Reducing tees and crosses are used for branch connection of smaller size than that of a header. ASME B16.9 Table 8 provides dimensions for size range ½” by ¼” to 48 by 30”. As straight crosses, reducing crosses are also used sparingly to reduce size of inventory. In place of a cross, two reducing tees are normally used. Such crosses are used only when there is a space constraint such as in marine applications or revamp work. This page provides metric dimensions for Reducing Tees and Crosses.
Available Dimensions are : OD1 | Outside Diameter at Bevel for Run Pipe, OD2 | Outside Diameter at Bevel for Branch Pipe, C | Center to End Dimension for Run Pipe, M | Center to End Dimension for Branch Pipe.
| NPS1 | NPS2 | OD1 | OD2 | C | M |
|---|---|---|---|---|---|
| 1/2 | 3/8 | 21.3 | 17.3 | 25 | 25 |
| 1/2 | 1/4 | 21.3 | 13.7 | 25 | 25 |
| 3/4 | 1/2 | 26.7 | 21.3 | 29 | 29 |
| 3/4 | 3/8 | 26.7 | 17.3 | 29 | 29 |
| 1 | 3/4 | 33.4 | 26.7 | 38 | 38 |
| 1 | 1/2 | 33.4 | 21.3 | 38 | 38 |
| 1-1/4 | 1 | 42.2 | 33.4 | 48 | 48 |
| 1-1/4 | 3/4 | 42.2 | 26.7 | 48 | 48 |
| 1-1/4 | 1/2 | 42.2 | 21.3 | 48 | 48 |
| 1-1/2 | 1-1/4 | 48.3 | 42.2 | 57 | 57 |
| 1-1/2 | 1 | 48.3 | 33.4 | 57 | 57 |
| 1-1/2 | 3/4 | 48.3 | 26.7 | 57 | 57 |
| 1-1/2 | 1/2 | 48.3 | 21.3 | 57 | 57 |
| 2 | 1-1/2 | 60.3 | 48.3 | 64 | 60 |
| 2 | 1-1/4 | 60.3 | 42.2 | 64 | 57 |
| NPS1 | NPS2 | OD1 | OD2 | C | M |
| 2 | 1 | 60.3 | 33.4 | 64 | 51 |
| 2 | 3/4 | 60.3 | 26.7 | 64 | 44 |
| 2-1/2 | 2 | 73.0 | 60.3 | 76 | 70 |
| 2-1/2 | 1-1/2 | 73.0 | 48.3 | 76 | 67 |
| 2-1/2 | 1-1/4 | 73.0 | 42.2 | 76 | 64 |
| 2-1/2 | 1 | 73.0 | 33.4 | 76 | 57 |
| 3 | 2-1/2 | 88.9 | 73.0 | 86 | 83 |
| 3 | 2 | 88.9 | 60.3 | 86 | 76 |
| 3 | 1-1/2 | 88.9 | 48.3 | 86 | 73 |
| 3 | 1-1/4 | 88.9 | 42.2 | 86 | 70 |
| 3-1/2 | 3 | 101.6 | 88.9 | 95 | 92 |
| 3-1/2 | 2-1/2 | 101.6 | 73.0 | 95 | 89 |
| 3-1/2 | 2 | 101.6 | 60.3 | 95 | 83 |
| 3-1/2 | 1-1/2 | 101.6 | 48.3 | 95 | 79 |
| 4 | 3-1/2 | 114.3 | 101.6 | 105 | 102 |
| NPS1 | NPS2 | OD1 | OD2 | C | M |
| 4 | 3 | 114.3 | 88.9 | 105 | 98 |
| 4 | 2-1/2 | 114.3 | 73.0 | 105 | 95 |
| 4 | 2 | 114.3 | 60.3 | 105 | 89 |
| 4 | 1-1/2 | 114.3 | 48.3 | 105 | 86 |
| 5 | 4 | 141.3 | 114.3 | 124 | 117 |
| 5 | 3-1/2 | 141.3 | 101.6 | 124 | 114 |
| 5 | 3 | 141.3 | 88.9 | 124 | 111 |
| 5 | 2-1/2 | 141.3 | 73.0 | 124 | 108 |
| 5 | 2 | 141.3 | 60.3 | 124 | 105 |
| 6 | 5 | 168.3 | 141.3 | 143 | 137 |
| 6 | 4 | 168.3 | 114.3 | 143 | 130 |
| 6 | 3-1/2 | 168.3 | 101.6 | 143 | 127 |
| 6 | 3 | 168.3 | 88.9 | 143 | 124 |
| 6 | 2-1/2 | 168.3 | 73.0 | 143 | 121 |
| 8 | 6 | 219.1 | 168.3 | 178 | 168 |
| NPS1 | NPS2 | OD1 | OD2 | C | M |
| 8 | 5 | 219.1 | 141.3 | 178 | 162 |
| 8 | 4 | 219.1 | 114.3 | 178 | 156 |
| 8 | 3-1/2 | 219.1 | 101.6 | 178 | 152 |
| 10 | 8 | 273.0 | 219.1 | 216 | 203 |
| 10 | 6 | 273.0 | 168.3 | 216 | 194 |
| 10 | 5 | 273.0 | 141.3 | 216 | 191 |
| 10 | 4 | 273.0 | 114.3 | 216 | 184 |
| 12 | 10 | 323.8 | 273.0 | 254 | 241 |
| 12 | 8 | 323.8 | 219.1 | 254 | 229 |
| 12 | 6 | 323.8 | 168.3 | 254 | 219 |
| 12 | 5 | 323.8 | 141.3 | 254 | 216 |
| 14 | 12 | 355.6 | 323.8 | 279 | 270 |
| 14 | 10 | 355.6 | 273.0 | 279 | 257 |
| 14 | 8 | 355.6 | 219.1 | 279 | 248 |
| 14 | 6 | 355.6 | 168.3 | 279 | 238 |
| NPS1 | NPS2 | OD1 | OD2 | C | M |
| 16 | 14 | 406.4 | 355.6 | 305 | 305 |
| 16 | 12 | 406.4 | 323.8 | 305 | 295 |
| 16 | 10 | 406.4 | 273.0 | 305 | 283 |
| 16 | 8 | 406.4 | 219.1 | 305 | 273 |
| 16 | 6 | 406.4 | 168.3 | 305 | 264 |
| 18 | 16 | 457.0 | 406.4 | 343 | 330 |
| 18 | 14 | 457.0 | 355.6 | 343 | 330 |
| 18 | 12 | 457.0 | 323.8 | 343 | 321 |
| 18 | 10 | 457.0 | 273.0 | 343 | 308 |
| 18 | 8 | 457.0 | 219.1 | 343 | 298 |
| 20 | 18 | 508.0 | 457.0 | 381 | 368 |
| 20 | 16 | 508.0 | 406.4 | 381 | 356 |
| 20 | 14 | 508.0 | 355.6 | 381 | 356 |
| 20 | 12 | 508.0 | 323.8 | 381 | 346 |
| 20 | 10 | 508.0 | 273.0 | 381 | 333 |
| NPS1 | NPS2 | OD1 | OD2 | C | M |
| 20 | 8 | 508.0 | 219.1 | 381 | 324 |
| 22 | 20 | 559.0 | 508.0 | 419 | 406 |
| 22 | 18 | 559.0 | 457.0 | 419 | 394 |
| 22 | 16 | 559.0 | 406.4 | 419 | 381 |
| 22 | 14 | 559.0 | 355.6 | 419 | 381 |
| 22 | 12 | 559.0 | 323.8 | 419 | 371 |
| 22 | 10 | 559.0 | 273.0 | 419 | 359 |
| 24 | 22 | 610.0 | 559.0 | 432 | 432 |
| 24 | 20 | 610.0 | 508.0 | 432 | 432 |
| 24 | 18 | 610.0 | 457.0 | 432 | 419 |
| 24 | 16 | 610.0 | 406.4 | 432 | 406 |
| 24 | 14 | 610.0 | 355.6 | 432 | 406 |
| 24 | 12 | 610.0 | 323.8 | 432 | 397 |
| 24 | 10 | 610.0 | 273.0 | 432 | 384 |
| 26 | 24 | 660.0 | 610.0 | 495 | 483 |
| NPS1 | NPS2 | OD1 | OD2 | C | M |
| 26 | 22 | 660.0 | 559.0 | 495 | 470 |
| 26 | 20 | 660.0 | 508.0 | 495 | 457 |
| 26 | 18 | 660.0 | 457.0 | 495 | 444 |
| 26 | 16 | 660.0 | 406.4 | 495 | 432 |
| 26 | 14 | 660.0 | 355.6 | 495 | 432 |
| 26 | 12 | 660.0 | 323.8 | 495 | 422 |
| 28 | 26 | 711.0 | 660.0 | 521 | 521 |
| 28 | 24 | 711.0 | 610.0 | 521 | 508 |
| 28 | 22 | 711.0 | 559.0 | 521 | 495 |
| 28 | 20 | 711.0 | 508.0 | 521 | 483 |
| 28 | 18 | 711.0 | 457.0 | 521 | 470 |
| 28 | 16 | 711.0 | 406.4 | 521 | 457 |
| 28 | 14 | 711.0 | 355.6 | 521 | 457 |
| 28 | 12 | 711.0 | 323.8 | 521 | 448 |
| 30 | 28 | 762.0 | 711.0 | 559 | 546 |
| NPS1 | NPS2 | OD1 | OD2 | C | M |
| 30 | 26 | 762.0 | 660.0 | 559 | 546 |
| 30 | 24 | 762.0 | 610.0 | 559 | 533 |
| 30 | 22 | 762.0 | 559.0 | 559 | 521 |
| 30 | 20 | 762.0 | 508.0 | 559 | 508 |
| 30 | 18 | 762.0 | 457.0 | 559 | 495 |
| 30 | 16 | 762.0 | 406.4 | 559 | 483 |
| 30 | 14 | 762.0 | 355.6 | 559 | 483 |
| 30 | 12 | 762.0 | 323.8 | 559 | 473 |
| 30 | 10 | 762.0 | 273.0 | 559 | 460 |
| 32 | 30 | 813.0 | 762.0 | 597 | 584 |
| 32 | 28 | 813.0 | 711.0 | 597 | 572 |
| 32 | 26 | 813.0 | 660.0 | 597 | 572 |
| 32 | 24 | 813.0 | 610.0 | 597 | 559 |
| 32 | 22 | 813.0 | 559.0 | 597 | 546 |
| 32 | 20 | 813.0 | 508.0 | 597 | 533 |
| NPS1 | NPS2 | OD1 | OD2 | C | M |
| 32 | 18 | 813.0 | 457.0 | 597 | 521 |
| 32 | 16 | 813.0 | 406.4 | 597 | 508 |
| 32 | 14 | 813.0 | 355.6 | 597 | 508 |
| 34 | 32 | 864.0 | 813.0 | 635 | 622 |
| 34 | 30 | 864.0 | 762.0 | 635 | 610 |
| 34 | 28 | 864.0 | 711.0 | 635 | 597 |
| 34 | 26 | 864.0 | 660.0 | 635 | 597 |
| 34 | 24 | 864.0 | 610.0 | 635 | 584 |
| 34 | 22 | 864.0 | 559.0 | 635 | 572 |
| 34 | 20 | 864.0 | 508.0 | 635 | 559 |
| 34 | 18 | 864.0 | 457.0 | 635 | 546 |
| 34 | 16 | 864.0 | 406.4 | 635 | 533 |
| 36 | 34 | 914.0 | 864.0 | 673 | 660 |
| 36 | 32 | 914.0 | 813.0 | 673 | 648 |
| 36 | 30 | 914.0 | 762.0 | 673 | 635 |
| NPS1 | NPS2 | OD1 | OD2 | C | M |
| 36 | 28 | 914.0 | 711.0 | 673 | 622 |
| 36 | 26 | 914.0 | 660.0 | 673 | 622 |
| 36 | 24 | 914.0 | 610.0 | 673 | 610 |
| 36 | 22 | 914.0 | 559.0 | 673 | 597 |
| 36 | 20 | 914.0 | 508.0 | 673 | 584 |
| 36 | 18 | 914.0 | 457.0 | 673 | 572 |
| 36 | 16 | 914.0 | 406.4 | 673 | 559 |
| 38 | 36 | 965.0 | 914.0 | 711 | 711 |
| 38 | 34 | 965.0 | 864.0 | 711 | 698 |
| 38 | 32 | 965.0 | 813.0 | 711 | 686 |
| 38 | 30 | 965.0 | 762.0 | 711 | 673 |
| 38 | 28 | 965.0 | 711.0 | 711 | 648 |
| 38 | 26 | 965.0 | 660.0 | 711 | 648 |
| 38 | 24 | 965.0 | 610.0 | 711 | 635 |
| 38 | 22 | 965.0 | 559.0 | 711 | 622 |
| NPS1 | NPS2 | OD1 | OD2 | C | M |
| 38 | 20 | 965.0 | 508.0 | 711 | 610 |
| 38 | 18 | 965.0 | 457.0 | 711 | 597 |
| 40 | 38 | 1016.0 | 965.0 | 749 | 749 |
| 40 | 36 | 1016.0 | 914.0 | 749 | 737 |
| 40 | 34 | 1016.0 | 864.0 | 749 | 724 |
| 40 | 32 | 1016.0 | 813.0 | 749 | 711 |
| 40 | 30 | 1016.0 | 762.0 | 749 | 698 |
| 40 | 28 | 1016.0 | 711.0 | 749 | 673 |
| 40 | 26 | 1016.0 | 660.0 | 749 | 673 |
| 40 | 24 | 1016.0 | 610.0 | 749 | 660 |
| 40 | 22 | 1016.0 | 559.0 | 749 | 648 |
| 40 | 20 | 1016.0 | 508.0 | 749 | 635 |
| 40 | 18 | 1016.0 | 457.0 | 749 | 622 |
| 42 | 40 | 1067.0 | 1016.0 | 762 | 711 |
| 42 | 38 | 1067.0 | 968.0 | 762 | 711 |
| NPS1 | NPS2 | OD1 | OD2 | C | M |
| 42 | 36 | 1067.0 | 914.0 | 762 | 711 |
| 42 | 34 | 1067.0 | 864.0 | 762 | 711 |
| 42 | 32 | 1067.0 | 813.0 | 762 | 711 |
| 42 | 30 | 1067.0 | 762.0 | 762 | 711 |
| 42 | 28 | 1067.0 | 711.0 | 762 | 698 |
| 42 | 26 | 1067.0 | 660.0 | 762 | 698 |
| 42 | 24 | 1067.0 | 610.0 | 762 | 660 |
| 42 | 22 | 1067.0 | 559.0 | 762 | 660 |
| 42 | 20 | 1067.0 | 508.0 | 762 | 660 |
| 42 | 18 | 1067.0 | 457.0 | 762 | 648 |
| 42 | 16 | 1067.0 | 406.4 | 762 | 635 |
| 44 | 42 | 1118.0 | 1067.0 | 813 | 762 |
| 44 | 40 | 1118.0 | 1016.0 | 813 | 749 |
| 44 | 38 | 1118.0 | 965.0 | 813 | 737 |
| 44 | 36 | 1118.0 | 914.0 | 813 | 724 |
| NPS1 | NPS2 | OD1 | OD2 | C | M |
| 44 | 34 | 1118.0 | 864.0 | 813 | 724 |
| 44 | 32 | 1118.0 | 813.0 | 813 | 711 |
| 44 | 30 | 1118.0 | 762.0 | 813 | 711 |
| 44 | 28 | 1118.0 | 711.0 | 813 | 698 |
| 44 | 26 | 1118.0 | 660.0 | 813 | 698 |
| 44 | 24 | 1118.0 | 610.0 | 813 | 698 |
| 44 | 22 | 1118.0 | 559.0 | 813 | 686 |
| 44 | 20 | 1118.0 | 508.0 | 813 | 686 |
| 46 | 44 | 1168.0 | 1118.0 | 851 | 800 |
| 46 | 42 | 1168.0 | 1067.0 | 851 | 787 |
| 46 | 40 | 1168.0 | 1016.0 | 851 | 775 |
| 46 | 38 | 1168.0 | 965.0 | 851 | 762 |
| 46 | 36 | 1168.0 | 914.0 | 851 | 762 |
| 46 | 34 | 1168.0 | 864.0 | 851 | 749 |
| 46 | 32 | 1168.0 | 813.0 | 851 | 749 |
| NPS1 | NPS2 | OD1 | OD2 | C | M |
| 46 | 30 | 1168.0 | 762.0 | 851 | 737 |
| 46 | 28 | 1168.0 | 711.0 | 851 | 737 |
| 46 | 26 | 1168.0 | 660.0 | 851 | 737 |
| 46 | 24 | 1168.0 | 610.0 | 851 | 724 |
| 46 | 22 | 1168.0 | 559.0 | 851 | 724 |
| 48 | 46 | 1219.0 | 1168.0 | 889 | 838 |
| 48 | 44 | 1219.0 | 1118.0 | 889 | 838 |
| 48 | 42 | 1219.0 | 1067.0 | 889 | 813 |
| 48 | 40 | 1219.0 | 1016.0 | 889 | 813 |
| 48 | 38 | 1219.0 | 965.0 | 889 | 813 |
| 48 | 36 | 1219.0 | 914.0 | 889 | 787 |
| 48 | 34 | 1219.0 | 864.0 | 889 | 787 |
| 48 | 32 | 1219.0 | 813.0 | 889 | 787 |
| 48 | 30 | 1219.0 | 762.0 | 889 | 762 |
| 48 | 28 | 1219.0 | 711.0 | 889 | 762 |
| NPS1 | NPS2 | OD1 | OD2 | C | M |
| 48 | 26 | 1219.0 | 660.0 | 889 | 762 |
| 48 | 24 | 1219.0 | 610.0 | 889 | 737 |
| 48 | 22 | 1219.0 | 559.0 | 889 | 737 |
GENERAL NOTE:
All dimensions are in millimeters.
NOTE:
(1) Outlet dimension M for run sizes NPS 14 and larger is recommended but not required.
