NPSF & NPSM Pipe Thread Gages
NPSF (Dryseal) straight pipe working gages are used to check size of the straight internal threads intended for assembly with NPTF external threads. A GO and NO GO gage are used to insure the threaded part is within acceptable tolerance.
NPSM straight thread gages are designed for free fitting mechanical joints.
- ANSI/ASME B1.20 specifications
- Members class 2B
- Handles sold separately
Straight thread pipe plug gages require both a Go and NO GO gage and are made to 2B tolerances. The same process is used as working NC or NF gages.