| 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 Class D (T) |
|---|---|---|---|---|---|---|
| 4 | 9.00 | 4.57 | 8 | 7.50 | 0.625 | 0.625 |
| 5 | 10.00 | 5.66 | 8 | 8.50 | 0.750 | 0.625 |
| 6 | 11.00 | 6.72 | 8 | 9.50 | 0.750 | 0.688 |
| 8 | 13.50 | 8.72 | 8 | 11.75 | 0.750 | 0.688 |
| 10 | 16.00 | 10.88 | 12 | 14.25 | 0.875 | 0.688 |
| 12 | 19.00 | 12.88 | 12 | 17.00 | 0.875 | 0.812 |
| 14 | 21.00 | 14.19 | 12 | 18.75 | 1.000 | 0.938 |
| 16 | 23.50 | 16.19 | 16 | 21.25 | 1.000 | 1.000 |
| 18 | 25.00 | 18.19 | 16 | 22.75 | 1.125 | 1.062 |
| 20 | 27.50 | 20.19 | 20 | 25.00 | 1.125 | 1.125 |
| 22 | 29.50 | 22.19 | 20 | 27.25 | 1.250 | 1.188 |
| 24 | 32.00 | 24.19 | 20 | 29.50 | 1.250 | 1.250 |
| 26 | 34.25 | 24 | 31.75 | 1.250 | 1.312 | |
| 28 | 36.50 | 28 | 34.00 | 1.250 | 1.312 | |
| 30 | 38.75 | 28 | 36.00 | 1.250 | 1.375 | |
| 32 | 41.75 | 28 | 38.50 | 1.500 | 1.500 | |
| 34 | 43.75 | 32 | 40.50 | 1.500 | 1.500 | |
| 36 | 46.00 | 32 | 42.75 | 1.500 | 1.625 | |
| 38 | 48.75 | 32 | 45.25 | 1.500 | 1.625 | |
| 40 | 50.75 | 36 | 47.25 | 1.500 | 1.625 | |
| 42 | 53.00 | 36 | 49.50 | 1.500 | 1.750 | |
| 44 | 55.25 | 40 | 51.75 | 1.500 | 1.750 | |
| 46 | 57.25 | 40 | 53.75 | 1.500 | 1.750 | |
| 48 | 59.50 | 44 | 56.00 | 1.500 | 1.875 | |
| 50 | 61.75 | 44 | 58.25 | 1.750 | 2.000 | |
| 52 | 64.00 | 44 | 60.50 | 1.750 | 2.000 | |
| 54 | 66.25 | 44 | 62.75 | 1.750 | 2.125 | |
| 60 | 73.00 | 52 | 69.25 | 1.750 | 2.250 | |
| 66 | 80.00 | 52 | 76.00 | 1.750 | 2.500 | |
| 72 | 86.50 | 60 | 82.50 | 1.750 | 2.625 | |
| 78 | 93.00 | 64 | 89.00 | 2.000 | 2.750 | |
| 84 | 99.75 | 64 | 95.50 | 2.000 | 2.875 | |
| 90 | 106.50 | 68 | 102.00 | 2.250 | 3.000 | |
| 96 | 113.25 | 68 | 108.50 | 2.250 | 3.250 | |
| 102 | 120.00 | 72 | 114.50 | 2.500 | 3.250 | |
| 108 | 126.75 | 72 | 120.75 | 2.500 | 3.375 | |
| 114 | 133.50 | 76 | 126.75 | 2.750 | 3.500 | |
| 120 | 140.25 | 76 | 132.75 | 2.750 | 3.500 | |
| 126 | 147.00 | 80 | 139.25 | 3.000 | 3.750 | |
| 132 | 153.75 | 80 | 145.75 | 3.000 | 3.875 | |
| 144 | 167.25 | 84 | 158.25 | 3.250 | 4.125 |
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.
Precision Engineering. Technical Expertise. Global Supply.
