一、英制螺纹( 螺纹牙型角 55 度) Thread of British standard ( Thread pitch shape an gle 55 °) BSW ----英国标准惠氏螺纹(粗牙) British Standard Whitworth Thread (C oarse ) BSF ----英国标准惠氏螺纹(细牙) British Standard Whitworth Thread ( Fi ne )G ----直管螺纹( 外螺纹分 A、B 两面级、丝锥分 G、G-D) Straight pipe thr ead ( Outside ) thread in A\B: taps inG、G-D) R ----锥管外螺纹( 旧代号 ZG;KG ) Outside paper pipe thread ( Old thread code ZG,KG ) RC ----锥管内螺纹( 旧代号 ZG;KG ) Inside taper pipe thread ( Old thread code ZG,KG )二、美制螺纹( 螺纹牙型角 60 度) Thread of American standard ( Thread pitch shape angle 60 ° UNC ----统一制粗牙螺纹( 代替 NC ) Unified coarse pitch thread ( Instead of NC ) UNF ----统一制细牙螺纹(代替 NF ) Unified fine pitch thread ( Instead of NF ) UNEF ----统一制超细牙螺纹 Unified superfine pitch thread UN -----统一制不变螺距螺纹 Unified thread UNS ----统一制特殊螺纹 Unified Special thread NPT ----一般用途锥管螺纹( 旧代号 Z;K ) Taper pipe thread for general pur pose ( Old thread code Z,K ) NPSC ----管接头直管内螺纹 Internal straight pipe thread for connection NPSM ----设备上自由配合, 机械连接用直管螺纹 Straight pipe thread for ge neral purpose NPTF ----干密封锥管螺纹 Dryseal taper pipe thread NPSF ----干密封燃油直管螺纹 Dryseal straight pipe internal thread NGT ----气瓶用锥螺纹 Special thread for gas cylinder 三、米制螺纹 Metric thread ZM -----米制锥管螺纹 Metric taper pipe thread 四、其它螺纹 Other threads SM ----缝纫机螺纹 Thread for sewing machine PZ ----气瓶用锥螺纹 Special thread for gas cylinder 5V1 - 20V1 -气门芯螺纹 5V1 - 20V1 - Tyre valve thread 螺纹代号说明示例:
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