American Threaded Boss
- Size range: 1/8“ to 4” (DN6 to DN100)
- Pressure rating: 3000 lb (SCH160), 6000 lb (XXS)
- Wall thickness range: 1.65 to 8.18 mm (SCH40 carbon steel); 2.41 to 12.70 mm (SCH80 stainless steel)
- Material Types: Carbon Steel, Stainless Steel, Alloy Steel, Super Duplex Steel, Nickel-Based Alloy
- Thread Standard: ASME B1.20.1
- Taper: 1:16
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The American Threaded Boss complies with ASME B16.11 standards, primarily designed to distribute mechanical stress at pipe branch points and prevent root cracking. It is typically manufactured using forging processes, featuring a central opening in the fitting and a thickened shoulder design. It can be used in pipeline sections requiring frequent inspection and maintenance, as well as at valve interfaces.
American Threaded Boss Dimensions
American Threaded Boss Dimensions Specification Chart
| NPS | DN (mm) | Pressure Rating (LB) | Thread type | Temperature(℃) | Min W.T. (mm) | Standards |
| 1/8″ | 6 | 3000, 6000 | NPT | -29~538 | 1.73 | A105 |
| 1/4″ | 8 | 3000, 6000 | NPT | -29~538 | 2.24 | A105/A182 |
| 3/8″ | 10 | 3000, 6000 | NPT | -29~538 | ≈2.31* | A182 F304 |
| 1/2″ | 15 | 3000, 6000 | NPT | -196~800 | 2.77 | A182 F316L |
| 3/4″ | 20 | 3000, 6000 | NPT | -46~343 | 2.87 | A350 LF2 |
| 1″ | 25 | 3000, 6000 | NPT | -29~600 | 3.38 | A182 F51 |
| 1-1/4″ | 32 | 3000, 6000 | NPT | -29~593 | ≈3.56* | A182 F22 |
| 1-1/2″ | 40 | 3000, 6000 | NPT | -29~371 | 3.68 | A106 Gr.B |
| 2″ | 50 | 3000, 6000 | NPT | -29~425 | 3.91 | A105 |
| 2-1/2″ | 65 | 3000, 6000 | NPT | -29~454 | ≈5.16* | A691 Gr.11 |
| 3″ | 80 | 3000, 6000 | NPT | -29~593 | 5.49 | A182 F22 |
| 4″ | 100 | 3000, 6000 | NPT | ≤540 | 6.02 | A335 P91 |
Different Material Application Scenarios
Carbon steel: The primary standard for carbon steel is ASTM A105 steel, which is suitable for non-corrosive media.
Stainless steel: The primary material used is ASTM A182 F316L. Stainless steel has corrosion resistance, making it suitable for use in acidic or alkaline environments. The nickel-chromium alloy material further enhances corrosion resistance.
High-temperature alloy: The material is ASTM A335 Gr. P91, which can be used in high-temperature steam environments (with an ambient temperature of ≤540°C).