Table 2 AWWA C207-18 Class B Ring Flanges
| Nominal Pipe Size | Outside Diameter (O) | Thickness (T) | Inside Diameter (B) | Approximate Weight | Number of Bolt Holes | Diameter of Bolt Holes | Diameter of Bolt Circle (C) |
|---|---|---|---|---|---|---|---|
| 4 | 9.00 mm | 0.63 mm | 4.57 mm | 8 lb | 8 | 0.75 mm | 7.50 mm |
| 5 | 10.00 mm | 0.63 mm | 5.66 mm | 9 lb | 8 | 0.88 mm | 8.50 mm |
| 6 | 11.00 mm | 0.69 mm | 6.72 mm | 11 lb | 8 | 0.88 mm | 9.50 mm |
| 8 | 13.50 mm | 0.69 mm | 8.72 mm | 16 lb | 8 | 0.88 mm | 11.75 mm |
| 10 | 16.00 mm | 0.69 mm | 10.88 mm | 20 lb | 12 | 1.00 mm | 14.25 mm |
| 12 | 19.00 mm | 0.69 mm | 12.88 mm | 30 lb | 12 | 1.00 mm | 17.00 mm |
| 14 | 21.00 mm | 0.69 mm | 14.19 mm | 36 lb | 12 | 1.13 mm | 18.75 mm |
| 16 | 23.50 mm | 0.69 mm | 16.19 mm | 43 lb | 16 | 1.13 mm | 21.25 mm |
| 18 | 25.00 mm | 0.69 mm | 18.19 mm | 43 lb | 16 | 1.25 mm | 22.75 mm |
| 20 | 27.50 mm | 0.69 mm | 20.19 mm | 51 lb | 20 | 1.25 mm | 25.00 mm |
| 22 | 29.50 mm | 0.75 mm | 22.19 mm | 60 lb | 20 | 1.38 mm | 27.25 mm |
| 24 | 32.00 mm | 0.75 mm | 24.19 mm | 70 lb | 20 | 1.38 mm | 29.50 mm |
| 26 | 34.25 mm | 0.81 mm | 26.19 mm | 84 lb | 24 | 1.38 mm | 31.75 mm |
| 28 | 36.50 mm | 0.88 mm | 28.19 mm | 99 lb | 28 | 1.38 mm | 34.00 mm |
| 30 | 38.75 mm | 0.88 mm | 30.19 mm | 110 lb | 28 | 1.38 mm | 36.00 mm |
| 32 | 41.75 mm | 0.94 mm | 32.19 mm | 139 lb | 28 | 1.63 mm | 38.50 mm |
| 34 | 43.75 mm | 0.94 mm | 34.19 mm | 149 lb | 32 | 1.63 mm | 40.50 mm |
| 36 | 46.00 mm | 1.00 mm | 36.19 mm | 169 lb | 32 | 1.63 mm | 42.75 mm |
| 38 | 48.75 mm | 1.00 mm | 38.19 mm | 195 lb | 32 | 1.63 mm | 45.25 mm |
| 40 | 50.75 mm | 1.00 mm | 40.19 mm | 203 lb | 36 | 1.63 mm | 47.25 mm |
| 42 | 53.00 mm | 1.13 mm | 42.19 mm | 246 lb | 36 | 1.63 mm | 49.50 mm |
| 44 | 55.25 mm | 1.13 mm | 44.19 mm | 262 lb | 40 | 1.63 mm | 51.75 mm |
| 46 | 57.25 mm | 1.13 mm | 46.19 mm | 274 lb | 40 | 1.63 mm | 53.75 mm |
| 48 | 59.50 mm | 1.25 mm | 48.19 mm | 323 lb | 44 | 1.63 mm | 56.00 mm |
| 50 | 61.75 mm | 1.25 mm | 50.19 mm | 334 lb | 44 | 1.88 mm | 58.25 mm |
| 52 | 64.00 mm | 1.25 mm | 52.19 mm | 356 lb | 44 | 1.88 mm | 60.50 mm |
| 54 | 66.25 mm | 1.38 mm | 54.19 mm | 418 lb | 44 | 1.88 mm | 62.75 mm |
| 60 | 73.00 mm | 1.50 mm | 60.19 mm | 535 lb | 52 | 1.88 mm | 69.25 mm |
| 66 | 80.00 mm | 1.63 mm | 66.19 mm | 699 lb | 52 | 1.88 mm | 76.00 mm |
| 72 | 86.50 mm | 1.75 mm | 72.19 mm | 844 lb | 60 | 1.88 mm | 82.50 mm |
| 78 | 93.00 mm | 2.00 mm | 78.19 mm | 1052 lb | 64 | 2.13 mm | 89.00 mm |
| 84 | 99.75 mm | 2.00 mm | 84.19 mm | 1205 lb | 64 | 2.13 mm | 95.50 mm |
| 90 | 106.50 mm | 2.25 mm | 90.19 mm | 1478 lb | 68 | 2.44 mm | 102.00 mm |
| 96 | 113.25 mm | 2.25 mm | 96.19 mm | 1670 lb | 68 | 2.44 mm | 108.50 mm |
| 102 | 120.00 mm | 2.50 mm | 102.19 mm | 2013 lb | 72 | 2.69 mm | 114.50 mm |
| 108 | 126.75 mm | 2.50 mm | 108.19 mm | 2249 lb | 72 | 2.69 mm | 120.75 mm |
| 114 | 133.50 mm | 2.75 mm | 114.19 mm | 2658 lb | 76 | 2.94 mm | 126.75 mm |
| 120 | 140.25 mm | 2.75 mm | 120.19 mm | 2943 lb | 76 | 2.94 mm | 132.75 mm |
| 126 | 147.00 mm | 3.00 mm | 126.19 mm | 3423 lb | 80 | 3.19 mm | 139.25 mm |
| 132 | 153.75 mm | 3.00 mm | 132.19 mm | 3761 lb | 80 | 3.19 mm | 145.75 mm |
| 138 | 160.50 mm | 3.25 mm | 138.19 mm | 4317 lb | 84 | 3.44 mm | 152.00 mm |
| 144 | 167.25 mm | 3.25 mm | 144.19 mm | 4711 lb | 84 | 3.44 mm | 158.25 mm |