Complete dimensional reference for all standard buttweld fitting types per ASME B16.9. Elbows, tees, reducers, and caps — all in one place.
ASME B16.9 specifies the dimensional standards for all factory-made wrought buttweld fittings. Key dimensions are: Centre-to-Face (C), Centre-to-End (M/C for tees), End-to-End (H for reducers and caps), and Outside Diameter (OD). All fittings must match these dimensions to ensure interchangeability across manufacturers.
| NPS | OD (mm) | LR C-Face (mm) | SR C-Face (mm) | 45° C-Face (mm) |
|---|---|---|---|---|
| ½" | 21.3 | 38 | 25 | 16 |
| ¾" | 26.7 | 38 | 25 | 19 |
| 1" | 33.4 | 38 | 25 | 22 |
| 1½" | 48.3 | 57 | 38 | 29 |
| 2" | 60.3 | 76 | 51 | 35 |
| 2½" | 73.0 | 95 | 64 | 44 |
| 3" | 88.9 | 114 | 76 | 51 |
| 4" | 114.3 | 152 | 102 | 64 |
| 5" | 141.3 | 190 | 127 | 79 |
| 6" | 168.3 | 228 | 152 | 95 |
| 8" | 219.1 | 305 | 203 | 124 |
| 10" | 273.1 | 381 | 254 | 152 |
| 12" | 323.9 | 457 | 305 | 178 |
| 14" | 355.6 | 533 | 356 | 203 |
| 16" | 406.4 | 610 | 406 | 229 |
| 18" | 457.2 | 686 | 457 | 254 |
| 20" | 508.0 | 762 | 508 | 279 |
| 24" | 609.6 | 914 | 610 | 330 |
| NPS | OD (mm) | Run M (mm) | Branch C (mm) |
|---|---|---|---|
| ½" | 21.3 | 25 | 25 |
| 1" | 33.4 | 38 | 38 |
| 2" | 60.3 | 57 | 57 |
| 3" | 88.9 | 76 | 76 |
| 4" | 114.3 | 95 | 95 |
| 6" | 168.3 | 143 | 143 |
| 8" | 219.1 | 178 | 178 |
| 10" | 273.1 | 216 | 216 |
| 12" | 323.9 | 254 | 254 |
| 16" | 406.4 | 330 | 330 |
| 20" | 508.0 | 406 | 406 |
| 24" | 609.6 | 508 | 508 |
| Large End NPS | Small End NPS | Length H (mm) |
|---|---|---|
| 1" | ¾" | 38 |
| 2" | 1½" | 64 |
| 3" | 2" | 76 |
| 4" | 3" | 102 |
| 6" | 4" | 152 |
| 8" | 6" | 203 |
| 10" | 8" | 254 |
| 12" | 10" | 305 |
| 16" | 12" | 356 |
| 20" | 16" | 508 |
| 24" | 20" | 610 |
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