NES D1402-2001-米制螺纹标准-eng.pdf

NissanEngineeringStandard

StandardPartsforAutomobilesUDC621.882.082

NESMetricScrewThreads

ThisStandardistheNESpreparedbasedonISO724issuedasNo.2editionin1993,ISO68issuedasNo.

1editionin1973,ISO261issuedasNo.1editionin1973,ISO262issuedin1973andISO9651/2issued

asNo.2editionin1980.PartofthestandardwaschangedforactualconditionsinNissanandRenault.The

areaswithunderlinesaredifferentfromtheoriginalinternationalstandard.

1.SCOPE

ThisStandardspecifiesbasicprofiles,basicdimension,seriesandgradesofmetricscrewthreads.

Themetricthreadspecificationnotshownintheoriginalinternationalstandardshallbeinaccordancewith

theAppendix.

Reference

ThematerialandthesurfacetreatmentspecifiedinthisStandardshallsatisfyandcorrespondtothosein

theFlowofstudyshowninNESM0301“SubstanceUseRestrictions”.Refertothecorresponding

sectionsofNESM0301asrequired.

2.SERIESOFMETRICSCREWTHREADS

Thethreadsshallbeclassifiedintotwoseries,namelycoarsethreadsandfinethreadsinaccordancewith

thecombinationofnominalsizeornominaldiameterandthepitchofmetricscrewthreads.These

combinationsaregiveninAttachedTables1and2.

3.BASICPROFILE,FORMULAANDBASICDIMENSIONS

3.1BasicprofileThebasicprofileisshowninFigure1.

Figure1Basicprofile

3.2Formula

Theformulatocalculatethebasicdimensionsshallbeasfollows:

HeightofbasictriangleH=0.866025P

HeightofengagementH1=0.541266P

Pitchdiameterofexternalthreadd2=d-0.649519P

M