ASME_B1-30-2002.pdf

ASME B1.30-2002(Revision of ASME B1.30M-1992)ASME B1.30-2002(Revision of ASME B1.30M-1992)ASME B1.30-2002(Revision of ASME B1.30M-1992)SCREW THREADS:STANDARD PRACTICEFOR CALCULATINGAND ROUNDINGDIMENSIONSSCREW THREADS:STANDARD PRACTICEFOR CALCULATINGAND ROUNDINGDIMENSIONSSCREW THREADS:STANDARD PRACTICEFOR CALCULATINGAND ROUNDINGDIMENSIONSA N A M E R I C A N N A T I O N A LS T A N D A R DA N A M E R I C A N N A T I O N A LS T A N D A R DCopyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.ANAMERICANNATIONALSTANDARDSCREWTHREADS:STANDARDPRACTICEFORCALCULATINGANDROUNDINGDIMENSIONSASMEB1.30-2002RevisionofASMEB1.30M-1992Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.Date of Issuance:April 25,2003This 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.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 2003 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.CONTENTSForeword.ivCommittee Roster.v1General.12Rounding of Decimal Values.13Calculations From Formulas.24Thread Form Constants.2Tables1Number of Decimal Places Used in Calculations.22Example of External Inch Screw Threads,12-28 UNEF-2A.43Example of Internal Inch Screw Threads,12-28 UNEF-2B.74Example of External Inch Screw Threads,1964-36 UNS-2A.95Example of Internal Inch Screw Threads,1964-36 UNS-2B.126Example of External Metric Screw Threads,M12?1.75-4g6g.147Example of Internal Metric Screw Threads,M12?1.75-6H.168Example of External Metric Screw Threads,M13?0.9-4g6g.189Example of Internal Metric Screw Threads,M13?0.9-6H.2010Thread Form Data.22Nonmandatory AppendixAThread Characteristics Governed by this Standard.23iiiCopyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.FOREWORDThe American National Standards Committee B1 for standardization of screw threads wasorganized in 1920 as sectional Committee B1 under the sponsorship of the American EngineeringStandards Committee(later the American Standards Association,then the United States ofAmerica Standards Institute and as of October 6,1969,the American National Standards Institute,Inc.),withtheSocietyofAutomotiveEngineersandTheAmericanSocietyofMechanicalEngineersas joint sponsors.As a result,a great deal of effort was expended through the years towarddevelopment of several screw thread standards.Recognizing the need to standardize the method of rounding decimal values in the calculationof screw thread dimemsions,the ASME Standards Committee B1 charged Subcommitte