概括介紹如下：①國(guo)(guo)(guo)際標(biao)(biao)準(zhun)ISO228/1、DIN259，為(wei)內(nei)外(wai)平行螺(luo)(luo)紋(wen)(wen)(wen)，代(dai)號G或PF（BSP.F）；②德國(guo)(guo)(guo)標(biao)(biao)準(zhun)ISO7/1、DIN2999、BS21，為(wei)外(wai)牙(ya)(ya)(ya)錐(zhui)(zhui)形(xing)、內(nei)牙(ya)(ya)(ya)平行螺(luo)(luo)紋(wen)(wen)(wen)，代(dai)號BSP.P或RP/PS；③英國(guo)(guo)(guo)標(biao)(biao)準(zhun)ISO7/1、BS21，內(nei)外(wai)錐(zhui)(zhui)形(xing)螺(luo)(luo)紋(wen)(wen)(wen)，代(dai)號PT或BSP.Tr或Rc；④美(mei)(mei)國(guo)(guo)(guo)標(biao)(biao)準(zhun)ANSI B21，內(nei)外(wai)錐(zhui)(zhui)形(xing)螺(luo)(luo)紋(wen)(wen)(wen)，代(dai)號NPT G（PF）、RP（PS）、Rc（PT）牙(ya)(ya)(ya)型角均為(wei)55°，NPT牙(ya)(ya)(ya)型角為(wei)60°BSP.F、BSP.P及BSP.Tr統稱為(wei)BSP牙(ya)(ya)(ya)。美(mei)(mei)國(guo)(guo)(guo)標(biao)(biao)準(zhun)管(guan)(guan)螺(luo)(luo)紋(wen)(wen)(wen)包(bao)括五種(zhong)：一般用(yong)途的錐(zhui)(zhui)管(guan)(guan)螺(luo)(luo)紋(wen)(wen)(wen)NPT，管(guan)(guan)接(jie)頭用(yong)直管(guan)(guan)內(nei)螺(luo)(luo)紋(wen)(wen)(wen)NPSC，導桿連(lian)接(jie)用(yong)錐(zhui)(zhui)管(guan)(guan)螺(luo)(luo)紋(wen)(wen)(wen)NPTR，機(ji)械連(lian)接(jie)用(yong)直管(guan)(guan)螺(luo)(luo)紋(wen)(wen)(wen)NPSM（自由配合的機(ji)械連(lian)接(jie)）和NPSL（帶鎖緊螺(luo)(luo)母的松配合機(ji)械連(lian)接(jie)）。屬于非(fei)螺(luo)(luo)紋(wen)(wen)(wen)密(mi)封管(guan)(guan)螺(luo)(luo)紋(wen)(wen)(wen)(N：美(mei)(mei)國(guo)(guo)(guo)國(guo)(guo)(guo)家標(biao)(biao)準(zhun)；P：管(guan)(guan)子；T：錐(zhui)(zhui)形(xing)