 2015FOR CURRENT COMMITTEE PERSONNELPLEASE E-MAIL CSasme.orgIntentionally left blankASME B1.13M-2005(Revision of ASME B1.13M-2001)Metric ScrewThreads:M ProfileAN AMERICAN NATIONAL STAN
2、DARDThree Park Avenue New York,NY 10016Date of Issuance:March 10,2006The next edition of this Standard is scheduled for publication in 2010.There will be no addenda orwritten interpretations of the requirements of this Standard issued to this edition.ASME is the registered trademark of The American
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8、 document 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 EngineersThree Park Avenue,New York,NY 10016-5990Copyright 2006 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights res
9、ervedPrinted in U.S.A.CONTENTSForeword.viCommittee Roster.viii1General.11.1Scope.11.2Interchangeability.11.3References.11.4Acceptability.11.5Reference Temperature.11.6General Symbols.11.7Units.11.8Federal Government Use.12Terminology.22.1Definitions.23Screw Thread Profile.43.1Basic M Thread Profile.
10、43.2Design M Profiles.63.3Crest and Root Forms.64Series of Threads.64.1Standard Coarse Pitch General Purpose and Mechanical FastenerSeries,M Profile.64.2Standard Fine Pitch M Profile Screw Threads.74.3Preferred Sizes.74.4ISO Metric Thread Series.75Allowances and Tolerances.75.1ISO System of Limits a
11、nd Fits as Applied to Screw Threads.75.2Tolerance Grade.115.3Tolerance Position.125.4Allowance/Tolerance Formulas and Tables.125.5Selected Tolerance Classes.125.6Length of Thread Engagement.125.7Circular Runout.125.8Lead and Flank Angle Tolerances.125.9Coated or Plated Threads.126Design Formulas and
12、 Tabulated Values for Allowances and Tolerances.126.1General.126.2Rounding Procedure for Tabulated Values.126.3Allowances(Fundamental Deviations).156.4Length of Thread Engagement.156.5Crest Diameter Tolerances.156.6Pitch Diameter Tolerances.157Designation of Screw Threads.197.1General.197.2Designati
13、on of Standard Screw Threads.19iii7.3Designation of Thread Fit.207.4Designation of Rounded Root External Thread.207.5Designation of Threads Having Modified Crests.207.6Designation of Special Threads.207.7Designation of Multiple Start Threads.207.8Designation of Coated or Plated Threads.207.9Designat
14、ion of Threads With Adjusted Size Limits.208Dimensional Accommodation of Coating or Plating for 60 deg Threads.218.1Introduction.218.2Material Limits for Coated Threads.218.3Dimensional Effects of Coating.218.4External Thread With Allowance Available for Coating.218.5External Thread With No Allowanc
15、e for Coating.238.6Internal Threads.248.7Electrodeposited Coatings.248.8Other Considerations.259Limits of Size.259.1Standard Thread Series.259.2Determination of Size Limits.259.3Formulas for Calculating Limiting Dimensions for M ProfileScrew Threads.259.4Examples of Calculations of Size Limits.3410L
16、ead and Flank Angle Tolerances.3710.1Lead and Flank Angle Acceptance.37Figures1Basic M Thread Profile(ISO 68-1 Basic Profile).42Internal Thread,Design M Profile With No Allowance(FundamentalDeviation)(Maximum Material Condition).53External Thread,Design M Profile With No Allowance(FundamentalDeviation)(Flanks at Maximum Material Condition).54Metric Tolerance System for Screw Threads.65M Profile,External Thread Root,Upper and Lower Limiting Profiles forr min.p0.125P and for Flat Root Form(Shown f
