Butt-weld fitting dimensions: ASME B16.9 charts with diagrams
Centre-to-end, length and height for elbows, tees, reducers, caps and stub ends, with every letter explained on a drawing.
Fitting dimension finder
Choose fitting and size; the drawing shows each value.
Fitting dimension finder
Choose a fitting and size. The letters on the drawing show exactly what each ASME B16.9 dimension measures.
Dimensions in mm per ASME B16.9 (short stub end per MSS SP-43).
What each letter means
ASME B16.9 dimension symbols used in all our tables.
- ACentre to end, 90° LR elbow
- ACentre to end, 90° SR elbow
- BCentre to end, 45° elbow
- CCentre to end of run
- MCentre to end of branch
- HOverall length, end to end
- ODLarge-end and small-end outside diameters
- GLap outside diameter
- FLength, short (MSS SP-43) or long (B16.9)
- EHeight, end to top
- ODOutside diameter at bevel
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Elbows: A and B
| Size | OD at bevel | 90° LR elbow A | 45° LR elbow B | 90° SR elbow A | |
|---|---|---|---|---|---|
| 1/2" (15 NB) | 21.3 | 38 | 16 | – | Quote |
| 3/4" (20 NB) | 26.7 | 29 | 11 | – | Quote |
| 1" (25 NB) | 33.4 | 38 | 22 | 25 | Quote |
| 1-1/4" (32 NB) | 42.2 | 48 | 25 | 32 | Quote |
| 1-1/2" (40 NB) | 48.3 | 57 | 29 | 38 | Quote |
| 2" (50 NB) | 60.3 | 76 | 35 | 51 | Quote |
| 2-1/2" (65 NB) | 73.0 | 95 | 44 | 64 | Quote |
| 3" (80 NB) | 88.9 | 114 | 51 | 76 | Quote |
| 3-1/2" (90 NB) | 101.6 | 133 | 57 | 89 | Quote |
| 4" (100 NB) | 114.3 | 152 | 64 | 102 | Quote |
| 5" (125 NB) | 141.3 | 190 | 79 | 127 | Quote |
| 6" (150 NB) | 168.3 | 229 | 95 | 152 | Quote |
| 8" (200 NB) | 219.1 | 305 | 127 | 203 | Quote |
| 10" (250 NB) | 273.0 | 381 | 159 | 254 | Quote |
| 12" (300 NB) | 323.8 | 457 | 190 | 305 | Quote |
| 14" (350 NB) | 355.6 | 533 | 222 | 356 | Quote |
| 16" (400 NB) | 406.4 | 610 | 254 | 406 | Quote |
| 18" (450 NB) | 457.2 | 686 | 286 | 457 | Quote |
| 20" (500 NB) | 508.0 | 762 | 318 | 508 | Quote |
| 24" (600 NB) | 609.6 | 914 | 381 | 610 | Quote |
| 30" (750 NB) | 762.0 | 1143 | 470 | 762 | Quote |
| 36" (900 NB) | 914.0 | 1372 | 565 | 914 | Quote |
Dimensions in mm per ASME B16.9 (stub-end short pattern per MSS SP-43).
Tees, reducers and caps: C, M, H and E
| Size | OD at bevel | Tee C and M | Reducer H | Cap E | |
|---|---|---|---|---|---|
| 1/2" (15 NB) | 21.3 | 25 | – | 25 | Quote |
| 3/4" (20 NB) | 26.7 | 29 | 38 | 25 | Quote |
| 1" (25 NB) | 33.4 | 38 | 51 | 38 | Quote |
| 1-1/4" (32 NB) | 42.2 | 48 | 51 | 38 | Quote |
| 1-1/2" (40 NB) | 48.3 | 57 | 64 | 38 | Quote |
| 2" (50 NB) | 60.3 | 64 | 76 | 38 | Quote |
| 2-1/2" (65 NB) | 73.0 | 76 | 89 | 38 | Quote |
| 3" (80 NB) | 88.9 | 86 | 89 | 51 | Quote |
| 3-1/2" (90 NB) | 101.6 | 95 | 102 | 64 | Quote |
| 4" (100 NB) | 114.3 | 105 | 102 | 64 | Quote |
| 5" (125 NB) | 141.3 | 124 | 127 | 76 | Quote |
| 6" (150 NB) | 168.3 | 143 | 140 | 89 | Quote |
| 8" (200 NB) | 219.1 | 178 | 152 | 102 | Quote |
| 10" (250 NB) | 273.0 | 216 | 178 | 127 | Quote |
| 12" (300 NB) | 323.8 | 254 | 203 | 152 | Quote |
| 14" (350 NB) | 355.6 | 279 | 330 | 165 | Quote |
| 16" (400 NB) | 406.4 | 305 | 356 | 178 | Quote |
| 18" (450 NB) | 457.2 | 343 | 381 | 203 | Quote |
| 20" (500 NB) | 508.0 | 381 | 508 | 229 | Quote |
| 24" (600 NB) | 609.6 | 432 | 508 | 267 | Quote |
| 30" (750 NB) | 762.0 | 559 | 610 | 267 | Quote |
| 36" (900 NB) | 914.0 | 673 | 610 | 267 | Quote |
Dimensions in mm per ASME B16.9 (stub-end short pattern per MSS SP-43).
Stub ends: G and F
| Size | OD at bevel | Stub end lap Ø G | Stub end F, short / long | |
|---|---|---|---|---|
| 1/2" (15 NB) | 21.3 | 35 | 51 / 76 | Quote |
| 3/4" (20 NB) | 26.7 | 43 | 51 / 76 | Quote |
| 1" (25 NB) | 33.4 | 51 | 51 / 102 | Quote |
| 1-1/4" (32 NB) | 42.2 | 64 | 51 / 102 | Quote |
| 1-1/2" (40 NB) | 48.3 | 73 | 51 / 102 | Quote |
| 2" (50 NB) | 60.3 | 92 | 64 / 152 | Quote |
| 2-1/2" (65 NB) | 73.0 | 105 | 64 / 152 | Quote |
| 3" (80 NB) | 88.9 | 127 | 64 / 152 | Quote |
| 3-1/2" (90 NB) | 101.6 | 140 | 76 / 152 | Quote |
| 4" (100 NB) | 114.3 | 157 | 76 / 152 | Quote |
| 5" (125 NB) | 141.3 | 186 | 76 / 203 | Quote |
| 6" (150 NB) | 168.3 | 216 | 89 / 203 | Quote |
| 8" (200 NB) | 219.1 | 270 | 102 / 203 | Quote |
| 10" (250 NB) | 273.0 | 324 | 127 / 254 | Quote |
| 12" (300 NB) | 323.8 | 381 | 152 / 254 | Quote |
| 14" (350 NB) | 355.6 | 413 | 152 / 305 | Quote |
| 16" (400 NB) | 406.4 | 470 | 152 / 305 | Quote |
| 18" (450 NB) | 457.2 | 533 | 152 / 305 | Quote |
| 20" (500 NB) | 508.0 | 584 | 152 / 305 | Quote |
| 24" (600 NB) | 609.6 | 692 | 152 / 305 | Quote |
Dimensions in mm per ASME B16.9 (stub-end short pattern per MSS SP-43).
Questions buyers ask
What is the centre-to-end dimension of an elbow?
It is the distance from the centre of curvature (where the two end centrelines cross) to the welding end, A for 90° elbows and B for 45° elbows.
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