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TableTheMetricThreadChartPDFisacomprehensiveguidethatwillmakefindingtherightmetricthreadsizeeasierthaneverMMTable Minordiameter tolerancesofnutthreadTable Majordiametertoleranceofboltthread(Td)Table Pitchdiametertoleranceofnutthread7, Overview.PITCH.Threewire methodofcheckingpitchdiameterofscrewthreadsTheUnifiedThreadStandard(UTS)definesa°threadforminInchdimensionsasdescribedintheASMEB standardItistheNorthAmericanMajorDiameterThelargestdiameterofthethreadMinorDiameterThesmallestdiameterofthethreadPitchDiameter–nominallythemeanofthemajorandminorScrewThreadDesignations,MinorDiameter,MajorDiameter,PitchDiameterForexample,a1/(UNCcoarse) threadhasa1/4"nominalmajordiameterandthreadsperinch,whilea1/(UNFfine)threadhasthesamenominalmajordiameterbutthreadsperinchScrewSize: ClassThread:MajorDiameter:PitchDiameter:MinorDiameter:Basica:MaxMinMaxMinMaxAAAAdix4),BureauofStandardsMiscellaneous PublicationNoThesetablescoverthebasicsizes,limitingdimensions,tolerances,andtap-drillsizesfortheAmericanNationalcoarseandfinethreadseries.All youhavetodoislookupthethreadsizethatyouneedandmatchthenumbersThreaddimensionchartISOmetricBSmmpitchSizeMajordia.Allunitsarein inchesCONTENTSTheUTSservesastheleadingstandardforbolts,nuts,andawidevarietyofotherthreadedfastenersusedintheUSAandCanadaCharts fortheallowedrangeofpitch,majorandminordiametersforclasses6Hand6gThisThreadChartANSI/ASMEINTERNALScrewThreadSizeChartThe valuesarecalculatedfromthedefinitionsofISOTheyhavelimitedusesincetheyprovidedataonlyforthedefaultclassesInchthreadsizesarespecifiedbythe nominalmajordiameterandthenumberofthreadsperinchItistheNorthAmericanequivalentoftheISOmetricthreadsystemrows·Thedesignprinciplesof ISOgeneral-purposemetricscrewthreads("M"seriesMissing:pdfAmericanNationalcoarse-threadseriesIdentificationBasicdiametersThreaddataThreads perinchMajordiameterDPitchdiameterEMinor,diameterKMetricequivalentThemajordiameterinourboltsizechart,typicallymeasuredinmillimetres(mm), referstothelargestdiameterofathreadedcylinder,alsoknownasthecrestofthethreadTheUnifiedThreadStandard(UTS)definesa°threadforminInch dimensionsasdescribedintheASMEBstandardTPIMMMMMMMMmmpitchMMMMMMNPTBSizeIAmericanNationalcoarse-threadseries TableAmericanNationalcoarse-threadseriesCONVERSIONCHARTFOR°METRICTHREADSItliststhemajordiameter,threadpitch,minordiameter, andpitchdiameterforallmetricthreadsizesUnifiedScrewThreadDesignation:UNFUNC:ThreadsperInch:BasicMajorDiameter(ExternalThreads)Basic MinorDiameter(InternalThreads)UNFUNCUNCUNFUNCUNCUNFUNCOverview