| NPS |
Maximum Bore (B) |
Outside Diameter of Flange (OD) |
Maximum Chamfer (C) |
Diameter of Raised Face (K) |
Total Thickness of Flange (T) [+0.12 / -0.12] |
Basic Thickness of Flange (Q) |
Diameter of Hub (X) |
Diameter of Bolt Circle (BC) |
Number of Bolts (N) |
Bolt Size & TPI |
Bolt Holes (BH) Diameter |
Bolt Holes (BH) Tolerance |
Ring Groove Number |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2-1/16 | 2.09 | 6.50 ± 0.06 | 0.12 | 4.25 | 1.31 | 1.00 | 3.31 | 5.00 | 8 | 5/8-11 | 0.75 | +0.06/-0.02 | R23 |
| 2-9/16 | 2.59 | 7.50 ± 0.06 | 0.12 | 5.00 | 1.44 | 1.12 | 3.94 | 5.88 | 8 | 3/4-10 | 0.88 | +0.06/-0.02 | R26 |
| 3-1/8 | 3.22 | 8.25 ± 0.06 | 0.12 | 5.75 | 1.56 | 1.25 | 4.62 | 6.62 | 8 | 3/4-10 | 0.88 | +0.06/-0.02 | R31 |
| 4-1/16 | 4.28 | 10.75 ± 0.06 | 0.12 | 6.88 | 1.81 | 1.50 | 6.00 | 8.50 | 8 | 7/8-9 | 1.00 | +0.06/-0.02 | R37 |
| 5-1/8 | 5.16 | 13.00 ± 0.06 | 0.12 | 8.25 | 2.06 | 1.75 | 7.44 | 10.50 | 8 | 1-8 | 1.12 | +0.06/-0.02 | R41 |
| 7-1/16 | 7.16 | 14.00 ± 0.12 | 0.25 | 9.50 | 2.19 | 1.88 | 8.75 | 11.50 | 12 | 1-8 | 1.12 | +0.06/-0.02 | R45 |
| 9 | 9.03 | 16.50 ± 0.12 | 0.25 | 11.88 | 2.50 | 2.19 | 10.75 | 13.75 | 12 | 1-1/8-8 | 1.25 | +0.06/-0.02 | R49 |
| 11 | 11.03 | 20.00 ± 0.12 | 0.25 | 14.00 | 2.81 | 2.50 | 13.50 | 17.00 | 16 | 1-1/4-8 | 1.38 | +0.06/-0.02 | R53 |
| 13-5/8 | 13.66 | 22.00 ± 0.12 | 0.25 | 16.25 | 2.94 | 2.62 | 15.75 | 19.25 | 20 | 1-1/4-8 | 1.38 | +0.06/-0.02 | R57 |
| 16-3/4 | 16.78 | 27.00 ± 0.12 | 0.25 | 20.00 | 3.31 | 3.00 | 19.50 | 23.75 | 20 | 1-1/2-8 | 1.62 | +0.09/-0.02 | R65 |
| 21-1/4 | 21.28 | 32.00 ± 0.12 | 0.25 | 25.00 | 3.88 | 3.50 | 24.00 | 28.50 | 24 | 1-5/8-8 | 1.75 | +0.09/-0.02 | R73 |
| NPS |
Maximum Bore (B) |
Outside Diameter of Flange (OD) |
Maximum Chamfer (C) |
Diameter of Raised Face (K) |
Total Thickness of Flange (T) [+0.12 / -0.12] |
Basic Thickness of Flange (Q) |
Diameter of Hub (X) |
Diameter of Bolt Circle (BC) |
Number of Bolts (N) |
Bolt Size & TPI |
Bolt Holes (BH) Diameter |
Bolt Holes (BH) Tolerance |
Ring Groove Number |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2-1/16 | 53.1 | 165 ± 2 | 3 | 108 | 33.3 | 25.4 | 84.1 | 127.0 | 8 | 5/8-11 | 20 | +2/-0.5 | R23 |
| 2-9/16 | 65.8 | 191 ± 2 | 3 | 127 | 36.6 | 28.4 | 100.1 | 149.4 | 8 | 3/4-10 | 23 | +2/-0.5 | R26 |
| 3-1/8 | 81.8 | 210 ± 2 | 3 | 146 | 39.6 | 31.8 | 117.2 | 168.1 | 8 | 3/4-10 | 23 | +2/-0.5 | R31 |
| 4-1/16 | 108.7 | 273 ± 2 | 3 | 175 | 46.0 | 38.1 | 152.4 | 215.9 | 8 | 7/8-9 | 26 | +2/-0.5 | R37 |
| 5-1/8 | 131.1 | 330 ± 2 | 3 | 210 | 52.3 | 44.5 | 189.0 | 266.7 | 8 | 1-8 | 29 | +2/-0.5 | R41 |
| 7-1/16 | 181.9 | 356 ± 3 | 6 | 241 | 55.6 | 47.8 | 222.3 | 292.1 | 12 | 1-8 | 29 | +2/-0.5 | R45 |
| 9 | 229.4 | 419 ± 3 | 6 | 302 | 63.5 | 55.6 | 273.1 | 349.3 | 12 | 1-1/8-8 | 32 | +2/-0.5 | R49 |
| 11 | 280.2 | 508 ± 3 | 6 | 356 | 71.4 | 63.5 | 342.9 | 431.8 | 16 | 1-1/4-8 | 35 | +2/-0.5 | R53 |
| 13-5/8 | 347.0 | 559 ± 3 | 6 | 413 | 74.7 | 66.5 | 400.1 | 489.0 | 20 | 1-1/4-8 | 35 | +2/-0.5 | R57 |
| 16-3/4 | 426.2 | 686 ± 3 | 6 | 508 | 84.1 | 76.2 | 495.3 | 603.2 | 20 | 1-1/2-8 | 42 | +2.5/-0.5 | R65 |
| 21-1/4 | 540.5 | 813 ± 3 | 6 | 635 | 98.6 | 88.9 | 609.6 | 723.9 | 24 | 1-5/8-8 | 45 | +2.5/-0.5 | R73 |
Dimensions are based on API 6A 2000 PSI (13.8 MPa) flange requirements. Refer to the applicable standard for complete dimensional requirements.
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