123456789101112131415美國螺紋統一標准公制螺纹ANSI Metric M Profile公制螺纹ISO Metric profile梯ISO Metric Trapezoidal Threads英制自攻Inch Tapping Threads自攻Metric Forming Screw ThreadsNPT for PVC Pipe and FittingNPT管螺纹ISO Pipe ThreadsISO锥ISO Taper日管螺纹JIS Pipe Threads日锥螺纹JIS Taper德锥螺纹Din Taper德锥管螺纹DIN Pipe Taper德管螺纹DIN Pipe Threads