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ASME B16.11 Half Coupling | SW & Threaded
December 2, 2021
Technical Drawing & Function
The drawing of ASME B16.11 socket welding (SW) half coupling. 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.
The drawing of ASME B16.11 forged half coupling with threaded ends. 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.
The ASME B16.11 half coupling is a forged fitting primarily used for connecting small-bore screwed (THD) or socket-weld (SW) pipe to the large-bore main run pipe (header). SW half couplings are available in Class 3000, 6000 and 9000. It usually has larger overall length than SW full coupling counterpart. Threaded half couplings are available in Class 3000 and 6000. Its overall length is half of the threaded full coupling counterpart. Both construction and function of a half coupling are different from that of a full coupling. Only one end is furnished with either socket welding or internally threaded structure. There are two common methods used to make branch connections with half couplings: (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. The half coupling is inserted into the hole and is then welded.
| ASME B16.11 Forged Fittings (SW & THD) | ||
|---|---|---|
| 90° Elbow | 45° Elbow | Cross |
| Tee | Coupling | Half Coupling |
| Boss | Cap | Couplet |
| Street Elbow* | Plug* | Bushing* |
Dimensions & Masses of ASME B16.11 SW Half Couplings
| NPS | B max. | B min. | J min. |
|---|---|---|---|
| 1/8" | 11.2 | 10.8 | 9.5 |
| 1/4" | 14.6 | 14.2 | 9.5 |
| 3/8" | 18.0 | 17.6 | 9.5 |
| 1/2" | 22.2 | 21.8 | 9.5 |
| 3/4" | 27.6 | 27.2 | 12.5 |
| 1" | 34.3 | 33.9 | 12.5 |
| 1-1/4" | 43.1 | 42.7 | 12.5 |
| 1-1/2" | 49.2 | 48.8 | 12.5 |
| 2" | 61.7 | 61.2 | 16.0 |
| 2-1/2" | 74.4 | 73.9 | 16.0 |
| 3" | 90.3 | 89.8 | 16.0 |
| 4" | 115.7 | 115.2 | 19.0 |
| 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 | - | - | - | - |
| NPS | F mm | Mass 3000# kg | Mass 6000# kg |
|---|---|---|---|
| 1/8" | 16.0 | 0.06 | 0.11 |
| 1/4" | 16.0 | 0.07 | 0.14 |
| 3/8" | 17.5 | 0.10 | 0.23 |
| 1/2" | 22.5 | 0.16 | 0.35 |
| 3/4" | 24.0 | 0.23 | 0.45 |
| 1" | 28.5 | 0.38 | 0.80 |
| 1-1/4" | 30.0 | 0.63 | 1.08 |
| 1-1/2" | 32.0 | 0.80 | 1.52 |
| 2" | 41.0 | 1.24 | 2.55 |
| 2-1/2" | 43.0 | 1.90 | 3.61 |
| 3" | 44.5 | 2.45 | 5.00 |
| 4" | 48.0 | 4.16 | 8.50 |
Dimensions & Masses of ASME B16.11 Threaded Half Couplings
| NPS | B | L2 |
|---|---|---|
| 1/8" | 6.4 | 6.7 |
| 1/4" | 8.1 | 10.2 |
| 3/8" | 9.1 | 10.4 |
| 1/2" | 10.9 | 13.6 |
| 3/4" | 12.7 | 13.9 |
| 1" | 14.7 | 17.3 |
| 1-1/4" | 17.0 | 18.0 |
| 1-1/2" | 17.8 | 18.4 |
| 2" | 19.0 | 19.2 |
| 2-1/2" | 23.6 | 28.9 |
| 3" | 25.9 | 30.5 |
| 4" | 27.7 | 33.0 |
| NPS | D 3000# | D 6000# | W/2 |
|---|---|---|---|
| 1/8" | 16 | 22 | 16 |
| 1/4" | 19 | 25 | 17.5 |
| 3/8" | 22 | 32 | 24 |
| 1/2" | 28 | 38 | 24 |
| 3/4" | 35 | 44 | 25.5 |
| 1" | 44 | 57 | 30 |
| 1-1/4" | 57 | 64 | 33.5 |
| 1-1/2" | 64 | 76 | 39.5 |
| 2" | 76 | 92 | 43 |
| 2-1/2" | 92 | 108 | 46 |
| 3" | 108 | 127 | 54 |
| 4" | 140 | 159 | 60.5 |
| NPS | Mass 3000# kg | Mass 6000# kg |
|---|---|---|
| 1/8" | 0.03 | 0.05 |
| 1/4" | 0.04 | 0.06 |
| 3/8" | 0.05 | 0.07 |
| 1/2" | 0.08 | 0.15 |
| 3/4" | 0.11 | 0.23 |
| 1" | 0.22 | 0.48 |
| 1-1/4" | 0.42 | 0.65 |
| 1-1/2" | 0.54 | 1.00 |
| 2" | 0.82 | 1.70 |
| 2-1/2" | 1.16 | 2.50 |
| 3" | 1.80 | 3.35 |
| 4" | 3.20 | 6.25 |
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