BS 27791986 英制非密封管螺纹BSP.docx

BS 27791986 英制非密封管螺纹BSP.docx

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BS27791986英制非密封管螺纹BSP

BS2779-1986英制非密封管螺纹（BSP）

非密封管螺纹

BRITISHSTANDARD

BS2779:

1986

Specificationfor

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Pipethreadsfortubesandfittingswherepressure-tightjointsarenotmadeonthethreads（metricdimensions）

UDC621.643.414:

621.882.082.1

非密封管螺纹

BS2779:

1986

CommitteesresponsibleforthisBritishStandard

ThisBritishStandardwasentrustedbythePipingSystemsComponents

StandardsCommittee（PSE/-）toTechnicalCommitteePSE/9,uponwhichthefollowingbodieswererepresented:

BritishHydromechanicsResearchAssociationBritishMalleableTubeFittingsAssociationBritishSteelIndustry

BritishValveManufacturersAssociationLtd.CopperTubeFittingsManufacturers’Association

DepartmentofTradeandIndustry（NationalEngineeringLaboratory）EnergyIndustriesCouncil

EngineeringEquipmentandMaterialsUsers’AssociationGaugeandToolMakers’AssociationInstitutionofCivilEngineersInstitutionofGasEngineers

InstitutionofPublicHealthEngineers

InstitutionofWaterEngineersandScientistsWaterAuthoritiesAssociationWaterCompaniesAssociation

WroughtFittingMakers’Association

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ThisBritishStandard,havingbeenpreparedunderthe

directionofthePipingSystemsComponentsStandardsCommittee,waspublishedundertheauthorityoftheBoardofBSIandcomesintoeffecton29August1986BSI12-1998

FirstpublishedDecember1956FirstrevisionApril1973SecondrevisionAugust1986ThefollowingBSIreferencesrelatetotheworkonthisstandard:

CommitteereferencePSE/9Draftforcomment85/75381DCISBN058015212X

Amendmentsissuedsincepublication

非密封管螺纹

BS2779:

1986

Contents

CommitteesresponsibleForeword

Page

Insidefrontcover

ii

11455685788910111213145910111314

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234Symbols

ClassificationanddesignationThreaddetails

threadforclassAexternalthreads

AppendixBNotesontolerancingsystemstructureAppendixCMethodofverificationofthreadsizeandformbymeansoflimitgauges

AppendixDGaugesforthemethodgiveninappendixC

Figure2—SpecialtruncatedexternalthreadFigure3—NOTGOscrewcallipergaugeFigure4—StartofcompletethreadFigure5—Chamferofstartofthread

Figure6—ThreadprofilesofGOringgaugesandtheircheckplugs

Figure7—RelativepositionsofpitchdiametertolerancezonesforGOringgaugesandtheircheckplugs

Figure8—ThreadprofilesofNOTGOringgaugesandtheircheckplugsandcallipergauges

Figure9—RelativepositionsofpitchdiametertolerancezonesforNOTGOringgauges,callipergaugesandtheircheckplugsFigure10—ThreadprofilesofGoandNOTGOpluggauges

Figure11—RelativepositionsofpitchdiametertolerancezonesforGOandNOTGOpluggauges

Table2—Specialtruncatedfasteningthreads,classAexternalthreads

Table3—DimensionsforGOandNOTGOgaugesandtheircheckplugsforclassAexternalthreadsandforGOgaugesandtheircheckplugsforclassBexternalthreadsTable4—OthervaluesforGOandNOTGOgaugesandtheircheckplugsforclassAandclassBexternalthreadsasafunctionofthepitch,P

Table5—DimensionsforNOTGOgaugesandtheircheckplugsforclassBexternalthreads

Table6—DimensionsforthreadedGOandNOTGOpluggaugesTable7—OthervaluesforGOandNOTGOpluggaugesasafunctionofthepitch,P

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i

非密封管螺纹

BS2779:

1986

Foreword

ThisrevisionofBS2779hasbeenpreparedunderthedirectionofthePipingSystemsComponentsStandardsCommittee.ItsupersedesBS2779:

1973,whichiswithdrawn.

ThisstandardisbasedonandistechnicallyequivalenttothetwoPartsof

ISO228“Pipethreadswherepressure-tightjointsarenotmadeonthethreads”,namelyISOonly.

Foreaseofproduction,ithasbeenfoundconvenienttoreproducethefiguresfromISO228/2-1980forFigure4,Figure5,Figure7,Figure10andFigure11ofthisstandard.

ABritishStandarddoesnotpurporttoincludeallthenecessaryprovisionsofacontract.UsersofBritishStandardsareresponsiblefortheircorrectpliancewithaBritishStandarddoesnotofitselfconferimmunityfromlegalobligations.

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Summaryofpages

Thisdocumentcomprisesafrontcover,aninsidefrontcoverpagesiandii,pages1to14,aninsidebackcoverandabackcover.

Thisstanderdhasbeenupdated（seecopyrightdate）andmayhavehad

amendmentsincorporated.Thiswillbeindicatedintheamendmenttableontheinsidefrontcover.

ii

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非密封管螺纹

BS2779:

1986