美制管螺纹标准

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1、AMERICANPIPETHREADS1847AmericanNationalStandardpipethreadsdescribedinthefollowingparagraphsprovidetaperandstraightpipethreadsforuseinvariouscombinationsandwithcertainmodifica-tionstomeetthesespecificneeds.AmericanNationalStandardTaperPipeThreads.—ThebasicdimensionsoftheANSIStandardtaperpipet

2、hreadaregiveninTable4.FormofThread:Theanglebetweenthesidesofthethreadis60degreeswhenmeasuredinanaxialplane,andthelinebisectingthisangleisperpendiculartotheaxis.Thedepthofthetruncatedthreadisbasedonfactorsenteringintothemanufactureofcuttingtoolsandthemakingoftightjointsandisgivenbytheformulas

3、inTable4orthedatainTable1obtainedfromtheseformulas.Althoughthestandardshowsflatsurfacesatthecrestandrootofthethread,someroundingmayoccurincommercialpractice,anditisintendedthatthepipethreadsofproductshallbeacceptablewhencrestandrootofthetoolsorchasersliewithinthelimitsshowninTable1.Table1.Li

4、mitsonCrestandRootofAmericanNationalStandardExternalandInternalTaperPipeThreads,NPTANSI/ASMEB1.20.1-1983(R1992)INTERNALTHREADRootMinimumMaximumHTruncationTruncationMinimumMax.hTruncationMaximumTruncationCrestCrestCrestMinimumMaximumMinimumTruncationTruncationTruncationMaximumTruncationRootEX

5、TERNALTHREADHeightofPipeThread,Truncation,WidthofFlat,F,ThreadshfEquivalenttoTruncationperHeightofSharpInchVThread,HMax.Min.Min.Max.Min.Max.270.032080.029630.024960.00120.00360.00140.0041180.048110.044440.038330.00180.00490.00210.0057140.061860.057140.050710.00240.00560.00270.0064111¤20.0753

6、10.069570.062610.00290.00630.00330.007380.108250.100000.092750.00410.00780.00480.0090Alldimensionsareininchesandaregiventofourorfivedecimalplacesonlytoavoiderrorsincomputations,nottoindicaterequiredprecision.PitchDiameterFormulas:Inthefollowingformulas,whichapplytotheANSIStandardtaperpipethr

7、ead,E0=pitchdiameteratendofpipe;E1=pitchdiameteratthelargeendoftheinternalthreadandatthegagingnotch;D=outsidediameterofpipe;L1=lengthofhand-tightornormalengagementbetweenexternalandinternalthreads;L2=basiclengthofeffectiveexternaltaperthread;andp=p