| 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 | 8.50 ± 0.06 | 4.88 | 1.81 | 0.31 | 6.50 | 8 | 7/8-9 | 1.00 | +0.06/-0.02 | R24 |
| 2-9/16 | 9.62 ± 0.06 | 5.38 | 1.94 | 0.31 | 7.50 | 8 | 1-8 | 1.12 | +0.06/-0.02 | R27 |
| 3-1/8 | 9.50 ± 0.06 | 6.12 | 1.81 | 0.31 | 7.50 | 8 | 7/8-9 | 1.00 | +0.06/-0.02 | R31 |
| 4-1/16 | 11.50 ± 0.06 | 7.12 | 2.06 | 0.31 | 9.25 | 8 | 1-1/8-8 | 1.25 | +0.06/-0.02 | R37 |
| 5-1/8 | 13.75 ± 0.06 | 8.50 | 2.31 | 0.31 | 11.00 | 8 | 1-1/4-8 | 1.38 | +0.06/-0.02 | R41 |
| 7-1/16 | 15.00 ± 0.12 | 9.50 | 2.50 | 0.31 | 12.50 | 12 | 1-1/8-8 | 1.25 | +0.06/-0.02 | R45 |
| 9 | 18.50 ± 0.12 | 12.12 | 2.81 | 0.31 | 15.50 | 12 | 1-3/8-8 | 1.50 | +0.06/-0.02 | R49 |
| 11 | 21.50 ± 0.12 | 14.25 | 3.06 | 0.31 | 18.50 | 16 | 1-3/8-8 | 1.50 | +0.06/-0.02 | R53 |
| 13-5/8 | 24.00 ± 0.12 | 16.50 | 3.44 | 0.31 | 21.00 | 20 | 1-3/8-8 | 1.50 | +0.06/-0.02 | R57 |
| 16-3/4 | 27.75 ± 0.12 | 20.62 | 3.94 | 0.44 | 24.25 | 20 | 1-5/8-8 | 1.75 | +0.09/-0.02 | R66 |
| 20-3/4 | 33.75 ± 0.12 | 25.50 | 4.75 | 0.50 | 29.50 | 20 | 2-8 | 2.12 | +0.09/-0.02 | R74 |
| 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 | 216 ± 2 | 124 | 46.0 | 7.9 | 165.1 | 8 | 7/8-9 | 26 | +2/-0.5 | R24 |
| 2-9/16 | 244 ± 2 | 137 | 49.3 | 7.9 | 190.5 | 8 | 1-8 | 29 | +2/-0.5 | R27 |
| 3-1/8 | 241 ± 2 | 155 | 46.0 | 7.9 | 190.5 | 8 | 7/8-9 | 26 | +2/-0.5 | R31 |
| 4-1/16 | 292 ± 2 | 181 | 52.4 | 7.9 | 235.0 | 8 | 1-1/8-8 | 32 | +2/-0.5 | R37 |
| 5-1/8 | 349 ± 2 | 216 | 58.7 | 7.9 | 279.4 | 8 | 1-1/4-8 | 35 | +2/-0.5 | R41 |
| 7-1/16 | 381 ± 3 | 241 | 63.5 | 7.9 | 317.5 | 12 | 1-1/8-8 | 32 | +2/-0.5 | R45 |
| 9 | 470 ± 3 | 308 | 71.4 | 7.9 | 393.7 | 12 | 1-3/8-8 | 39 | +2/-0.5 | R49 |
| 11 | 546 ± 3 | 362 | 77.8 | 7.9 | 469.9 | 16 | 1-3/8-8 | 39 | +2/-0.5 | R53 |
| 13-5/8 | 610 ± 3 | 419 | 87.4 | 7.9 | 533.4 | 20 | 1-3/8-8 | 39 | +2/-0.5 | R57 |
| 16-3/4 | 705 ± 3 | 524 | 100.1 | 11.2 | 616.0 | 20 | 1-5/8-8 | 45 | +2.5/-0.5 | R66 |
| 20-3/4 | 857 ± 3 | 648 | 120.7 | 12.7 | 749.3 | 20 | 2-8 | 54 | +2.5/-0.5 | R74 |
Dimensions are based on API 6A 3000 PSI (20.7 MPa) flange requirements. Refer to the applicable standard for complete dimensional requirements.
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