ANSI / ASME B16.47 Series B Class 900 Weld Neck Flange Dimensions
| Nominal Pipe Size | Outside Diameter (O) | Min Thickness (T) | Raised Face Diameter (R) | Length Thru Hub (Y) | Hub Diameter (X) | Minimum Fillet Radius (r) | Top of Hub (A) | Bore (B) | Approximate Weight (lbs) | Bolt Circle (C) | Number of Holes | Diameter of Holes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 26 | 40.25 | 5.31 | 30.00 | 10.19 | 29.25 | 0.44 | 26.00 | Specified by purchaser | 1050 | 35.50 | 20 | 2.62 |
| 28 | 43.50 | 5.81 | 32.25 | 10.88 | 31.38 | 0.50 | 28.00 | Specified by purchaser | 1520 | 38.25 | 20 | 2.88 |
| 30 | 46.50 | 6.12 | 34.50 | 11.38 | 33.50 | 0.50 | 30.00 | Specified by purchaser | 1820 | 40.75 | 20 | 3.12 |
| 32 | 48.75 | 6.31 | 36.50 | 11.94 | 35.75 | 0.50 | 32.00 | Specified by purchaser | 2065 | 43.00 | 20 | 3.12 |
| 34 | 51.75 | 6.75 | 39.00 | 12.56 | 37.88 | 0.56 | 34.00 | Specified by purchaser | 2450 | 45.50 | 20 | 3.38 |
| 36 | 53.00 | 6.81 | 40.50 | 12.81 | 40.00 | 0.56 | 36.00 | Specified by purchaser | 2520 | 47.25 | 24 | 3.12 |
*Use 25.4 as a factor to convert into mm.