ANSI / ASME B16.47 Series B Class 400 Weld Neck Flange Dimensions
| Nominal Pipe Size | Outside Diameter (O) | Min Thickness (T) | Raised Face Diameter (R) | Approximate Weight (lbs) | Bolt Circle (C) | Number of Holes | Diameter of Holes |
|---|---|---|---|---|---|---|---|
| 26 | 33.50 | 3.50 | 28.00 | 875 | 30.75 | 28 | 1.50 |
| 28 | 36.00 | 3.75 | 30.00 | 1081 | 33.00 | 24 | 1.62 |
| 30 | 38.25 | 4.00 | 32.25 | 1302 | 35.25 | 28 | 1.62 |
| 32 | 40.75 | 4.25 | 34.38 | 1570 | 37.50 | 28 | 1.75 |
| 34 | 42.75 | 4.38 | 36.50 | 1780 | 39.50 | 32 | 1.75 |
| 36 | 45.50 | 4.69 | 38.62 | 2160 | 42.00 | 28 | 1.88 |
*Use 25.4 as a factor to convert into mm.