| 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 |
Hub Length Threaded Flange Line Pipe Flange |
Hub Length Threaded Flange Casting Flange |
Hub Length Threaded Flange Tubing Flange |
Ring Groove Number |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2-1/6 | 2.09 | 8.50 ± 0.06 | 0.12 | 4.88 | 1.81 | 1.50 | 4.12 | 6.50 | 8 | 7/8-9 | 1.00 | +0.06/-0.02 | 2.56 | - | 2.56 | R24 |
| 2-9/16 | 2.59 | 9.62 ± 0.06 | 0.12 | 5.38 | 1.94 | 1.62 | 4.88 | 7.50 | 8 | 1-8 | 1.12 | +0.06/-0.02 | 2.81 | - | 2.81 | R27 |
| 3-1/8 | 3.22 | 9.50 ± 0.06 | 0.12 | 6.12 | 1.81 | 1.50 | 5.00 | 7.50 | 8 | 7/8-9 | 1.00 | +0.06/-0.02 | 2.44 | - | 2.94 | R31 |
| 4-1/16 | 4.28 | 11.50 ± 0.06 | 0.12 | 7.12 | 2.06 | 1.75 | 6.25 | 9.25 | 8 | 1-1/8-8 | 1.25 | +0.06/-0.02 | 3.06 | 3.50 | 3.50 | R37 |
| 5-1/8 | 5.16 | 13.75 ± 0.06 | 0.12 | 8.50 | 2.31 | 2.00 | 7.50 | 11.00 | 8 | 1-1/4-8 | 1.38 | +0.06/-0.02 | 3.44 | 4.00 | - | R41 |
| 7-1/16 | 7.16 | 15.00 ± 0.12 | 0.25 | 9.50 | 2.50 | 2.19 | 9.25 | 12.50 | 12 | 1-1/8-8 | 1.25 | +0.06/-0.02 | 3.69 | 4.50 | - | R45 |
| 9 | 9.03 | 18.50 ± 0.12 | 0.25 | 12.12 | 2.81 | 2.50 | 11.75 | 15.50 | 12 | 1-3/8-8 | 1.50 | +0.06/-0.02 | 4.31 | 5.00 | - | R49 |
| 11 | 11.03 | 21.50 ± 0.12 | 0.25 | 14.25 | 3.06 | 2.75 | 14.50 | 18.50 | 16 | 1-3/8-8 | 1.50 | +0.06/-0.02 | 4.56 | 5.25 | - | R53 |
| 13-5/8 | 13.66 | 24.00 ± 0.12 | 0.25 | 16.50 | 3.44 | 3.12 | 16.50 | 21.00 | 20 | 1-3/8-8 | 1.50 | +0.06/-0.02 | 4.94 | 4.94 | - | R57 |
| 16-3/4 | 16.78 | 27.75 ± 0.12 | 0.25 | 20.62 | 3.94 | 3.50 | 20.00 | 24.25 | 20 | 1-5/8-8 | 1.75 | +0.09/-0.02 | 5.06 | 5.69 | - | R66 |
| 20-3/4 | 20.78 | 33.75 ± 0.12 | 0.25 | 25.50 | 4.75 | 4.25 | 24.50 | 29.50 | 20 | 2-8 | 2.12 | +0.09/-0.02 | 6.75 | 6.75 | - | R74 |
| 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 |
Hub Length Threaded Flange Line Pipe Flange |
Hub Length Threaded Flange Casting Flange |
Hub Length Threaded Flange Tubing Flange |
Ring Groove Number |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2-1/6 | 53.1 | 216 ± 2 | 3 | 124 | 46.0 | 38.1 | 104.6 | 165.1 | 8 | 7/8-9 | 26 | +2/-0.5 | 65.0 | - | 65.0 | R24 |
| 2-9/16 | 65.8 | 244 ± 2 | 3 | 137 | 49.3 | 41.1 | 124.0 | 190.5 | 8 | 1-8 | 29 | +2/-0.5 | 71.4 | - | 71.4 | R27 |
| 3-1/8 | 81.8 | 241 ± 2 | 3 | 155 | 46.0 | 38.1 | 127.0 | 190.5 | 8 | 7/8-9 | 26 | +2/-0.5 | 62.0 | - | 74.7 | R31 |
| 4-1/16 | 108.7 | 292 ± 2 | 3 | 181 | 52.4 | 44.4 | 158.8 | 235.0 | 8 | 1-1/8-8 | 32 | +2/-0.5 | 77.7 | 88.9 | 88.9 | R37 |
| 5-1/8 | 131.1 | 349 ± 2 | 3 | 216 | 58.7 | 50.8 | 190.5 | 279.4 | 8 | 1-1/4-8 | 35 | +2/-0.5 | 87.4 | 101.6 | - | R41 |
| 7-1/16 | 181.9 | 381 ± 3 | 6 | 241 | 63.5 | 55.6 | 235.0 | 317.5 | 12 | 1-1/8-8 | 32 | +2/-0.5 | 93.7 | 114.3 | - | R45 |
| 9 | 229.4 | 470 ± 3 | 6 | 308 | 71.4 | 63.5 | 298.5 | 393.7 | 12 | 1-3/8-8 | 39 | +2/-0.5 | 109.5 | 127.0 | - | R49 |
| 11 | 280.2 | 546 ± 3 | 6 | 362 | 77.8 | 69.9 | 368.3 | 469.9 | 16 | 1-3/8-8 | 39 | +2/-0.5 | 115.8 | 133.4 | - | R53 |
| 13-5/8 | 347.0 | 610 ± 3 | 6 | 419 | 87.4 | 79.2 | 419.1 | 533.4 | 20 | 1-3/8-8 | 39 | +2/-0.5 | 125.5 | 125.5 | - | R57 |
| 16-3/4 | 426.2 | 705 ± 3 | 6 | 524 | 100.1 | 88.9 | 508.0 | 616.0 | 20 | 1-5/8-8 | 45 | +2.5/-0.5 | 128.5 | 144.5 | - | R66 |
| 20-3/4 | 527.8 | 857 ± 3 | 6 | 648 | 120.7 | 108.0 | 622.3 | 749.3 | 20 | 2-8 | 54 | +2.5/-0.5 | 171.5 | 171.5 | - | 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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