ASME B16.11 Stainless Steel Socket Weld & Threaded Half Coupling 1/8" to 4" Size Range 3000LBS to 9000LBS Pressure Rating
ASME B16.11 forged stainless steel half couplings for high-pressure applications. Available in socket weld (3000-9000LBS) and threaded (3000-6000LBS) configurations. Features include 1/8" to 4" size range, multiple pressure classes, and galvanized/black/pickled finishes. Ideal for connecting small-bore pipes to large headers in industrial piping systems.
| Product Name | ASME B16.11 Forged Fittings High Pressure Fitting |
|---|---|
| Size Range | 1/8" to 4" |
| Standards | ANSI/ASME B1.20.1 (Thread Type), ASME B16.11 |
| Fitting Type | Socket-Welding (SW) Half Coupling, Threaded (THD) Half Coupling |
| Pressure Class | Threaded End: 3000LBS, 6000LBS Socket Welding End: 3000LBS, 6000LBS, 9000LBS |
| Finish | Galvanized, Black (Carbon), Pickled |
The ASME B16.11 half coupling is a forged fitting designed for connecting small-bore screwed (THD) or socket-weld (SW) pipe to large-bore main run pipes (headers). These couplings feature different construction and functionality compared to full couplings, with only one end furnished with either socket welding or internally threaded structure.
- SW half couplings available in Class 3000, 6000, and 9000 pressure ratings
- Threaded half couplings available in Class 3000 and 6000 pressure ratings
- SW half couplings typically have larger overall length than SW full couplings
- Threaded half couplings measure approximately half the length of threaded full couplings
- Two common installation methods for branch connections
Half couplings can be installed using two primary methods: (1) The half coupling rests on the external surface of the pipe header and is welded from the outside. (2) A hole is bored into the pipe header large enough to accept the OD of the half coupling, which is then inserted and welded.
| NPS | B max. | B min. | J min. | F min |
|---|---|---|---|---|
| 1/8" | 11.2 | 10.8 | 9.5 | 16.0 |
| 1/4" | 14.6 | 14.2 | 9.5 | 16.0 |
| 3/8" | 18.0 | 17.6 | 9.5 | 17.5 |
| 1/2" | 22.2 | 21.8 | 9.5 | 22.5 |
| 3/4" | 27.6 | 27.2 | 12.5 | 24.0 |
| 1" | 34.3 | 33.9 | 12.5 | 28.5 |
| 1-1/4" | 43.1 | 42.7 | 12.5 | 30.0 |
| 1-1/2" | 49.2 | 48.8 | 12.5 | 32.0 |
| 2" | 61.7 | 61.2 | 16.0 | 41.0 |
| 2-1/2" | 74.4 | 73.9 | 16.0 | 43.0 |
| 3" | 90.3 | 89.8 | 16.0 | 44.5 |
| 4" | 115.7 | 115.2 | 19.0 | 48.0 |
| NPS | 3000# | 6000# | 9000# | |||
|---|---|---|---|---|---|---|
| C max. | C min. | C max. | C min. | C max. | C min. | |
| 1/8" | 3.18 | 3.18 | 3.96 | 3.43 | - | - |
| 1/4" | 3.78 | 3.30 | 4.60 | 4.01 | - | - |
| 3/8" | 4.01 | 3.50 | 5.03 | 4.37 | - | - |
| 1/2" | 4.67 | 4.09 | 5.97 | 5.18 | 9.35 | 8.18 |
| 3/4" | 4.90 | 4.27 | 6.96 | 6.04 | 9.78 | 8.56 |
| 1" | 5.69 | 4.98 | 7.92 | 6.93 | 11.38 | 9.96 |
| 1-1/4" | 6.07 | 5.28 | 7.92 | 6.93 | 12.14 | 10.62 |
| 1-1/2" | 6.35 | 5.54 | 8.92 | 7.80 | 12.70 | 11.12 |
| 2" | 6.93 | 6.04 | 10.92 | 9.50 | 13.84 | 12.12 |
| 2-1/2" | 8.76 | 7.67 | - | - | - | - |
| 3" | 9.52 | 8.30 | - | - | - | - |
| 4" | 10.69 | 9.53 | - | - | - | - |
| NPS | 3000# | 6000# | 9000# | |||
|---|---|---|---|---|---|---|
| D max. | D min. | D max. | D min. | D max. | D min. | |
| 1/8" | 7.6 | 6.1 | 4.8 | 3.2 | - | - |
| 1/4" | 10.0 | 8.5 | 7.1 | 5.6 | - | - |
| 3/8" | 13.3 | 11.8 | 9.9 | 8.4 | - | - |
| 1/2" | 16.6 | 15.0 | 12.5 | 11.0 | 7.2 | 5.6 |
| 3/4" | 21.7 | 20.2 | 16.3 | 14.8 | 11.8 | 10.3 |
| 1" | 27.4 | 25.9 | 21.5 | 19.9 | 16.0 | 14.4 |
| 1-1/4" | 35.8 | 34.3 | 30.2 | 28.7 | 23.5 | 22.2 |
| 1-1/2" | 41.6 | 40.1 | 34.7 | 33.2 | 28.7 | 27.2 |
| 2" | 53.3 | 51.7 | 43.6 | 42.1 | 38.9 | 37.4 |
| 2-1/2" | 64.2 | 61.2 | - | - | - | - |
| 3" | 79.4 | 76.4 | - | - | - | - |
| 4" | 103.8 | 100.7 | - | - | - | - |
Notes: B: Socket bore diameter; C: socket wall thickness; D: bore diameter of SW half coupling; J: socket depth; F: laying length of SW half coupling
| NPS | B | L 2 | D 3000# | D 6000# | W/2 |
|---|---|---|---|---|---|
| 1/8" | 6.4 | 6.7 | 16 | 22 | 16 |
| 1/4" | 8.1 | 10.2 | 19 | 25 | 17.5 |
| 3/8" | 9.1 | 10.4 | 22 | 32 | 24 |
| 1/2" | 10.9 | 13.6 | 28 | 38 | 24 |
| 3/4" | 12.7 | 13.9 | 35 | 44 | 25.5 |
| 1" | 14.7 | 17.3 | 44 | 57 | 30 |
| 1-1/4" | 17.0 | 18.0 | 57 | 64 | 33.5 |
| 1-1/2" | 17.8 | 18.4 | 64 | 76 | 39.5 |
| 2" | 19.0 | 19.2 | 76 | 92 | 43 |
| 2-1/2" | 23.6 | 28.9 | 92 | 108 | 46 |
| 3" | 25.9 | 30.5 | 108 | 127 | 54 |
| 4" | 27.7 | 33.0 | 140 | 159 | 60.5 |
Note: B: minimum length of perfect thread; L2: effective length of external thread; D: outside diameter; W/2: end to end length of threaded half coupling.
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