BS 27791986 英制非密封管螺纹BSPWord格式.docx
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BS 27791986 英制非密封管螺纹BSPWord格式.docx
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1986
Specificationfor
LicensedCopy:
AUBUser,na,SunMar2513:
38:
08GMT+00:
002022,UncontrolledCopy,(c)BSI
Pipethreadsfortubesandfittingswherepressure-tightjointsarenotmadeonthethreads(metricdimensions)
UDC621.643.414:
621.882.082.1
CommitteesresponsibleforthisBritishStandard
ThisBritishStandardwasentrustedbythePipingSystemsComponents
StandardsCommittee(PSE/-)toTechnicalCommitteePSE/9,uponwhichthefollowingbodieswererepresented:
BritishHydromechanicsResearchAssociationBritishMalleableTubeFittingsAssociationBritishSteelIndustry
BritishValveManufacturersAssociationLtd.CopperTubeFittingsManufacturers’Association
DepartmentofTradeandIndustry(NationalEngineeringLaboratory)EnergyIndustriesCouncil
EngineeringEquipmentandMaterialsUsers’AssociationGaugeandToolMakers’AssociationInstitutionofCivilEngineersInstitutionofGasEngineers
InstitutionofPublicHealthEngineers
InstitutionofWaterEngineersandScientistsWaterAuthoritiesAssociationWaterCompaniesAssociation
WroughtFittingMakers’Association
ThisBritishStandard,havingbeenpreparedunderthe
directionofthePipingSystemsComponentsStandardsCommittee,waspublishedundertheauthorityoftheBoardofBSIandcomesintoeffecton29August1986BSI12-1998
FirstpublishedDecember1956FirstrevisionApril1973SecondrevisionAugust1986ThefollowingBSIreferencesrelatetotheworkonthisstandard:
CommitteereferencePSE/9Draftforcomment85/75381DCISBN058015212X
Amendmentsissuedsincepublication
Contents
CommitteesresponsibleForeword
Page
Insidefrontcover
ii
11455685788910111213145910111314
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
BSI12-1998
i
Foreword
ThisrevisionofBS2779hasbeenpreparedunderthedirectionofthePipingSystemsComponentsStandardsCommittee.ItsupersedesBS2779:
1973,whichiswithdrawn.
ThisstandardisbasedonandistechnicallyequivalenttothetwoPartsof
ISO228“Pipethreadswherepressure-tightjointsarenotmadeonthethreads”,namelyISOonly.
Foreaseofproduction,ithasbeenfoundconvenienttoreproducethefiguresfromISO228/2-1980forFigure4,Figure5,Figure7,Figure10andFigure11ofthisstandard.
ABritishStandarddoesnotpurporttoincludeallthenecessaryprovisionsofacontract.UsersofBritishStandardsareresponsiblefortheircorrectpliancewithaBritishStandarddoesnotofitselfconferimmunityfromlegalobligations.
Summaryofpages
Thisdocumentcomprisesafrontcover,aninsidefrontcoverpagesiandii,pages1to14,aninsidebackcoverandabackcover.
Thisstanderdhasbeenupdated(seecopyrightdate)andmayhavehad
amendmentsincorporated.Thiswillbeindicatedintheamendmenttableontheinsidefrontcover.
1986
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