Industry Standard Class 125 Light-weight Slip-On Flanges
| Nominal Pipe Size | Outside Diameter (O) | Thickness (T) | Overall Thickness (Y) | Hub Diameter (X) | Inside Diameter (B) | Approximate Weight | Number of Bolt Holes | Diameter of Bolt Holes | Diameter of Bolt Circle (C) |
|---|---|---|---|---|---|---|---|---|---|
| 4 | 9.00 mm | 0.50 mm | 0.88 mm | 5.31 mm | 4.57 mm | 7 lb | 8 | 0.75 mm | 7.50 mm |
| 5 | 10.00 mm | 0.56 mm | 1.25 mm | 6.31 mm | 5.66 mm | 8 lb | 8 | 0.88 mm | 8.50 mm |
| 6 | 11.00 mm | 0.56 mm | 1.25 mm | 7.56 mm | 6.72 mm | 13 lb | 8 | 0.88 mm | 9.50 mm |
| 8 | 13.50 mm | 0.56 mm | 1.25 mm | 9.69 mm | 8.72 mm | 18 lb | 8 | 0.88 mm | 11.75 mm |
| 10 | 16.00 mm | 0.69 mm | 1.25 mm | 12.00 mm | 10.88 mm | 26 lb | 12 | 1.00 mm | 14.25 mm |
| 12 | 19.00 mm | 0.69 mm | 1.25 mm | 14.38 mm | 12.88 mm | 42 lb | 12 | 1.00 mm | 17.00 mm |
| 14 | 21.00 mm | 0.75 mm | 1.25 mm | 15.75 mm | 14.14 mm | 44 lb | 12 | 1.13 mm | 18.75 mm |
| 16 | 23.50 mm | 0.75 mm | 1.25 mm | 18.00 mm | 16.16 mm | 58 lb | 16 | 1.13 mm | 21.25 mm |
| 18 | 25.00 mm | 0.75 mm | 1.25 mm | 19.88 mm | 18.18 mm | 59 lb | 16 | 1.25 mm | 22.75 mm |
| 20 | 27.50 mm | 0.75 mm | 1.25 mm | 22.00 mm | 20.20 mm | 69 lb | 20 | 1.25 mm | 25.00 mm |
| 22 | 29.50 mm | 1.00 mm | 1.75 mm | 24.25 mm | 22.22 mm | 76 lb | 20 | 1.38 mm | 27.25 mm |
| 24 | 32.00 mm | 1.00 mm | 1.75 mm | 26.13 mm | 24.25 mm | 115 lb | 20 | 1.38 mm | 29.50 mm |
| 26 | 34.25 mm | 1.00 mm | 1.75 mm | 28.50 mm | 26.25 mm | 125 lb | 24 | 1.38 mm | 31.75 mm |
| 28 | 36.50 mm | 1.00 mm | 1.75 mm | 30.50 mm | 28.25 mm | 140 lb | 28 | 1.38 mm | 34.00 mm |
| 30 | 38.75 mm | 1.00 mm | 1.75 mm | 32.50 mm | 30.25 mm | 150 lb | 28 | 1.38 mm | 36.00 mm |
| 32 | 41.75 mm | 1.13 mm | 1.75 mm | 34.75 mm | 32.25 mm | 205 lb | 28 | 1.63 mm | 38.50 mm |
| 34 | 43.75 mm | 1.13 mm | 1.75 mm | 36.75 mm | 34.25 mm | 215 lb | 32 | 1.63 mm | 40.50 mm |
| 36 | 46.00 mm | 1.13 mm | 1.75 mm | 38.75 mm | 36.25 mm | 235 lb | 32 | 1.63 mm | 42.75 mm |
| 38 | 48.75 mm | 1.13 mm | 1.75 mm | 40.75 mm | 38.25 mm | 265 lb | 32 | 1.63 mm | 45.25 mm |
| 40 | 50.75 mm | 1.13 mm | 1.75 mm | 43.00 mm | 40.25 mm | 280 lb | 36 | 1.63 mm | 47.25 mm |
| 42 | 53.00 mm | 1.25 mm | 1.75 mm | 45.00 mm | 42.25 mm | 330 lb | 36 | 1.63 mm | 49.50 mm |
| 44 | 55.25 mm | 1.25 mm | 2.25 mm | 47.00 mm | 44.25 mm | 350 lb | 40 | 1.63 mm | 51.75 mm |
| 46 | 57.25 mm | 1.25 mm | 2.25 mm | 49.00 mm | 46.25 mm | 365 lb | 40 | 1.63 mm | 53.75 mm |
| 48 | 59.50 mm | 1.38 mm | 2.50 mm | 51.00 mm | 48.25 mm | 425 lb | 44 | 1.63 mm | 56.00 mm |
| 50 | 61.75 mm | 1.38 mm | 2.50 mm | 53.00 mm | 50.25 mm | 450 lb | 44 | 1.88 mm | 58.25 mm |
| 52 | 64.00 mm | 1.38 mm | 2.50 mm | 55.00 mm | 52.25 mm | 475 lb | 44 | 1.88 mm | 60.50 mm |
| 54 | 66.25 mm | 1.38 mm | 2.50 mm | 57.00 mm | 54.25 mm | 500 lb | 44 | 1.88 mm | 62.75 mm |
| 60 | 73.00 mm | 1.50 mm | 2.75 mm | 63.00 mm | 60.25 mm | 640 lb | 52 | 1.88 mm | 69.25 mm |
| 66 | 80.00 mm | 1.50 mm | 2.75 mm | 69.00 mm | 66.25 mm | 750 lb | 52 | 1.88 mm | 76.00 mm |
| 72 | 86.50 mm | 1.50 mm | 2.75 mm | 75.00 mm | 72.25 mm | 850 lb | 60 | 1.88 mm | 82.50 mm |
| 78 | 93.00 mm | 1.75 mm | 3.00 mm | 81.25 mm | 78.25 mm | 950 lb | 64 | 2.13 mm | 89.00 mm |
| 84 | 99.75 mm | 1.75 mm | 3.00 mm | 87.50 mm | 84.25 mm | 1000 lb | 64 | 2.13 mm | 95.50 mm |
| 90 | 106.50 mm | 2.00 mm | 3.25 mm | 93.75 mm | 90.25 mm | 1500 lb | 68 | 2.38 mm | 102.00 mm |
| 96 | 113.25 mm | 2.00 mm | 3.25 mm | 100.00 mm | 96.25 mm | 1650 lb | 68 | 2.38 mm | 108.50 mm |