ASME B16.5 — Class 1500 flange (mm)
ASME B16.5 Class 1500 flange (mm) — 19 sizes.
| NPS | DN | O — Outside dia (mm) | tf — Min thickness (mm) | R — Raised face dia (mm) | X — Hub dia (mm) | A — Hub at weld (mm) | Y — Weld neck (mm) | Y — Slip-on / Thr / SW (mm) | Y — Lap joint (mm) | W — Bolt circle (mm) | Holes — No. | Hole dia — mm (mm) | Bolt — in (in) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ½" | 15 | 120 | 22.3 | 34.9 | 38 | 21.3 | 60 | 32 | 32 | 82.6 | 4 | 22.2 | ¾" |
| ¾" | 20 | 130 | 25.4 | 42.9 | 44 | 26.7 | 70 | 35 | 35 | 88.9 | 4 | 22.2 | ¾" |
| 1" | 25 | 150 | 28.6 | 50.8 | 52 | 33.4 | 73 | 41 | 41 | 101.6 | 4 | 25.4 | ⅞" |
| 1¼" | 32 | 160 | 28.6 | 63.5 | 64 | 42.2 | 73 | 41 | 41 | 111.1 | 4 | 25.4 | ⅞" |
| 1½" | 40 | 180 | 31.8 | 73 | 70 | 48.3 | 83 | 44 | 44 | 123.8 | 4 | 28.6 | 1" |
| 2" | 50 | 215 | 38.1 | 92.1 | 105 | 60.3 | 102 | 57 | 57 | 165.1 | 8 | 25.4 | ⅞" |
| 2½" | 65 | 245 | 41.3 | 104.8 | 124 | 73 | 105 | 64 | 64 | 190.5 | 8 | 28.6 | 1" |
| 3" | 80 | 265 | 47.7 | 127 | 133 | 88.9 | 117 | 73 | 73 | 203.2 | 8 | 31.8 | 1⅛" |
| 4" | 100 | 310 | 54 | 157.2 | 162 | 114.3 | 124 | 90 | 90 | 241.3 | 8 | 34.9 | 1¼" |
| 5" | 125 | 375 | 73.1 | 185.7 | 197 | 141.3 | 155 | 105 | 105 | 292.1 | 8 | 41.3 | 1½" |
| 6" | 150 | 395 | 82.6 | 215.9 | 229 | 168.3 | 171 | 119 | 119 | 317.5 | 12 | 38.1 | 1⅜" |
| 8" | 200 | 485 | 92.1 | 269.9 | 292 | 219.1 | 213 | 143 | 143 | 393.7 | 12 | 44.5 | 1⅝" |
| 10" | 250 | 585 | 108 | 323.8 | 368 | 273 | 254 | 159 | 178 | 482.6 | 12 | 50.8 | 1⅞" |
| 12" | 300 | 675 | 123.9 | 381 | 451 | 323.8 | 283 | 181 | 219 | 571.5 | 16 | 54 | 2" |
| 14" | 350 | 750 | 133.4 | 412.8 | 495 | 355.6 | 298 | — | 241 | 635 | 16 | 60.3 | 2¼" |
| 16" | 400 | 825 | 146.1 | 469.9 | 552 | 406.4 | 311 | — | 260 | 704.8 | 16 | 66.7 | 2½" |
| 18" | 450 | 915 | 162 | 533.4 | 597 | 457 | 327 | — | 276 | 774.7 | 16 | 73 | 2¾" |
| 20" | 500 | 985 | 177.8 | 584.2 | 641 | 508 | 356 | — | 292 | 831.8 | 16 | 79.4 | 3" |
| 24" | 600 | 1170 | 203.2 | 692.2 | 762 | 610 | 406 | — | 330 | 990.6 | 16 | 92.1 | 3½" |
- Dimensions are in millimetres unless stated otherwise.
- Flange thickness tf and length through hub Y do not include the 7 mm raised face.
- Blind flanges have the same outside diameter, thickness tf and drilling as the other flange types of the same size and class.
- Slip-on and socket weld flanges are not listed in Class 1500 above NPS 2½"; the slip-on column then applies to threaded flanges only.
- The bore of a weld neck or socket weld flange is machined to match the inside diameter of the pipe schedule stated in the order.
- Bolt holes are tabulated in inches in ASME B16.5; the millimetre values shown are direct conversions (bolt diameter plus ⅛").
- Stud bolt lengths do not include the height of the points. Weights are approximate catalogue values and vary with bore and manufacturer.