American Threaded Hex Head Plug
- Size range: NPS 1/8“-4” (DN6-DN100)
- Thread type: NPT thread (1:16 taper)
- Hex head size: 8 mm (NPS 1/8) to 29 mm (NPS 2)
- Pressure rating: Class 2000/3000/6000
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The American Threaded Hex Head Plug is installed at the end of the pipe to achieve sealing via threads. Its rear end features a hexagonal protrusion for quick disassembly. This fitting is primarily used in fire protection systems. For special sealing requirements, dynamic pressure sealing can be achieved using PTFE sealing tape.
American Threaded Hex Head Plug Specification
American Threaded Hex Head Plug Size Charts
NPT thread taper 1:16, thread parameters comply with ASME B1.20.1 standard
| NPS | DN | O.D.(mm) | Hex head size(mm) | Thread | W.T.(mm) | Pressure |
| 1/8 | 6 | 10.29±0.13 | 8.0×8.0 | NPT 1/8 | 1.73~2.24↑ | 3000/6000 |
| 1/4 | 8 | 13.72±0.15 | 10.0×10.0 | NPT 1/4 | 2.11~2.59↑ | 3000/6000 |
| 1/2 | 15 | 21.34±0.20 | 14.0×14.0 | NPT 1/2 | 2.77~3.02↑ | 3000/6000 |
| 1 | 25 | 33.40±0.25 | 19.0×19.0 | NPT 1 | 3.38~4.55↑ | 3000 |
| 2 | 50 | 60.33±0.35 | 29.0×29.0 | NPT 2 | 3.91~5.54↑ | 3000 |
Pressure-Wall Thickness Comparison Table (Partial)
| Pressure(LB) | NPS 1/8 W.T.(mm) | NPS 1/2 W.T.(mm) | NPS 2 W.T.(mm) |
| 2000 | 1.24 | 1.91 | 2.81 |
| 3000 | 1.73 | 2.77 | 3.91 |
| 6000 | 2.24(+29%) | 3.02(+36%) | 5.54(+42%) |