| NPS |
Outside Diameter of Flange (OD) |
Diameter of Raised Face (K) |
Total Thickness of Flange (T) [+0.12 / -0.12] |
Counterbore Depth (E) [+0.02 / -0.02] |
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 | 6.50 ± 0.06 | 4.25 | 1.31 | 0.31 | 5.00 | 8 | 5/8-11 | 0.75 | +0.06/-0.02 | R23 |
| 2-9/16 | 7.50 ± 0.06 | 5.00 | 1.44 | 0.31 | 5.88 | 8 | 3/4-10 | 0.88 | +0.06/-0.02 | R26 |
| 3-1/8 | 8.25 ± 0.06 | 5.75 | 1.56 | 0.31 | 6.62 | 8 | 3/4-10 | 0.88 | +0.06/-0.02 | R31 |
| 4-1/16 | 10.75 ± 0.06 | 6.88 | 1.81 | 0.31 | 8.50 | 8 | 7/8-9 | 1.00 | +0.06/-0.02 | R37 |
| 5-1/8 | 13.00 ± 0.06 | 8.25 | 2.06 | 0.31 | 10.50 | 8 | 1-8 | 1.12 | +0.06/-0.02 | R41 |
| 7-1/16 | 14.00 ± 0.12 | 9.50 | 2.19 | 0.31 | 11.50 | 12 | 1-8 | 1.12 | +0.06/-0.02 | R45 |
| 9 | 16.50 ± 0.12 | 11.88 | 2.50 | 0.31 | 13.75 | 12 | 1-1/8-8 | 1.25 | +0.06/-0.02 | R49 |
| 11 | 20.00 ± 0.12 | 14.00 | 2.81 | 0.31 | 17.00 | 16 | 1-1/4-8 | 1.38 | +0.06/-0.02 | R53 |
| 13-5/8 | 22.00 ± 0.12 | 16.25 | 2.94 | 0.31 | 19.25 | 20 | 1-1/4-8 | 1.38 | +0.06/-0.02 | R57 |
| 16-3/4 | 27.00 ± 0.12 | 20.00 | 3.31 | 0.31 | 23.75 | 20 | 1-1/2-8 | 1.62 | +0.09/-0.02 | R65 |
| 21-1/4 | 32.00 ± 0.12 | 25.00 | 3.88 | 0.38 | 28.50 | 24 | 1-5/8-8 | 1.75 | +0.09/-0.02 | R73 |
| NPS |
Outside Diameter of Flange (OD) |
Diameter of Raised Face (K) |
Total Thickness of Flange (T) [+0.12 / -0.12] |
Counterbore Depth (E) [+0.02 / -0.02] |
Diameter of Bolt Circle (BC) |
Number of Bolts (N) |
Bolt Size & TPI |
Bolt Holes (BH) Diameter |
Bolt Holes (BH) Tolerance |
Ring Groove Number |
|---|---|---|---|---|---|---|---|---|---|---|
| 2-1/6 | 165 ± 2 | 108 | 33.3 | 7.9 | 127.0 | 8 | 5/8-11 | 20 | +2/-0.5 | R23 |
| 2-9/16 | 191 ± 2 | 127 | 36.6 | 7.9 | 149.4 | 8 | 3/4-10 | 23 | +2/-0.5 | R26 |
| 3-1/8 | 210 ± 2 | 146 | 39.6 | 7.9 | 168.1 | 8 | 3/4-10 | 23 | +2/-0.5 | R31 |
| 4-1/16 | 273 ± 2 | 175 | 46.0 | 7.9 | 215.9 | 8 | 7/8-9 | 26 | +2/-0.5 | R37 |
| 5-1/8 | 330 ± 2 | 210 | 52.3 | 7.9 | 266.7 | 8 | 1-8 | 29 | +2/-0.5 | R41 |
| 7-1/16 | 356 ± 3 | 241 | 55.6 | 7.9 | 292.1 | 12 | 1-8 | 29 | +2/-0.5 | R45 |
| 9 | 419 ± 3 | 302 | 63.5 | 7.9 | 349.3 | 12 | 1-1/8-8 | 32 | +2/-0.5 | R49 |
| 11 | 508 ± 3 | 356 | 71.4 | 7.9 | 431.8 | 16 | 1-1/4-8 | 35 | +2/-0.5 | R53 |
| 13-5/8 | 559 ± 3 | 413 | 74.7 | 7.9 | 489.0 | 20 | 1-1/4-8 | 35 | +2/-0.5 | R57 |
| 16-3/4 | 686 ± 3 | 508 | 84.1 | 7.9 | 603.2 | 20 | 1-1/2-8 | 42 | +2.5/-0.5 | R65 |
| 21-1/4 | 813 ± 3 | 635 | 98.6 | 9.7 | 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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