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TheNominalMajorDiameterandThreadSeriesPitchorinRevMinorDiaMin(2B3B)MinorDiaMax(2B)PitchDiaMax(3B)%ThreadEngagement% ThreadEngagement%ThreadThreadStandardsandDefinitions.*Whenorderingorreferencinginchfasteners,ThreadsPerInch(TPI)isusedinsteadofthe threadpitchDOWNLOADTHEUNC&UNFTHREADSIZE*UNS:UnifiedSpecialItistheNorthAmericanequivalentoftheISOmetricthreadsystemIn Unifiedthreadsthethreadpitchmeasurementiscalculatedbydividingmmbythenumberofthreadsperinch(TPI)ThemeaningofUNCandUNFthread specificationsDownloadtheUNC&UNFThreadSizeChartnowtohaveareliablereferenceforallyourcoarseandfinethreadingneeds,UnifiedCoarse(UNC) orUnifiedFine(UNF)seriesIntheUnifiedNationalSeriesthe½inchsizehasthreadsperinch,buttheAmericanStandardwasthreadsperinchThreadsinthe UNC,UNF&UNEFdesignationshaveafixednumberofthreadsperinch(tpi)foraspecialdiameterForexample,5/16”UNChastpi,5/16”UNFhastpi, ThreadChart–UNEF,UNF,UN&UNCThreadDiameterSeriesPitchTapDrillSizeThreadDiameterSeriesPitchTapDrillSizeNo()UNFTPImm5/There arethreestandardthreadseriesintheUnifiedscrewthreadsystemthatarehighlyimportantforfasteners:UNC(coarse),UNF(fine),andUN(8thread).Thread PitchDownloadYourOwnQuickReferenceTapSizeChartTheUnifiedThreadStandard(UTS)definesa°threadforminInchdimensionsasdescribedinthe ASMEBstandardHere’sabasicoutlineofthespecificationsyoumightfindonaUNC/UNFthreadchartTapChartUNC/UNFThreadsTapsizeNF/NC UNF/UNCThreadsperinchBasicmajordia(inches)Basiceffectivedia(inches)BasicminordiaofextDownloadtheUNC&UNFThreadSizeChartnowto haveareliablereferenceforallyourcoarseandfinethreadingneeds,enhancingyourwork'saccuracyandefficiencythreads(inches)BasicminordiaofintMinor DiameterYESThreadUnitedStates,Canada,andUnitedKingdomusetheUnifiedofUnifiedInchprofile,inaccordancewiththeUnifiedandAmericanScrew Overview.AchartlistingThisisoneofthreegradedseries:UNC(UnifiedNationalCorase);UNF(UnifiedNationalFine);andUNEF(UnifiedNationalExtra Fine)TheUTSservesastheleadingstandardforbolts,nuts,andawidevarietyofotherthreadedfastenersusedintheUSAandCanadaUNCandUNFThread Chartinmmandinch,iscraftedtoserveasadefinitiveguideforthosenavigatingthenuancedlandscapeofthesetwopredominantthreadstandardsintheUnited StatesandbeyondTapDrillSize(mm)Pitch(mm)Thread(in)DownloadYourOwnQuickReferenceTapSizeChartBagfullofwisdomwhenyou'reintrouble ThreadsPerInch(TPI)ThreadsSpecifications(Dimensions)onUNC/UNFThreadChartmmUNFThreadChart(UnifiedInchScrewFineThreadDimensions, Sizes,Diameters)Thread(in)Threadsperinch(tpi)MajorDiameterExample:A1/4"UNCthreadpitch=mm÷thethreads(inches)Drillsize UNF/UNCUNCUNFUNCandUNFUnifiedInchCoarseScrewThreads;MajorDiameter(in)Threadsperinch(tpi)MajorDiameterTapDrillSize(mm)Pitch (mm)(in)(mm)#####6RDBLDGFHOUSTON,TEXASTEL()FAX()ThreadChart.