BS 3643-1-2007 ISO metric screw threads Part 1 Pri

BS3643-1:2007ISOmetricscrewthreadsPart1:PrinciplesandbasicdataICS21.040.10NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAWBRITISHSTANDARDLicensedcopy:PONTYPRIDDCOLLEGE,05/01/2008,UncontrolledCopy,©BSIPublishingandcopyrightinformationTheBSIcopyrightnoticedisplayedinthisdocumentindicateswhenthedocumentwaslastissued.©BSI2007ISBN9780580579240ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferenceFME/9Draftforcomment07/30158486DCPublicationhistoryFirstpublishedJune1963Secondedition,March1981Thirdedition,November2007AmendmentsissuedsincepublicationAmd.no.DateTextaffectedBS3643-1:2007Licensedcopy:PONTYPRIDDCOLLEGE,05/01/2008,UncontrolledCopy,©BSI©BSI2007•iBS3643-1:2007ContentsForewordiii1Scope12Normativereferences13Termsanddefinitionsandsymbols14Basicprofile25Generalplan56Basicdimensions87Tolerances–Principlesandbasicdata188Tolerances–Deviationsforconstructionalthreads359Tolerances–Limitsofsizesforhot-dipgalvanizedexternalscrewthreadstomatewithinternalscrewthreadstappedwithtolerancepositionHorGaftergalvanizing5310Tolerances–Limitsofsizesforinternalscrewthreadstomatewithhot-dipgalvanizedexternalscrewthreadswithmaximumsizeoftolerancepositionhbeforegalvanizing55AnnexesAnnexA(informative)Notesforguidance60AnnexB(informative)Examplesofcalculationsoflimitsofsizeformetricscrewthreads65Bibliography68ListoffiguresFigure1–BasicprofileofISOmetricthread3Figure2–Basicdimensions8Figure3–Tolerancepositionswithrespecttozeroline(basicsize)19Figure4–InternalthreadswithtolerancepositionG21Figure5–InternalthreadswithtolerancepositionH22Figure6–Externalthreadswithtolerancepositionse,fandg22Figure7–Externalthreadswithtolerancepositionh23Figure8–Externalrootprofile31FigureA.1–Maximummaterialprofilesforinternalandexternalthreads61FigureB.1–Illustrationoflimitsofsizeforexternalthread(seeExample1)66ListoftablesTable1–Basicprofiledimensions4Table2–Maximumnominaldiameter5Table3–Diameter/pitchcombinations6Table4–Basicdimensions9Table5–Fundamentaldeviationsforinternalthreadsandexternalthreads24Table6–Lengthsofthreadengagement25Table7–Minordiametertolerancesofinternalthreads(TD1)26Table8–Majordiametertolerancesofexternalthreads(Td)27Table9–Pitchdiametertolerancesofinternalthreads(TD2)28Table10–Pitchdiametertolerancesofexternalthreads(Td2)29Table11–Minimumrootradii31Table12–Recommendedtoleranceclassesforinternalthreads32Table13–Recommendedtoleranceclassesforexternalthreads32Table14–Deviations36Table15–Deviationsforhot-dipgalvanizedexternalthreads54Licensedcopy:PONTYPRIDDCOLLEGE,05/01/2008,UncontrolledCopy,©BSIBS3643-1:2007ii•©BSI2007Table16–Externalthreadlimitsfortoleranceclass6az55Table17–Deviationsforinternalthreadstomatewithhot-dipgalvanizedexternalthreads57Table18–Internalscrewthreadlimitsfortoleranceclass6AZ58Table19–Internalscrewthreadlimitsfortoleranceclass6AX59TableA.1–Nominalstressareasforexternalscrewthreads–Coarseseries63TableA.2–Nominalstressareasforexternalscrewthreads–Fineseries64SummaryofpagesThisdocumentcomprisesafrontcover,aninsidefrontcover,pagesitoiv,pages1to68,aninsidebackcoverandabackcover.Licensedcopy:PONTYPRIDDCOLLEGE,05/01/2008,UncontrolledCopy,©BSI©BSI2007•iiiBS3643-1:2007ForewordPublishinginformationThispartofBS3643ispublishedbyBSIandcameintoeffecton30November2007.ItwaspreparedbySubcommitteeSFTSE/1,Screwsandfastenerstechnicalspecificationcommittee,undertheauthorityofTechnicalCommitteeFME/9,Nuts,boltsandaccessories.Alistoforganizationsrepresentedonthiscommitteecanbeobtainedonrequesttoitssecretary.SupersessionThispartofBS3643supersedesBS3643-1:1981,whichiswithdrawn.RelationshipwithotherpublicationsThispartofBS3643isbasedonaseriesofBSISO,andISO,standardsforISOmetricgeneralpurposescrewthreads,eachclause,fromClause4onwards,beingbasedononeBSISO,orISO,asfollows:•Clause4:Basicprofile:BSISO68-1:1998;•Clause5:Generalplan:BSISO261:1998;•Clause6:Basicdimensions:ISO724:1993;•Clause7:Tolerances–Principlesandbasicdata:BSISO965-1:1998;•Clause8:Tolerances–Deviationsforconstructionalscrewthreads:BSISO965-3:1998;•Clause9:Tolerances−Limitsofsizesforhot-dipgalvanizedexternalscrewthreadstomatewithinternalscrewthreadstappedwithtolerancepositionHorGaftergalvanizing:BSISO965-4:1998;•Clause10:Tolerances–Limitsofsizesforhot-dipgalvanizedexternalscrewthreadstomatewithinternalscrewthreadswithmaximumsizeoftolerancepositionhbeforegalvanizing:BSISO965-5:1998.BS3643consistsofthefollowingparts:•Part1:Principlesandbasicdata;•Part2:Specificationforselectedlimitsofsize.BS3643-2specifiesthefundamentaldeviations,tolerancesandlimitsofsizeforthetolerancesclasses4H,5H,6Hand7Hforinternalthreadsand4h,6gand8gforexternalthreadswhereappropriatefor:•acoursepitchserieswiththerange1mmto68mmdiameter;•afinepitchserieswiththerange1mmto33mmdiameter;•aconstantpitchserieswiththerange8mmto300mmdiameter.Licensedcopy:PONTYPRIDDCOLLEGE,05/01/2008,UncontrolledCopy,©BSIBS3643-1:2007iv•©BSI2007InformationaboutthisdocumentThispartofBS3643hasbeenrevisedtobringituptodate.The1981editionofthestandardwasbasedonISO68:1963,ISO261:1973,ISO724:1968,ISO965-1:1980