Industry Standard Class 250 Blind Flanges
| Nominal Pipe Size | Outside Diameter (O) | Thickness (T) | Raised Face Diameter (R) | Approximate Weight | Bolt Circle (C) | Number of Holes | Diameter of Bolt Holes |
|---|---|---|---|---|---|---|---|
| 26 | 38.25 mm | 2.81 mm | 32.44 mm | 853 lb | 34.50 mm | 28 | 1.88 mm |
| 28 | 40.75 mm | 2.94 mm | 34.94 mm | 1022 lb | 37.00 mm | 28 | 1.88 mm |
| 30 | 43.00 mm | 3.00 mm | 37.19 mm | 1168 lb | 39.25 mm | 28 | 1.88 mm |
| 32 | 45.25 mm | 3.12 mm | 39.44 mm | 1353 lb | 41.50 mm | 28 | 1.88 mm |
| 34 | 47.50 mm | 3.25 mm | 41.44 mm | 1560 lb | 43.50 mm | 28 | 1.88 mm |
| 36 | 50.00 mm | 3.38 mm | 43.69 mm | 1792 lb | 46.00 mm | 32 | 2.13 mm |
| 38 | 52.25 mm | 3.44 mm | 45.69 mm | 2003 lb | 48.00 mm | 32 | 2.13 mm |
| 40 | 54.50 mm | 3.56 mm | 47.94 mm | 2223 lb | 50.25 mm | 36 | 2.13 mm |
| 42 | 57.00 mm | 3.69 mm | 50.44 mm | 2533 lb | 52.75 mm | 36 | 2.13 mm |
| 44 | 59.25 mm | 3.75 mm | 52.69 mm | 2793 lb | 55.00 mm | 36 | 2.13 mm |
| 46 | 61.50 mm | 3.88 mm | 54.94 mm | 3109 lb | 57.25 mm | 40 | 2.13 mm |
| 48 | 65.00 mm | 4.00 mm | 58.44 mm | 3599 lb | 60.75 mm | 40 | 2.13 mm |