This standard specifies the thread profile, basic dimension, tolerance, marking and gage of the pipe thread (NPT and NPSC) whose thread angle is 60° and screw thread pair itself is sealable.
This standard is applicable to the sealed thread connection of the pipe, valve, pipe joint, cock and other pipeline fittings.
Contents 1 Scope 2 Normative References 3 Terms and Symbols 4 Thread Profile 5 Thread Type and Coordination 6 Basic Dimension and Tolerance of the Taper Pipe Thread(NPT) 7 Basic Dimension and Tolerance of the Cylindrical Internal Thread (NPSC) 8 Effective Thread Length 9 Theory Location of the Chamfer and The Datum Plane 10 Marking 11 Thread Inspection Appendix A (Informative) Thread Working Gauge