2002_2017.pdf

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 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 DREAFFIRMED 2017REAFFIRMED 2017Intentionally left blank ANAMERICANNATIONALSTANDARDSCREWTHREADS:STANDARDPRACTICEFORCALCULATINGANDROUNDINGDIMENSIONSASMEB1.30-2002RevisionofASMEB1.30M-1992Date 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.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.23iiiFOREWORDThe 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 Subcommittee 30 withthe responsibility for producing such a standard.This Standard designated ASME B1.30 was developed only to serve as the basis for roundingof decimal values associated with the computation of screw thread dimensions.The examples and formulas depicted within this Standard are for reference only and arepresentedonly toclarify theroundingprocedures described.When calculatingthedifferent threadcharacteristics for a particular thread form,refer to the appropriate ASME B1 standard for theformulas and methodology of calculation for that thread.This Standard was originally approved as an American National Standard on June 29,1992.This issue updates the 1992 issue and includes:(a)the addition of a note to para.1.2 for the clarification of the use of this Standard for metricapplications;(b)the addition of an exception in para.3.1.3 to the number of decimal places for the allowance2A when