American Threaded Coupling
- Size: NPS 1/8“ to 4”
- Pressure rating: Class 2000/3000/6000
- Wall thickness range: 1.73 mm (NPS 1/8) to 17.12 mm (NPS 4)
- Thread standard: NPT thread (ASME B1.20.1)
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The American Threaded Coupling is a standardized pipe fitting that uses tapered pipe threads (NPT) for pipe connections. Its pressure-bearing capacity is directly related to its wall thickness. The Class 6000 grade NPS 2″ fitting has a wall thickness of 11.13 mm (SCH160). This fitting is manufactured using a forging process. The duplex stainless steel version is resistant to H₂S corrosion environments. The threaded ends allow for ±5° installation deviation. However, it is important to note that pure threaded connections are not recommended for DN > 50 mm. This fitting is widely used in industries such as petroleum and chemicals.
American Threaded Coupling
American Threaded Coupling Dimensions and Pressure
| NPS | DN | 2000LB Thickness(mm) | 3000LB Thickness(mm) | 6000LB Thickness(mm) | Maximum pressure at the thread end |
| 1/8″ | 6 | 1.73 | 2.41 | 3.02 | 2000LB |
| 1/2″ | 15 | 3.73(SCH80) | 5.54(XS) | 7.62 | 3000LB |
| 2″ | 50 | – | 6.93(SCH80) | 11.13(SCH160) | – |
American Threaded Coupling Sealing Performance Test Method- 2025
Sealing Performance Test Method
Helium Mass Spectrometry Leak Detection Standard
Vacuum Blowing Method: Detection limit ≤ 1×10⁻⁹ Pa·m³/s (ASME SEC V Standard)
Pressure Decay Method: Test pressure is 1.5 times the working pressure, held for 15 minutes
Threaded Seal Verification
NPT Threads: Requires 4.5 turns of PTFE sealing tape, tightening torque referenced from ASME B1.20.1
Acceptance Criteria: Class 6000 allows a leakage rate < 0.01 bubbles/minute