ASME B16.47 Class 400 Series B Blind Flanges
| Nominal Pipe Size | Outside Diameter (O) | Minimum Thickness (T) | Raised Face Diameter (R) | Approximate Weight | Bolt Circle (C) | Number of Holes | Diameter of Holes |
|---|---|---|---|---|---|---|---|
| 26 | 33.50 mm | 3.50 mm | 28.00 mm | 875 lb | 30.75 mm | 28 | 1.50 mm |
| 28 | 36.00 mm | 3.75 mm | 30.00 mm | 1081 lb | 33.00 mm | 24 | 1.62 mm |
| 30 | 38.25 mm | 4.00 mm | 32.25 mm | 1302 lb | 35.25 mm | 28 | 1.62 mm |
| 32 | 40.75 mm | 4.25 mm | 34.38 mm | 1570 lb | 37.50 mm | 28 | 1.75 mm |
| 34 | 42.75 mm | 4.38 mm | 36.50 mm | 1780 lb | 39.50 mm | 32 | 1.75 mm |
| 36 | 45.50 mm | 4.69 mm | 38.62 mm | 2160 lb | 42.00 mm | 28 | 1.88 mm |