| NPS |
OD of a Flange (A) |
ID of a Flange (B) |
Number of Bolts |
Diameter of Bolt Circle (C) |
Diameter of Bolts |
Thickness of Flange(T) |
|---|---|---|---|---|---|---|
| 4 | 10.00 | 4.57 | 8 | 7.88 | 0.750 | 1.13 |
| 5 | 11.00 | 5.66 | 8 | 9.25 | 0.750 | 1.21 |
| 6 | 12.50 | 6.73 | 12 | 10.62 | 0.750 | 1.31 |
| 8 | 15.00 | 8.73 | 12 | 13.00 | 0.875 | 1.31 |
| 10 | 17.50 | 10.88 | 16 | 15.25 | 1.000 | 1.50 |
| 12 | 20.50 | 12.88 | 16 | 17.75 | 1.125 | 1.63 |
| 14 | 23.00 | 14.19 | 20 | 20.25 | 1.125 | 1.94 |
| 16 | 25.50 | 16.19 | 20 | 22.50 | 1.250 | 2.14 |
| 18 | 28.00 | 18.19 | 24 | 24.75 | 1.250 | 2.25 |
| 20 | 30.50 | 20.19 | 24 | 27.00 | 1.250 | 2.33 |
| 22 | 33.00 | 22.19 | 24 | 29.25 | 1.500 | 2.50 |
| 24 | 36.00 | 24.19 | 24 | 32.00 | 1.500 | 2.69 |
| 26 | 38.25 | 28 | 34.50 | 1.750 | 3.00 | |
| 28 | 40.75 | 28 | 37.00 | 1.750 | 3.13 | |
| 30 | 43.00 | 28 | 39.25 | 1.750 | 3.15 | |
| 32 | 45.25 | 28 | 41.50 | 1.750 | 3.25 | |
| 34 | 47.50 | 28 | 43.50 | 1.750 | 3.38 | |
| 36 | 50.00 | 32 | 46.00 | 2.000 | 3.46 | |
| 38 | 52.25 | 32 | 48.00 | 2.000 | 3.50 | |
| 40 | 54.25 | 36 | 50.25 | 2.000 | 3.63 | |
| 42 | 57.00 | 36 | 52.75 | 2.000 | 3.81 | |
| 44 | 59.25 | 36 | 55.00 | 2.000 | 4.00 | |
| 46 | 61.50 | 40 | 57.25 | 2.000 | 4.13 | |
| 48 | 65.00 | 40 | 60.75 | 2.000 | 4.50 |
1. Ring flanges may be overbored or counterbored to accommodate larger outside-diameter (OD) pipe than shown as nominal. This is done to allow a clear inside diameter (ID) after cement-mortar lining. Wrench clearance between the pipe OD and bolt circle, as well as sufficient gasket seating area, must be maintained.
2. Metric conversion—nominal pipe size: in. × 25 = mm; dimensions: in. × 25.4 = mm; psi × 6.895 = kPa.
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