2006_2011.pdf

Pipe Threads,60 deg,General PurposeAN AMERICAN NATIO NAL STANDARDASME B1.20.2M-2006REAFFIRMED 2011FOR CURRENT COMMITTEE PERSONNELPLEASE E-MAIL CSasme.orgIntentionally left blank ASME B1.20.2M-2006Pipe Threads,60 deg,General PurposeAN AMERICAN NATIONAL STANDARDThree Park Avenue New York,NY 10016Date of Issuance:June 15,2007This 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.Periodically,certain actions of the ASME B1 Committee may be published as Cases.Cases arepublished on the ASME Web site under the Committee Pages at http:/cstools.asme.org as they areissued.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 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 2007 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.ivCommittee Roster.vCorrespondence With the B1 Committee.vi1Scope.12Reference and Symbols.13Taper Pipe Thread Form.14Specifications for General Purpose Taper Pipe Threads,NPT.85Specifications for Internal Parallel Threads in Pipe Couplings,NPSC.86Gauges and Gauge Tolerances for Standard Pipe Thread,NPT.87Gauging of Taper Pipe Thread,NPT.118Gauging of NPSC Parallel Pipe Threads.11Figures1Standard Taper Pipe Thread Notation.22Basic Profile of Standard Taper Pipe Thread.33Standard Taper Pipe Threads for Pressure-Tight Joints.54NPT Standard Taper Pipe Thread Plug and Ring Gauges.125Suggested Form of Gauge Thread.126Gauging External Taper Threads With Ring Gauge.127Gauging Internal Taper Threads With Plug Gauge.128Gauging of Chamfered Threads.18Tables1Limits on Crest and Root Truncation of Standard External and InternalTaper Pipe Threads.42Basic Thread Dimensions.63Tolerances on Taper,Lead,and Angle of Pipe Threads,NPT.94Dimensions,Internal Parallel Threads in Pipe Couplings,NPSC.95Basic Dimensions of Plug and Ring Gauges for NPT Threads.136Tolerances for NPT Working Plug and Ring Gauges.147Diameter Equivalent of Variation in Lead for Tools and Gauges.168Diameter Equivalent of Variation in Half Included Angle of Thread forTools and Gauges.17Nonmandatory AppendicesAThe Turns of Engagement Method of Verifying Product Threads.19BTap Drill Sizes.20iiiFOREWORDThis Standard is a metric conversion of the data for NPT inch series taper pipe threads andNPSC inch series straight internal pipe threads.The NPT and NPSC inch threads are includedin ANSI/ASME B1.20.1,Pipe Threads,General Purpose(Inch).Threads and gages delineatedherein are interchangeable with those in ANSI/ASME B1.20.1.Tabulated metric values have beenconverted from values in ANSI/ASME B1.20.1 and rounded in accordance with ASME B1.30,Screw Threads:Standard Practice for Calculating and Rounding Dimensions.Values are givenin millimeters.When compared to values calculated from formulas in this Standard,there may be a differencein the last decimal place but this will not affect interchangeability.The ASME B1 Subcommittee 20prepared this metric Standard in order to encourage global use of the NPT Pipe Thread.For easeof use,both product threads and gauging are contained in this one Standard.NonmandatoryAppendices A and B are informative only and are not considered a part of this Standard.ASME B1.20.2M was