旋轉接頭常用螺紋代號

   螺紋連接的旋轉接頭不同的國家通常標準也會有所不同，下面是志存密封為大家整理了常見

 的一些螺紋標準，大家在選型的時候可以用來參考.

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

             BSW---英國標準惠氏螺紋（粗牙）British Standard Whitworth Thread ( Coarse )

             BSF---英國標準惠氏螺紋（細牙）British Standard Whitworth Thread ( Fine )

             G-----直管螺紋（外螺紋分A、B兩面級、絲錐分G、G－D）Straight pipe thread ( Outside )

                            thread in A\B: taps in G、G－D )

             R-----錐管外螺紋（舊代號ZG;KG）Outside paper pipe thread ( Old thread code  ZG,KG )

             RC----錐管內螺紋（舊代號ZG;KG）Inside taper pipe thread ( Old thread code ZG,KG )

            二、美制螺紋（螺紋牙型角60度）Thread of American standard ( Thread pitch shape angle 60°

            UNC-----統(tǒng)一制粗牙螺紋（代替NC）Unified coarse pitch thread ( Instead of NC )

            UNF-----統(tǒng)一制細牙螺紋（代替NF）Unified fine pitch thread ( Instead of NF )

            UNEF-----統(tǒng)一制超細牙螺紋Unified superfine pitch thread

            UN-----統(tǒng)一制不變螺距螺紋Unified thread

            UNS-----統(tǒng)一制特殊螺紋Unified Special thread

            NPT-----般用途錐管螺紋（舊代號Z;K）Taper pipe thread for general purpose ( Old

                          thread code Z,K )

            NPSC----管接頭直管內螺紋Internal straight pipe thread for connection

            NPSM----設備上自由配合，機械連接用直管螺紋Straight pipe thread for general purpose

            NPTF----干密封錐管螺紋Dryseal taper pipe thread

            NPSF----干密封燃油直管螺紋Dryseal straight pipe internal thread

            NGT-----氣瓶用錐螺紋Special thread for gas cylinder

            三、米制螺紋Metric thread

             ZM-----米制錐管螺紋 Metric taper pipe thread

            四、其它螺紋Other threads

             SM-----縫紉機螺紋Thread for sewing machine

             PZ-----氣瓶用錐螺紋Special thread for gas cylinder

             5V1－20V1－氣門芯螺紋5V1－20V1－Tyre valve thread

            對于旋轉接頭的螺紋螺紋代號說明示例：Explanation of thread code. e. g.

            1/4－20UNC

            1/4－公稱直徑1/4" nominal dia. 1/4"

            20－每寸20牙twenty teeth per inch

            UNC－美標統(tǒng)一制粗牙螺紋unified coarse pitch thread ( American standard