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1、SCREWPOINTTYPESTappingScrews(TypeA,AB,B)TypeApoint:Athreadformingscrewforuseinthinmetal.015to.050thick.Usedwithdrilled,punchedornestedholesinsheetmetal,resinimpregnatedplywood,asbestoscombinations,amongothers.Notrecommendedfornewdesign.TypeABpoint:Athreadformingscrewcombininglocati
2、ngpointofTypeAwiththreadsizeandpitchofTypeB.NormallimitationsoftypeBapply.TypeBpoint:Athreadformingscrewforuseinheaviermetal.050to.200thick.Largerrootdiameterwithfinerthreadpitchforlightandheavysheetmetalnon-ferrouscastings,plastics,impregnatedplywoods,asbestoscombinations,andother
3、materials.ThreadCuttingScrews(Type1,17,23,25,F)Type1point:Athreadcuttingscrewwithsinglefluteforgeneraluse.Producesafinestandardmachinescrewthreadforfieldreplacement.Type17point:Athreadcuttingscrewforwoodwithacoarsetappingscrewthreadandaspeciallongsharppointflutedtocapturechips.Type
4、23point:Athreadcuttingscrewinthefinethreadseriesofferingmaximumthreadcuttingareaandexcellentchipclearing,withminimumtighteningtorques.Type25point:Athreadcuttingscrewsimilartotype23pointexceptwithcoarseTypeBthread.Forplasticsandothersoftmaterialswithlargechipclearingandcuttingedges.
5、TypeFpoint:Athreadcuttingscrewwithmachinescrewthreadwithblunttaperedpoint,havingmulti-cuttingedgesandchipcavities.Forheavygaugesheetmetal,alu-minum,zincandleaddiecastings,castiron,brassandplastic.ThreadFormingScrews(TypeC,CA,Tri-Round,Lo-Driv)ScrewsforPlastic(Tri-Round,Round)TypeCp
6、oint:Athreadformingscrewwitheithercoarseorfinepitchmachinescrewthreadandblunttaperedpoint.Eliminateschipsandpermitsreplacementwithstandardscrewinthefield.Higherdrivingtorquerequired.Usableinheavysheetmetalanddiecastings.TypeCApoint:Athreadformingscrewwitheithercoarseorfinepitchmach
7、inescrewthread.SameasTypeCexceptwithaGimletpoint.ThelocatingpointworksbetterthanTypeCwhereholesbetweentwoadjoiningpiecesofsheetmetalmaybesomewhatmisaligned.Tri-Round:Athreadformingscrewinmostlycoarsemachinescrewthreads.Threevertexesperformaroll-formingprocesstoformmatingthreads.Muc
8、hbetterthreadformingthanTy
