American Threaded Couplet
- Size range: NPS 1/8“-4” (DN6-100mm), expandable up to 6″ (DN150mm)
- Pressure rating: 3000LB/6000LB
- Wall thickness range: 1.73mm (1/8“) to 10.69mm (4”)
- Temperature range: -196°C to 800°C
- Material: Carbon steel, stainless steel, alloy
Firemins offers quality pipes and fittings, please contact us for a detailed quotation.
The American Threaded Couplet is a critical component for pipe connections, with its thread design enabling full engagement between pipes to enhance sealing performance. It offers flexible sizing, customizable up to 6″ (DN150 mm), and multiple material options to accommodate high-temperature, high-pressure, and corrosive environments. During installation, the thread engagement length must reach 1.5 times the standard reference distance, and all procedures must strictly adhere to the ASME PCC-1 specification.
American Threaded Couplet
American Threaded Couplet Size Charts
Based on ASME B16.11 standard
| NPS (in) | DN (mm) | O.D. (mm) | W.T. (mm) | Thread Length (mm) | Hexagon Head Size (mm) | Pressure Pating(LB) |
| 1/8 | 6 | 10.29 | 1.73 | 9.5 | 11 | 3000/6000 |
| 1/4 | 8 | 13.72 | 2.24 | 11 | 14 | 3000/6000 |
| 3/8 | 10 | 17.15 | 2.31 | 12.5 | 17.5 | 3000/6000 |
| 1/2 | 15 | 21.34 | 2.77 | 15 | 22 | 3000/6000 |
| 3/4 | 20 | 26.67 | 2.87 | 17.5 | 27 | 3000/6000 |
| 1 | 25 | 33.4 | 3.38 | 21 | 34 | 3000/6000 |
| 1 1/4 | 32 | 42.16 | 3.56 | 24 | 43 | 3000/6000 |
| 1 1/2 | 40 | 48.26 | 3.68 | 27 | 50 | 3000/6000 |
| 2 | 50 | 60.33 | 3.91 | 31 | 60 | 3000/6000 |
| 2 1/2 | 65 | 73.03 | 5.16 | 37 | 75 | 3000/6000 |
| 3 | 80 | 88.9 | 5.49 | 43 | 90 | 3000/6000 |
| 4 | 100 | 114.3 | 6.02 | 47 | 115 | 3000/6000 |
ASME B16.11 vs MSS SP-83
ASME B16.11 is a standard for forged socket weld and threaded pipe fittings, applicable to pressure piping systems.
The requirements specify forging processes and welding ranges.
Distinguishes pressure ratings.
Core application: pressure piping systems for petroleum, natural gas, and nuclear power.
MSS SP-83 is solely a manufacturing specification for threaded pipe fittings, focusing on the manufacturing specifications for special threaded components such as joints.
The requirements specify the precision and surface treatment of threads.
It does not distinguish between pressure ratings.
Core applications include: general industrial pipelines and construction.