ASME B16.47 Class 900 Series B Welding Neck Flanges
| Nominal Pipe Size | Outside Diameter (O) | Maximum 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 | Bolt Circle (C) | Number of Holes | Diameter of Holes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 26 | 40.25 mm | 5.31 mm | 30.00 mm | 10.19 mm | 29.25 mm | 0.44 mm | 26.00 mm | Specified by purchaser | 1050 lb | 35.50 mm | 20 | 2.62 mm |
| 28 | 43.50 mm | 5.81 mm | 32.25 mm | 10.88 mm | 31.38 mm | 0.50 mm | 28.00 mm | Specified by purchaser | 1520 lb | 38.25 mm | 20 | 2.88 mm |
| 30 | 46.50 mm | 6.12 mm | 34.50 mm | 11.38 mm | 33.50 mm | 0.50 mm | 30.00 mm | Specified by purchaser | 1820 lb | 40.75 mm | 20 | 3.12 mm |
| 32 | 48.75 mm | 6.31 mm | 36.50 mm | 11.94 mm | 35.75 mm | 0.50 mm | 32.00 mm | Specified by purchaser | 2065 lb | 43.00 mm | 20 | 3.12 mm |
| 34 | 51.75 mm | 6.75 mm | 39.00 mm | 12.56 mm | 37.88 mm | 0.56 mm | 34.00 mm | Specified by purchaser | 2450 lb | 45.50 mm | 20 | 3.38 mm |
| 36 | 53.00 mm | 6.81 mm | 40.50 mm | 12.81 mm | 40.00 mm | 0.56 mm | 36.00 mm | Specified by purchaser | 2520 lb | 47.25 mm | 24 | 3.12 mm |