ASME B16.5 — Class 600 flange (mm)
ASME B16.5 Class 600 flange (mm) — 20 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 | 95 | 14.3 | 34.9 | 38 | 21.3 | 52 | 22 | 22 | 66.7 | 4 | 15.9 | ½" |
| ¾" | 20 | 115 | 15.9 | 42.9 | 48 | 26.7 | 57 | 25 | 25 | 82.6 | 4 | 19.1 | ⅝" |
| 1" | 25 | 125 | 17.5 | 50.8 | 54 | 33.4 | 62 | 27 | 27 | 88.9 | 4 | 19.1 | ⅝" |
| 1¼" | 32 | 135 | 20.7 | 63.5 | 64 | 42.2 | 67 | 29 | 29 | 98.4 | 4 | 19.1 | ⅝" |
| 1½" | 40 | 155 | 22.3 | 73 | 70 | 48.3 | 70 | 32 | 32 | 114.3 | 4 | 22.2 | ¾" |
| 2" | 50 | 165 | 25.4 | 92.1 | 84 | 60.3 | 73 | 37 | 37 | 127 | 8 | 19.1 | ⅝" |
| 2½" | 65 | 190 | 28.6 | 104.8 | 100 | 73 | 79 | 41 | 41 | 149.2 | 8 | 22.2 | ¾" |
| 3" | 80 | 210 | 31.8 | 127 | 117 | 88.9 | 83 | 46 | 46 | 168.3 | 8 | 22.2 | ¾" |
| 3½" | 90 | 230 | 35 | 139.7 | 133 | 101.6 | 86 | 49 | 49 | 184.2 | 8 | 25.4 | ⅞" |
| 4" | 100 | 275 | 38.1 | 157.2 | 152 | 114.3 | 102 | 54 | 54 | 215.9 | 8 | 25.4 | ⅞" |
| 5" | 125 | 330 | 44.5 | 185.7 | 189 | 141.3 | 114 | 60 | 60 | 266.7 | 8 | 28.6 | 1" |
| 6" | 150 | 355 | 47.7 | 215.9 | 222 | 168.3 | 117 | 67 | 67 | 292.1 | 12 | 28.6 | 1" |
| 8" | 200 | 420 | 55.6 | 269.9 | 273 | 219.1 | 133 | 76 | 76 | 349.2 | 12 | 31.8 | 1⅛" |
| 10" | 250 | 510 | 63.5 | 323.8 | 343 | 273 | 152 | 86 | 111 | 431.8 | 16 | 34.9 | 1¼" |
| 12" | 300 | 560 | 66.7 | 381 | 400 | 323.8 | 156 | 92 | 117 | 489 | 20 | 34.9 | 1¼" |
| 14" | 350 | 605 | 69.9 | 412.8 | 432 | 355.6 | 165 | 94 | 127 | 527 | 20 | 38.1 | 1⅜" |
| 16" | 400 | 685 | 76.2 | 469.9 | 495 | 406.4 | 178 | 106 | 140 | 603.2 | 20 | 41.3 | 1½" |
| 18" | 450 | 745 | 82.6 | 533.4 | 546 | 457 | 184 | 117 | 152 | 654 | 20 | 44.5 | 1⅝" |
| 20" | 500 | 815 | 88.9 | 584.2 | 610 | 508 | 190 | 127 | 165 | 723.9 | 24 | 44.5 | 1⅝" |
| 24" | 600 | 940 | 101.6 | 692.2 | 718 | 610 | 203 | 140 | 184 | 838.2 | 24 | 50.8 | 1⅞" |
- 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.
- 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.