Industry Standard Class 125/150 Blind Flanges
| Nominal Pipe Size | Outside Diameter (O) | Thickness (T) | Approximate Weight | Number of Bolt Holes | Diameter of Bolt Holes | Diameter of Bolt Circle (C) |
|---|---|---|---|---|---|---|
| 26 | 34.25 mm | 2.00 mm | 260 lb | 24 | 1.38 mm | 31.75 mm |
| 28 | 36.50 mm | 2.06 mm | 295 lb | 28 | 1.38 mm | 34.00 mm |
| 30 | 38.75 mm | 2.13 mm | 340 lb | 28 | 1.38 mm | 36.00 mm |
| 32 | 41.75 mm | 2.25 mm | 410 lb | 28 | 1.63 mm | 38.50 mm |
| 34 | 43.75 mm | 2.31 mm | 440 lb | 32 | 1.63 mm | 40.50 mm |
| 36 | 46.00 mm | 2.38 mm | 495 lb | 32 | 1.63 mm | 42.75 mm |
| 38 | 48.75 mm | 2.38 mm | 570 lb | 32 | 1.63 mm | 45.25 mm |
| 40 | 50.75 mm | 2.50 mm | 620 lb | 36 | 1.63 mm | 47.25 mm |
| 42 | 53.00 mm | 2.63 mm | 710 lb | 36 | 1.63 mm | 49.50 mm |
| 44 | 55.25 mm | 2.63 mm | 750 lb | 40 | 1.63 mm | 51.75 mm |
| 46 | 57.25 mm | 2.69 mm | 800 lb | 40 | 1.63 mm | 53.75 mm |
| 48 | 59.50 mm | 2.75 mm | 870 lb | 44 | 1.63 mm | 56.00 mm |
| 50 | 61.75 mm | 2.75 mm | 900 lb | 44 | 1.88 mm | 58.25 mm |
| 52 | 64.00 mm | 2.88 mm | 1000 lb | 44 | 1.88 mm | 60.50 mm |
| 54 | 66.25 mm | 3.00 mm | 1100 lb | 44 | 1.88 mm | 62.75 mm |
| 60 | 73.00 mm | 3.13 mm | 1350 lb | 52 | 1.88 mm | 69.25 mm |
| 66 | 80.00 mm | 3.38 mm | 1775 lb | 52 | 1.88 mm | 76.00 mm |
| 72 | 86.50 mm | 3.50 mm | 2100 lb | 60 | 1.88 mm | 82.50 mm |
| 84 | 99.75 mm | 3.88 mm | 2825 lb | 64 | 2.13 mm | 95.50 mm |
| 96 | 113.25 mm | 4.25 mm | 3800 lb | 68 | 2.38 mm | 108.50 mm |