American Threaded Cap
- Size range: NPS 1/8“ to 4” (DN6 to DN100)
- Pressure rating: 2000 lb/3000 lb/6000 lb
- Wall Thickness Gradient: 1.73 mm (1/8“) to 6.02 mm (4”)
- Thread Standard: ASME B1.20.1 NPT, thread angle 60°
Firemins offers quality pipes and fittings, please contact us for a detailed quotation.
The primary function of the American Threaded Cap is to seal the pipeline system at the pipeline terminal. The thread design enhances sealing performance. The primary manufacturing process is forging, which ensures sealing integrity while also increasing the product’s pressure-bearing capacity. The American Threaded Cap fittings are available in multiple material options, allowing selection based on different application scenarios.
American Threaded Cap Specification
American Threaded Cap Size Charts
Based on ASME B16.11 standard
| NPS | DN (mm) | O.D. (mm) | W.T. (mm) | Hexagon head size (mm) | Temperature(LB) |
| 1/8″ | 6 | 10.29 | 1.73~2.41 | 11 | 3000/6000 |
| 1/4″ | 8 | 13.72 | 2.24~3.02 | 14 | 3000/6000 |
| 3/8″ | 10 | 17.15 | 2.31~3.20 | 17.5 | 3000/6000 |
| 1/2″ | 15 | 21.34 | 2.77~3.73 | 22 | 3000/6000 |
| 3/4″ | 20 | 26.67 | 2.87~3.91 | 27 | 3000/6000 |
| 1″ | 25 | 33.4 | 3.38~4.55 | 34 | 3000/6000 |
| 1-1/4″ | 32 | 42.16 | 3.56~4.85 | 43 | 3000/6000 |
| 1-1/2″ | 40 | 48.26 | 3.68~5.08 | 50 | 3000/6000 |
| 2″ | 50 | 60.33 | 3.91~5.54 | 60 | 3000/6000 |
| 2-1/2″ | 65 | 73.03 | 5.16~7.01 | 75 | 3000/6000 |
| 3″ | 80 | 88.9 | 5.49~7.62 | 90 | 3000/6000 |
| 4″ | 100 | 114.3 | 6.02~8.56 | 115 | 3000/6000 |
ASME B16.11 Class 2 Tolerance Specifications
Outer diameter tolerance
- NPS 1/8“-2”: ±0.25mm
- NPS 2-1/2“-4”: ±0.38mm
Wall thickness tolerance
- 3000LB grade: +12.5%/-10%
- 6000LB grade: +15%/-8%
Hex Head Dimension Tolerances
- Opposite Side Width: ±0.5mm
- Thickness: ±0.3mm