Industry Standard Class 175 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 | 31.50 mm | 1.78 mm | 29.00 mm | 405 lb | 29.88 mm | 28 | 0.88 mm |
| 28 | 33.50 mm | 2.00 mm | 31.00 mm | 490 lb | 31.88 mm | 28 | 0.88 mm |
| 30 | 35.75 mm | 2.13 mm | 33.25 mm | 590 lb | 34.13 mm | 36 | 0.88 mm |
| 32 | 37.75 mm | 2.25 mm | 35.25 mm | 700 lb | 36.13 mm | 36 | 0.88 mm |
| 34 | 40.25 mm | 2.38 mm | 37.38 mm | 840 lb | 38.38 mm | 36 | 1.00 mm |
| 36 | 42.25 mm | 2.50 mm | 39.38 mm | 970 lb | 40.38 mm | 36 | 1.00 mm |
| 38 | 44.25 mm | 2.63 mm | 41.38 mm | 1125 lb | 42.38 mm | 36 | 1.00 mm |
| 40 | 46.25 mm | 2.75 mm | 43.38 mm | 1300 lb | 44.38 mm | 40 | 1.00 mm |
| 42 | 49.00 mm | 2.88 mm | 45.75 mm | 1500 lb | 46.88 mm | 40 | 1.13 mm |
| 44 | 51.00 mm | 3.00 mm | 47.75 mm | 1700 lb | 48.88 mm | 40 | 1.13 mm |
| 46 | 53.00 mm | 3.13 mm | 49.75 mm | 1925 lb | 50.88 mm | 40 | 1.13 mm |
| 48 | 55.00 mm | 3.38 mm | 51.75 mm | 2225 lb | 52.88 mm | 44 | 1.13 mm |
| 50 | 57.00 mm | 3.38 mm | 53.75 mm | 2400 lb | 54.88 mm | 44 | 1.13 mm |
| 52 | 59.50 mm | 3.63 mm | 56.00 mm | 2800 lb | 57.25 mm | 44 | 1.25 mm |
| 54 | 61.50 mm | 3.63 mm | 58.00 mm | 3000 lb | 59.25 mm | 44 | 1.25 mm |
| 60 | 67.50 mm | 4.00 mm | 64.00 mm | 4000 lb | 65.25 mm | 48 | 1.25 mm |
| 66 | 73.50 mm | 4.38 mm | 70.00 mm | 5175 lb | 71.25 mm | 56 | 1.25 mm |
| 72 | 80.00 mm | 4.75 mm | 76.50 mm | 6650 lb | 77.75 mm | 64 | 1.25 mm |
| 84 | 94.00 mm | 5.50 mm | 90.13 mm | 10815 lb | 91.50 mm | 72 | 1.38 mm |
| 96 | 106.00 mm | 6.13 mm | 102.13 mm | 15325 lb | 103.50 mm | 88 | 1.38 mm |