2005_2015.pdf

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 STANDARDThree 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 Society of Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the criteria for American NationalStandards.The Standards Committee that approved the code or standard was balanced to assure that individuals fromcompetent and concerned interests have had an opportunity to participate.The proposed code or standard was madeavailableforpublicreviewandcommentthatprovidesanopportunityforadditionalpublicinputfromindustry,academia,regulatory agencies,and the public-at-large.ASME does not“approve,”“rate,”or“endorse”any item,construction,proprietary device,or activity.ASME does not take any position with respect to the validity of any patent rights asserted in connection with anyitems mentioned in this document,and does not undertake to insure anyone utilizing a standard against liability forinfringement of any applicable letters patent,nor assumes any such liability.Users of a code or standard are expresslyadvised that determination of the validity of any such patent rights,and the risk of infringement of such rights,isentirely their own responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not to be interpreted asgovernment or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the establishedASME procedures and policies,which precludes the issuance of interpretations by individuals.No part of this 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 reservedPrinted 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.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 and 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 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.197.2Designation 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.207.9Designation 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 Allowance 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.3410Lead 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