GB197-81标准（英文版）

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1、.NationalStandardofthePeople’sRepublicofChinaGB197-81Generalpurposescrewthreads--TolerancesandfitsreplacesGB197-63;(diameterfrom1to355mm)GB964-67ThisstandardisapplicabletothethreadstipulatedinGB192-81Generalpurposescrewthreads--Basicconceptsandsymbolsfortoothsha

2、pesandtolerancezoneandGB-81Generalpurposescrewthreads--Diametersandpitches.Thisstandardspecifiestheminimumclearanceofthreadfitaszeroandthreadtoleranceandfundamentaldeviationtoguaranteetheclearance.I.Threadtolerancerangeandlengthofthreadengagement1.Threadtoleranc

3、ezoneiscomposedofthepositioninrelationtobasicprofileanditssize(seeFigure1).Figure1ThreadToleranceZoneT-tolerance;ES-internalthreadupperdeviation;EI-internalthreadlowerdeviation;Es-externalthreadupperdeviation;ei-externalthreadlowerdeviation2.Thepositionofthreadt

4、olerancezoneisdecidedbyfundamentaldeviation.Thisstandardspecifiesthatexternalthreadupperdeviation(es)andinternalthreadlowerdeviation(EI)asfundamentaldeviation.ItisspecifiedGandHtwokindsofposition(seeFigure2)forinternalthread.Anditisspecifiede,f,gandhfourkindsofp

5、osition(seeFigure3)forexternalthread.ThefundamentaldeviationofHandharezero;thefundamentaldeviationofGispositivevalue,fundamentaldeviationofe,f,andgarenegativevalue.ValueoffundamentaldeviationstipulatedinTable1.IssuedbyChinaStateBureauofStandardsImplementedonJan.

6、01,1983ProposedbyFirstMechanicalIndustryDepartmentofChinaDraftedbyStandardizationinstituteofFirstMechanicalIndustryDepartmentGB197-8116BasicprofileBasicprofileFigure2PositionofInternalThreadToleranceZoneTD1-toleranceofinternalthreadminordiameter;TD2-toleranceofi

7、nternalthreadmediandiameter;BasicprofileBasicprofileThemaximumminordiameterThemaximumminordiameterFigure3PositionofExternalThreadToleranceZoneTd-toleranceofexternalthreadmajordiameter;Td2-toleranceofexternalthreadmediandiameter;Internalthreadfundamentaldeviation

8、μmTable1PitchpmmfundamentaldeviationinternalthreadD2、D1externalthreadd、d2GEIHEIeesfesgeshes0.20.250.3+17+18+18000-------17-18-180000.350.40.45+19+19+20000----34-34-35