ASME_B1-20-1-2013.pdf

ASME B1.20.1-2013Revision of ASME B1.20.1-1983(R2006)Pipe Threads,General Purpose(Inch)AN AMERICAN NATIONAL STANDARDSThe American Society ofMechanical EngineersINTENTIONALLY LEFT BLANKASME B1.20.1-2013Revision of ASME B1.20.1-1983(R2006)Pipe Threads,General Purpose(Inch)AN AMERICAN NATIONAL STANDARDThe American Society ofMechanical EngineersTwo Park AvenueNew York,NY10016UsADate of Issuance:November 15,2013This Standard will be revised when the Society approves the issuance of a new edition.There willbe no written interpretations of the requirements of this Standard issued to this edition.Periodically certain actions of the ASME B1 Committee may be published as Cases.Cases are publishedon the ASME Web site under the Committee Pages at http:/cstools.asme.org/as they are issued.Errata to codes and standards may be posted on the ASME Web site under the Committee Pages toprovide corrections to incorrectly published items,or to correct typographical or grammatical errorsin codes and standards.Such errata shall be used on the date posted.The Committee Pages can be found at http:/cstools.asme.org/.There is an option available toautomatically receive an e-mail notification when errata are posted to a particular code or standard.This option can be found on the appropriate Committee Page after selecting Erratain the PublicationInformationsection.ASME is the registered trademark of The American Society of Mechanical EngineersThis 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 for public review and comment that provides an opportunity for additional public input from industry.academia,regulatory agencies,and the public-at-large.ASME does not approve,rate,or endorseany 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 asgovemment or industry endorsement of this code or standard.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 EngineersTwo Park Avenue,New York,NY 10016-5990Copyright2013byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.with ASMECONTENTSForewordCommittee Roster.Correspondence With the B1 Committee.1lntr0 ductic0n.12American National Standard Pipe Thread Form.23Specification for Taper Pipe Threads,NPT.4Specifications for Internal Straight Threads in Pipe Couplings,NPSC.13Specifications for Railing Joint Taper Pipe Threads,NPTR.146Specifications for Straight Pipe Threads for Mechanical Joints;NPSM,NPSL.16Gages and Gage Tolerances for American National Standard Taper PipeThreadSNPT.19FiguresRoot,Crest,and Flank Engagement,NPT.Basic Form of American National Standard Taper Pipe Thread,NPT.33American National Standard Taper Pipe Thread Notation.64Gaging External Taper Threads With Li Ring Gage4105Gaging of Chamfered Threads.116Gaging Internal Taper Threads With L Plug Gage.12NPT Standard Taper Pipe Thread Plug and Ring Gages.208Suggested Form of Gage Thread.21Tables1 Limits on Crest and Root Truncation of American National Standard Externaland Internal Taper Pipe Threads,NPT5Basic Dimensions of American National Standard Taper Pipe Thread,NPT.8Tolerances on Taper,Lead,and Angle of Pipe Threads,NPT.1Dimensions,Internal Straight Threads in Pipe Coupling,NPSC5Dimensions of External and Internal Taper Pipe Threads for RailingJoints,NPTR66Dimensions of External and Internal Straight Pipe Threads for Fixtures,NPSM.171Dimensions,External and Internal Straight Pipe Thread for LocknutConnections,NPSL.188Basic Dimensions of Threaded Gages for American National Standard Taper PipeThreads NPT.229Working Gage Tolerances for American National Standard Taper PipeThread,NPT.2310Diameter Equivalent of Variation in Half Included Angle of Thread for Toolsand Gages2511Diameter Equivalent of Variation in Lead for Tools and Gages.26Nonmandatory AppendicesAThe Turns of Engagement Method of Gaging Product Threads.27BTap Drill Sizes.28CThread Types and Corresponding Gages and Gaging.9inse with ASME