ASME B16.9 Butt Weld Tee Dimensions
Centre-to-end dimensions of ASME B16.9 butt weld tees in millimetres. The first table covers straight (equal) tees from NPS ½" to 48"; the second covers reducing-outlet tees for run sizes up to NPS 24".
For a straight tee the run and outlet dimensions are equal up to NPS 24". For a reducing tee the run dimension C is that of the run size, and the outlet dimension M depends on the outlet size. Teshi Group manufactures equal and reducing tees as an OEM.
Key to dimensions
- OD
- Outside diameter at the bevel
- C
- Centre-to-end, run
- M
- Centre-to-end, outlet
ASME B16.9 Butt Weld Tee dimensions — tables
Straight (equal) tees (mm)
| NPSin | DN | ODat bevel | CRun | MOutlet |
|---|---|---|---|---|
| ½" | 15 | 21.3 | 25 | 25 |
| ¾" | 20 | 26.7 | 29 | 29 |
| 1" | 25 | 33.4 | 38 | 38 |
| 1¼" | 32 | 42.2 | 48 | 48 |
| 1½" | 40 | 48.3 | 57 | 57 |
| 2" | 50 | 60.3 | 64 | 64 |
| 2½" | 65 | 73.0 | 76 | 76 |
| 3" | 80 | 88.9 | 86 | 86 |
| 3½" | 90 | 101.6 | 95 | 95 |
| 4" | 100 | 114.3 | 105 | 105 |
| 5" | 125 | 141.3 | 124 | 124 |
| 6" | 150 | 168.3 | 143 | 143 |
| 8" | 200 | 219.1 | 178 | 178 |
| 10" | 250 | 273.0 | 216 | 216 |
| 12" | 300 | 323.8 | 254 | 254 |
| 14" | 350 | 355.6 | 279 | 279 |
| 16" | 400 | 406.4 | 305 | 305 |
| 18" | 450 | 457.0 | 343 | 343 |
| 20" | 500 | 508.0 | 381 | 381 |
| 22" | 550 | 559.0 | 419 | 419 |
| 24" | 600 | 610.0 | 432 | 432 |
| 26" | 650 | 660.0 | 495 | 495 |
| 28" | 700 | 711.0 | 521 | 521 |
| 30" | 750 | 762.0 | 559 | 559 |
| 32" | 800 | 813.0 | 597 | 597 |
| 34" | 850 | 864.0 | 635 | 635 |
| 36" | 900 | 914.0 | 673 | 673 |
| 38" | 950 | 965.0 | 711 | 711 |
| 40" | 1000 | 1016.0 | 749 | 749 |
| 42" | 1050 | 1067.0 | 762 | 711 |
| 44" | 1100 | 1118.0 | 813 | 762 |
| 46" | 1150 | 1168.0 | 851 | 800 |
| 48" | 1200 | 1219.0 | 889 | 838 |
Reducing outlet tees (mm)
| Run NPSin | Outlet NPSin | CRun | MOutlet |
|---|---|---|---|
| ½" | ⅜" | 25 | 25 |
| ½" | ¼" | 25 | 25 |
| ¾" | ½" | 29 | 29 |
| ¾" | ⅜" | 29 | 29 |
| 1" | ¾" | 38 | 38 |
| 1" | ½" | 38 | 38 |
| 1¼" | 1" | 48 | 48 |
| 1¼" | ¾" | 48 | 48 |
| 1¼" | ½" | 48 | 48 |
| 1½" | 1¼" | 57 | 57 |
| 1½" | 1" | 57 | 57 |
| 1½" | ¾" | 57 | 57 |
| 1½" | ½" | 57 | 57 |
| 2" | 1½" | 64 | 60 |
| 2" | 1¼" | 64 | 57 |
| 2" | 1" | 64 | 51 |
| 2" | ¾" | 64 | 44 |
| 2½" | 2" | 76 | 70 |
| 2½" | 1½" | 76 | 67 |
| 2½" | 1¼" | 76 | 64 |
| 2½" | 1" | 76 | 57 |
| 3" | 2½" | 86 | 83 |
| 3" | 2" | 86 | 76 |
| 3" | 1½" | 86 | 73 |
| 3" | 1¼" | 86 | 70 |
| 3½" | 3" | 95 | 92 |
| 3½" | 2½" | 95 | 89 |
| 3½" | 2" | 95 | 83 |
| 3½" | 1½" | 95 | 79 |
| 4" | 3½" | 105 | 102 |
| 4" | 3" | 105 | 98 |
| 4" | 2½" | 105 | 95 |
| 4" | 2" | 105 | 89 |
| 4" | 1½" | 105 | 86 |
| 5" | 4" | 124 | 117 |
| 5" | 3½" | 124 | 114 |
| 5" | 3" | 124 | 111 |
| 5" | 2½" | 124 | 108 |
| 5" | 2" | 124 | 105 |
| 6" | 5" | 143 | 137 |
| 6" | 4" | 143 | 130 |
| 6" | 3½" | 143 | 127 |
| 6" | 3" | 143 | 124 |
| 6" | 2½" | 143 | 121 |
| 8" | 6" | 178 | 168 |
| 8" | 5" | 178 | 162 |
| 8" | 4" | 178 | 156 |
| 8" | 3½" | 178 | 152 |
| 10" | 8" | 216 | 203 |
| 10" | 6" | 216 | 194 |
| 10" | 5" | 216 | 191 |
| 10" | 4" | 216 | 184 |
| 12" | 10" | 254 | 241 |
| 12" | 8" | 254 | 229 |
| 12" | 6" | 254 | 219 |
| 12" | 5" | 254 | 216 |
| 14" | 12" | 279 | 270 |
| 14" | 10" | 279 | 257 |
| 14" | 8" | 279 | 248 |
| 14" | 6" | 279 | 238 |
| 16" | 14" | 305 | 305 |
| 16" | 12" | 305 | 295 |
| 16" | 10" | 305 | 283 |
| 16" | 8" | 305 | 273 |
| 16" | 6" | 305 | 264 |
| 18" | 16" | 343 | 330 |
| 18" | 14" | 343 | 330 |
| 18" | 12" | 343 | 321 |
| 18" | 10" | 343 | 308 |
| 18" | 8" | 343 | 298 |
| 20" | 18" | 381 | 368 |
| 20" | 16" | 381 | 356 |
| 20" | 14" | 381 | 356 |
| 20" | 12" | 381 | 346 |
| 20" | 10" | 381 | 333 |
| 20" | 8" | 381 | 324 |
| 22" | 20" | 419 | 406 |
| 22" | 18" | 419 | 394 |
| 22" | 16" | 419 | 381 |
| 22" | 14" | 419 | 381 |
| 22" | 12" | 419 | 371 |
| 22" | 10" | 419 | 359 |
| 24" | 22" | 432 | 432 |
| 24" | 20" | 432 | 432 |
| 24" | 18" | 432 | 419 |
| 24" | 16" | 432 | 406 |
| 24" | 14" | 432 | 406 |
| 24" | 12" | 432 | 397 |
| 24" | 10" | 432 | 384 |
Notes
- Dimensions are in millimetres unless stated otherwise.
- For straight tees above NPS 24" the outlet dimension M is as tabulated and may be less than C.
Reference information compiled from the published standard for convenience. It does not replace the current edition of the governing standard, which takes precedence. Verify critical dimensions and properties before design, purchase or fabrication. Teshi Engineers & Sales Promoters (P) Ltd accepts no liability for errors or omissions.
Equivalent and related standards to ASME B16.9 Butt Weld Tee Dimensions
All equivalents| Region | Standard | Relationship |
|---|---|---|
| Europe | EN 10253-2 / EN 10253-4 | Butt-welding fittings, carbon/alloy and stainless — Type B to ASME B16.9 dimensions |
| China | GB/T 12459 | Seamless butt-welding fittings — dimensions aligned with ASME B16.9 |
| China | GB/T 13401 | Welded butt-welding fittings from plate |
| China | SH/T 3408 | Petrochemical butt-welding fittings |
| Japan | JIS B2311 / B2312 / B2313 | Butt-welding fittings for ordinary use, for pressure use, and from plate |
| USA | MSS SP-75 | High-yield butt-welding fittings for pipelines |
| USA | ASME B16.28 (withdrawn) | Short-radius elbows, now in B16.9 |
Teshi Group manufactures flanges and fittings to all of these standards on request, including Chinese GB / HG / SH and European EN dimensions for export projects. Always confirm bolting, facing and thickness when substituting one standard for another.
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ASME B16.9 Butt Weld Tee Dimensions — size by size
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FAQ
ASME B16.9 tee dimensions: common questions
What is the centre-to-end dimension of a 4 inch equal tee?
105 mm for both the run (C) and the outlet (M).
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