2007_2017.pdf

Screw Thread Gaging Systems for Acceptability:Inch and Metric Screw Threads(UN,UNR,UNJ,M,and MJ)AN AMERICAN NATIO NAL STANDARDASME B1.3-2007(Revision of ASME B1.3M-1992)REAFFIRMED 2017Intentionally left blank ASME B1.3-2007(Revision of ASME B1.3M-1992)Screw ThreadGaging Systemsfor Acceptability:Inch and MetricScrew Threads(UN,UNR,UNJ,M,and MJ)AN AMERICAN NATIONAL STANDARDThree Park Avenue New York,NY 10016Date of Issuance:October 12,2007This Standard will be revised when the Society approves the issuance of a new edition.There willbe no addenda or written interpretations of the requirements of this Standard issued to this edition.PeriodicallycertainactionsoftheASMEB1Committeewill bepublishedasCases.Casesarepublishedon 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 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 madeavailable forpublic review andcomment thatprovides an opportunityfor additional publicinput from industry,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 assume 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 2007 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.ivCommittee Roster.vCorrespondence With the B1 Committee.vi1General.12Reference Documents.13Screw Thread Gages and Measuring Equipment.14Gaging Systems.15Gaging Requirements.26Acceptability.27Designation.3Tables1Screw Thread Gages and Measuring Equipment for External Product ThreadCharacteristics.42Screw Thread Gages and Measuring Equipment for Internal Product ThreadCharacteristics.83Gaging Systems for External Threads.124Gaging Systems for Internal Threads.13iiiFOREWORD(a)The 1986 edition of this Standard was a combination of ANSI B1.3-1979 and ANSIB1.3M-1981.These earlier versions of this Standard were based upon the following instructionsas defined by the B1 Committee at its meeting on October 7,1976,which charged the B1.3Subcommittee with the responsibility of preparing these documents.The Subcommittee was to prepare a catalog of gages and gaging systems so that each gage orgaging system would be defined only in terms of the dimension(s)controlled and so that anymaterial of an editorial nature that could be construed as giving preference to one gage or gagingsystem over another would be eliminated,as outlined in the following three statements:(1)All references to referee gaging methods are to be eliminated from all B1 documents.(2)A catalog of gaging systems is to be prepared by the B1.3 Subcommittee so that anydescription of the gage relates only to the specific dimension(s)it controls.All material of aneditorial nature that could be construed as giving preference will be eliminated.(3)The level of dimensional acceptability shall be determined by the threaded productapplication and specified by American National Standards or other product standards,or byprocurement drawings or documents.Subsequently,the Subcommittee decided to combine these previous standards into one docu-ment and designate it ANSI/ASME B1.3M-1986,Screw Thread Gaging Systems for DimensionalAcceptability Inch and Metric Screw Threads(UN,UNR,UNJ,M,and MJ).(b)The 1992 edition included the following specific changes:(1)elimination of internal snap gages(2)addition of best wire size radius contacts to minimum material thread groove measure-ment gaging(3)clarification of out-of-round indicating gaging in Tables 1 and 2(4)addition of a reference to ASME B46.1,Surface Texture,to p