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Tel.:[phone]Fax:[e-mail]148-2Plastitealternativetrilobularthreadrollingscrewshaveadeepandnarrow48degreethreadprofilewithextrawidespacingbetweenthreadsandatwinleadthread(seeFig1).Thethreadshaveapitchabouttwicethatofamachinescrewofsamedimensions.Thisthreadprofileimprovesthread-formingandthreadengagementwithintheplastic.Inaddition,thesescrewshavea3-lobetrilobularthreadconfigurationwhichimprovesdisplacementofmaterialintoreliefareasbetweenlobeswhendrivenintoplastic.Thisfurtherincreasestheresistancetovibrationallooseningforceseliminatingtheneedforinsertsand/orlockwashers.Thesespecializedthreadsalsoimprovetheintegrityoftheinternalmatingthreads,whichreducesmaterialfailureandincreasesholdingpowerinplasticmaterials.Theimprovedthreadintegrityalsoreducesstripping,pull-outandpermitsrepeatedremovalandinsertionintothesametappedhole.48-2TrilobularThreadRollingScrews(48-2PlastiteAlternative)48-2trilobularthreadrollingscrewsaresuitablealternativesto48-2Plastitescrews.LiketheirPlastitecounterparts,theyaretrilobularthread-rollingscrewswithaspecializedthreadconfigurationspecificallydesignedforuseinplastics.ForOptimalGripScrewsforPlasticsTel.:1-800-479-0056Fax:[e-mail]ntandtwinleadthreadoffersquickerandmoreeffectivescrewpenetrationintothesubstrate.Thetwinleadthreadpenetratesthesubstrateabouttwiceasfastasafastenerwithcomparablepitchandsingleleadthread.Thethreelobeddesignofthetrilobularthreadwithfullreliefofthethreadformallowsrecoveryofthesubstrateandfilling-inbetweenthelobeswhenturning.Thesefeaturesdecreasethedrivingforceneededduringpenetrationofthescrew.Thetypesandgradesofplasticsvarygreatlyasdotherequirementsforspecificapplications(eg.depthofengagementandmanufacturingspecifics).Forthisreasonitisessentialtofirstestablishtheidealsizeofthepilotholeforeachapplication.Recommendedpilotholesizesfor48-2plastitealternativescrewsofgivendiametersareavailableinthetable1.EasiertoDriveTel.:1-800-479-0056Fax:[e-mail]1DmaxminmaxminSoftDuctileMaterialsBrittleMaterials0-480.06650.06350.06350.0605-0.0480.0562-280.0920.0860.0890.0830.0020.0760.0803-240.1100.1040.1060.1000.0020.0880.0944-200.1270.1210.1230.1170.0020.1000.1066-190.1470.1410.1430.1370.0030.1220.1287-180.1660.1600.1600.1540.0040.1340.1428-160.1850.1790.1790.1730.0040.1490.1589-150.1990.1930.1930.1870.0040.1620.17210-140.2120.2060.2080.2020.0040.1750.18512-110.2350.2290.2300.2240.0050.1950.2061/2-140.2320.2260.2260.2200.0050.1950.2051/4-100.2760.2700.2680.2620.0060.2240.2405/16-90.3450.3360.3350.3250.0060.2860.303RecommendedPilotHoleSizesfor48-2TrilobularThreadRollingScrews(PlastiteAlternativeScrews)Tolerencesonlengththru3/4+/-0.030unlessotherwisespecified,alldimensionsareininchesRecommendedPilotHoleSizeMinimumoutofRoundScrewSizeCircumscribingcircleC3/4+/-0.050alllengths+/-0.050AcrossCenter0thru1/4dia1/4diaTel.:1-800-479-0056Fax:[e-mail]:-AISI1022steelorequivalentquenchandtemperedcasehardenedtoRockwellC45min(corehardnessRockwellC28-38)-18-8stainlesssteel(corehardnessRockwellB90-C20)-410austenticstainlesssteel-annealed,quenchandtempered(corehardnessRockwellC34-C42)Plating:Carbonsteelplastitealternativescrewsareavailableinclearzinc,blackzincandblackoxideStainlesssteelplastitealternativescrewshavenoadditionalcoatingSC196SC197PlastiteAlternativeScrews-FlatPhillipsDrivePlastiteAlternativeScrews-FlatPhillipsDriveSteel,BlackOxideFullThreadSteel,ZincFullThread48degreeThreadProfilewith2LeadThreads48degreeThreadProfilewith2LeadThreadsSC198SC199PlastiteAlternativeScrews-FlatTorxDrivePlastiteAlternativeScrews-FlatUndercutSteel,ZincFullThreadPhillipsDriveSteel,ZincFullThread48degreeThreadProfilewith2LeadThreads48degreeThreadProfilewith2LeadThreadsSC200SC201PlastiteAlternativeScrews-FlatUndercutTorxDrivePlastiteAlternativeScrews-PanPhillipsDriveSteel,ZincFullThreadSteel,BlackZincFullThread48degreeThreadProfilewith2LeadThreads48degreeThreadProfilewith2LeadThreadsHeadStyles,Drives,MaterialsandFinishesof48-2TrilobularThreadRollingScrews(48-2PlastiteAlternativeScrews)Tel.:[phone]Fax:[e-mail]202SC203PlastiteAlternativeScrews-PanPhillipsDrivePlastiteAlternativeScrews-PanPhillipsDriveSteel,BlackOxideFullThreadSteel,ZincFullThread48degreeThreadProfilewith2LeadThreads48degreeThreadProfilewith2LeadThreadsSC204SC205PlastiteAlternativeScrews-PanTorxDrivePlastiteAlternativeScrews-PanTorxDriveSteel,BlackZincFullThreadSteel,BlackOxideFullThread48degreeThreadProfilewith2LeadThreads48degreeThreadProfilewith2LeadThreadsSC206SC207PlastiteAlternativeScrews-PanTorxDrivePlastiteAlternativeScrews-TrussPhillipsDriveSteel,ZincFullThreadSteel,ZincFullThread48degreeThreadProfilewith2LeadThreads48degreeThreadProfilewith2LeadThreadsSC208SC209PlastiteAlternativeScrews-HexIndentedWasherPlastiteAlterna