公制螺纹与英制螺纹的区别是什么(Whatisthedifference betweenmetricthreadandBritishthread) Metric,inchthreadandAmericanStandardNPT,PT,Gare.NPT pipethreadisNational(American)Pipe ThreadistheabbreviationofAmericanStandard60degreetaper pipethread,usedinNorthAmerica.Nationalstandardcanrefer toGB/T12716-1991PTis Theabbre...