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1、,85UNCUNCUNF……………………,5and63834,5,5821……………………………………………………………………………………1,5UNFUNEF,58471,4852028UNEF………………………………………………………………UNCUNFUNEF,5,5,434381,42,481616UNFUNFUNEFUNEF32321UNC2028UNEF,441121212161216UNF122012UNEF16201628UNEF1628UNEF28UNEF32283228323232UNC16202832withUniform(Constant)Pitc
2、hes88028026202622162218182181UNF88116UNF1620202828UNCUNF16UNEF2832ThreadsperInchdesignationsforexternalthreads.66866812686812166812681216620812166812166208281216620812162081216208121620121620121620162016202020UNC8UNCUNF816UNF1620202828…………………………………………………………………………………………………………………………………………
3、………………………………………00626221621468162146816214681621468121468146814-UN6-UN8-UN12-UN16-UN20-UN28-UN32-UNUNC6UNC6UNC86UNC8126UNC812166UNC81216206UNC81216206812162081216121616cthreadformmaybespecifiedbysubstitutingUNRinplaceofUNinallSeriesdesignationshownindicatestheUNthreadform;however,theUNR…
4、……………………………………………………………………………………24202018181818181818UNEFExtrafineachinery'sHandbook27thEditionUNIFIEDSCREWTHREADS1735bM80……………………………………………………………inches,use16-threadseries.FineUNFinches,use12-threadseries.1621111212SerieswithGradedPitches…Series…………………………………………………………………………………4…………4…………………
5、…………………………………………CoarseUNCCopyright2004,IndustrialPress,Inc.,NewYork,NYBasicMajorDia.Inches0.25000.3125200.3750180.437516280.500014240.562513240.62503212200.68753211200.750032180.81252810180.8750280.937524169241.06251.125014201.18751.250071.3125201.37507121.43751.50006121.5625181.6250612
6、1.6875181.7500121.8125181.875051.9375182.12502.25002.37502.50002.62502.750042.875043.12503.25003.37503.500043.62503.750043.87504alsoareinthe4,6,8,12,and16threadseries.87a)))))))))Sizesshowninparenthesesaresecondarysizes.Primarysizesof4Fordiametersover1Fordiametersover14168162168164168)1
7、6116183161451638716129165811163413167815161)8143)8125)8347)81)8143)8125)8347)8abcForUNRthreadformsubstituteUNRforUNforexternalthreadsonly.SizesNo.orInches020.0600450.0860680.1120560.125010.138040640.16405403234832744140369511(313(75111.0000118112112011222.000022333.000034344.00
