旋转接头常用螺纹代号

   螺纹连接的旋转接头不同的国家通常标准也会有所不同，下面是志存密封为大家整理了常见

 的一些螺纹标准，大家在选型的时候可以用来参考.

   一、英制螺纹（螺纹牙型角55度）Thread of British standard ( Thread pitch shape angle 55°)

             BSW---英国标准惠氏螺纹（粗牙）British Standard Whitworth Thread ( Coarse )

             BSF---英国标准惠氏螺纹（细牙）British Standard Whitworth Thread ( Fine )

             G-----直管螺纹（外螺纹分A、B两面级、丝锥分G、G－D）Straight pipe thread ( Outside )

                            thread in A\B: taps in G、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-----般用途锥管螺纹（旧代号Z;K）Taper pipe thread for general purpose ( 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 general 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

            对于旋转接头的螺纹螺纹代号说明示例：Explanation of thread code. e. g.

            1/4－20UNC

            1/4－公称直径1/4" nominal dia. 1/4"

            20－每寸20牙twenty teeth per inch

            UNC－美标统一制粗牙螺纹unified coarse pitch thread ( American standard