GB/T 12716-2011 Translated English of Chinese Standard. (GBT 12716-2011, GB/T12716-2011, GBT12716-2011): Pipe Threads with the Thread Angle of 60 Degrees Where Pressure-Tight Joints are Made on ThreadsThis Standard specifies the thread form, basic size, tolerance, marking and gauge of pipe thread (NPT and NPSC) with sealed thread pair and thread form angle of 60-degree. This Standard is applicable to sealed thread connection for pipe, valve, pipe joint, cock, and other pipe fittings. |
Contents
| 3 | |
Scope | 5 |
Thread Form | 6 |
Thread Type and Conjunction | 8 |
Basic Size and Tolerance of Cylinder Pipe Thread NPT | 9 |
Basic Size and Tolerance of Cylinder Female Thread NPSC | 11 |
Effective Thread Length | 12 |
Chamfer and Theoretical Position of Datum Plane | 13 |
Marking | 14 |
Thread Inspection | 15 |
Appendix A Informative Thread Working Gauge | 16 |
Common terms and phrases
Angle of 60 Basic Size China’s standard Committee for Standardization cylinder female thread Cylinder Pipe Thread depth of truncation diameter and minor diameter diameter diameter of female diameter of male Distribution Position document effective thread length end-face of male Female Thread NPSC Figure A.2 Form of Cylinder form of thread gauge shall conform GB/T gives the thread height and thread lead and flank length range limit deviation Manufacturing Tolerance National Technical Committee Number of Teeth Pipe Thread NPT pitch diameter plug gauge position of datum provisions of Table refer to Figure Screw Threads sealing performance sizes of thread small end-face Table A.4 taper female thread taper male thread taper pipe thread taper thread Teeth n theoretical position Thread Crest Depth thread crest height thread feature code thread gauge thread markings thread pitch thread root height thread size code thread tooth form thread working gauge thread’s major diameter Tolerance of thread