PSAPEUGEOT–CITRO?NNORMESVEHICULES
B113110
ISOMETRICTHREADSFORGENERALUSE
Page1/7
NOUSERESTRICTION
Thisisatranslation,theFrenchoriginalshallbeusedinallcasesoflitigationDateoftranslation:31/07/2002FOREWORD
ThisnormeisintechnicalconformitywiththeinternationalstandardISO965of1980withtheexceptionofthefollowingpointsconcerningtheexpressionondocuments.-Mandatoryindicationofthepitchvalueinallcases.-Optionalindicationofthetoleranceclassforthreadsincurrentuse.CONTENTS
1.2.3.4.5.
OBJECTANDFIELDAPPLICATIONEXPRESSIONONDOCUMENTSBASICPROFILE
TOLERANCESYSTEMSCHOICEOFTOLERANCES5.1.MEDIUMQUALITY5.2.FINEQUALITY6.THREADSIZELIMITS
6.1.MEDIUMQUALITYFORTHREADSINCURRENTUSE
6.2.MEDIUMQUALITYFORTHREADSWITHTHICKCOATING6.3.FINEQUALITY
7.RECORDSANDREFERENCEDOCUMENTS7.1.RECORDS
7.2.REFERENCEDOCUMENTS7.3.EQUIVALENTTO:7.4.CONFORMSTO:7.5.KEY-WORDS
11233333356888888
1.OBJECTANDFIELDOFAPPLICATION
TheobjectofthisnormeistogivethedimensionallimitsofthreadsadoptedbytheGroup.
ItappliestoISOmetricthreadsoftriangularprofilewithanominaldiameter3to24mminclusiveandproducedwithinthetolerancequalityofthreadedfastenersincurrentuse.Itisnotapplicabletothreadscalled
\forwhichitisnecessarytorefertotheinternationalstandardISO965/1,965/2and965/3.
2.EXPRESSIONONDOCUMENTS
ThethreaddesignationcomprisestheletterMfollowedbythevaluesinmmofthenominaldiameterandpitch,separatedbythesignx.Itiscompletedbythedesignationofthetoleranceclassadopted.Theabsenceofanyindicationmeansthatthetoleranceclassdefinedin§6.1.1or6.1.2mustbeapplied.Example:M10x1,5
M10x1,5–6e
OR:01/10/1981C:04/11/1996Generaluse
PSAPEUGEOT–CITRO?N
ISOMETRICTHREAD–CLASSES-TOLERANCES
B1131102/7
3.BASICPROFILE
Thebasicprofileofthethreaddefinedbelowisthetheoreticalprofilecorrespondingtothebasicdimensions,namely:majordiameter,pitchdiameter,minordiameter.
DdD2d2D1d1PH========majordiameterofinternalthreadmajordiameterofexternalthreadpitchdiameterofinternalthreadpitchdiameterofexternalthreadminordiameterofinternalthreadminordiameterofexternalthreadpitch
heightoffundamentaltriangle
ThevaluesofthebasicprofileareshownintheISO68standard.
ThetolerancesystemsadoptedbytheGroupforeachofthetwoessentialelements,pitchdiameterandcrestdiameterincludetwoadjustmentsofmediumqualitywithfundamentaldeviationandonefinequalitywithoutfundamentaldeviation.
Thedeviationsareappliedtothefollowingbasicdimensions.
*Majordiameter=nominaldiameterOR:01/10/1981C:04/11/1996Generaluse
PSAPEUGEOT–CITRO?N
ISOMETRICTHREAD–CLASSES-TOLERANCES
B1131103/7
4.TOLERANCESYSTEMS
Threadsmaybeproducedinvariousdegreesofaccuracycalled\class\Thetoleranceclassissymbolisedbyafigureandaletter.
ThefigureindicatesthesizeofthetoleranceDEVIATIONinrelationtothebasicprofile.
TheletterindicatesthetolerancePOSITIONinrelationtothebasicprofilewhichcorrespondstopositionHorh.Deviationsmaybe:3–4–5–6–7–8–9.Positions:GorHfornuts,e,gorhforscrews.
Note:Donotconfuseforexample:6H/6g(nut6H,screw6g)withISOsmoothadjustmentssystemH6/g6.5.CHOICEOFTOLERANCES
Thechoicemustbemadeconsideringeachelementofthethreadedassemblyseparately.Theaimistodefinetheinternalorexternalthreadofthepartandnottheconstitutionoftheassembly,whichmustbedeterminedatthedesignstage.
Forthisreason,alltheassemblycombinationsderivingfrom§5.1and5.2areacceptable.Unlessotherwisespecified,toleranceclassesapplytothefinishproductnotcoated.Forcoatedproducts:
Aftercoating,themaximummateriallimitsshallnotatanypointexceedthelimitscorrespondingtopositionHandhrespectively.
TheconditionsforcheckingthedimensionallimitsofcoatedthreadsaredeterminedbynormeB113180.Note:Forstresscalculations,thedeviationabouttheminordiameterofthescrewaregiveninthestandardISO965/3.5.1.MEDIUMQUALITY
Forthreadsincurrentuse,useinpreferencetoleranceclass6Hforthenutand6gforthescrew(see§Mediumqualityforthreadsincurrentuse).
Forthreadswithalengthofengagementgreaterthan2dorwhichreceivearelativelythickcoating,usetoleranceclass6Gforthenutand6eforthescrew(see§Mediumqualityforthreadswiththickcoating).5.2.FINEQUALITY
Forprecisionthreadssubjectedtoahighworkrateorforwhichthereisadangerofloosening,usetoleranceclass4Hforthenutand5h4hforthescrew,i.e.5hforthepitchdiameterand4hforthemajordiameter(see§Finequality).Thisquality,forexceptionaluse,doesnotpermitthedepositofacoating.
6.THREADSIZELIMITS
Fornutsaswellasscrews,theactualrootprofileofthethreadshouldnotatanypointexceedthebasicprofile.ThedefinitionofthethreadrootradiusisgivenbytheinternationalstandardISO965/1.
ThefollowingtablesshowthecurrentthreadlimitsinthequalityclassesretainedbytheGroupforthreadswithorwithoutcoating.Forthisreason,thetoleranceclass6hisnotshown.6.1.MEDIUMQUALITYFORTHREADSINCURRENTUSE6.1.1.THREADINGOFNUT–TOLERANCECLASS:6H
OR:01/10/1981C:04/11/1996Generaluse
PSAPEUGEOT–CITRO?N
ISOMETRICTHREAD–CLASSES-TOLERANCES
B1131104/7
6.1.2.THREADINGOFSCREW–TOLERANCECLASS:6G
OR:01/10/1981C:04/11/1996Generaluse
PSAPEUGEOT–CITRO?N
ISOMETRICTHREAD–CLASSES-TOLERANCES
B1131105/7
6.2.MEDIUMQUALITYFORTHREADSWITHTHICKCOATING6.2.1.THREADINGOFSCREW–TOLERANCECLASS:6G
6.2.2.THREADINGOFSCREW–TOLERANCECLASS6E
OR:01/10/1981C:04/11/1996Generaluse