ASME B16.47 Class 400 Series B Welding Neck Flanges
| Nominal Pipe Size | Outside Diameter (O) | Minimum 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 | 33.50 mm | 3.50 mm | 28.00 mm | 5.88 mm | 27.12 mm | 0.44 mm | 26.00 mm | Specified by purchaser | 360 lb | 30.75 mm | 28 | 1.50 mm |
| 28 | 36.00 mm | 3.75 mm | 30.00 mm | 6.25 mm | 29.12 mm | 0.50 mm | 28.00 mm | Specified by purchaser | 450 lb | 33.00 mm | 24 | 1.62 mm |
| 30 | 38.25 mm | 4.00 mm | 32.25 mm | 6.69 mm | 31.25 mm | 0.50 mm | 30.00 mm | Specified by purchaser | 530 lb | 35.25 mm | 28 | 1.62 mm |
| 32 | 40.75 mm | 4.25 mm | 34.38 mm | 7.06 mm | 33.25 mm | 0.50 mm | 32.00 mm | Specified by purchaser | 635 lb | 37.50 mm | 28 | 1.75 mm |
| 34 | 42.75 mm | 4.38 mm | 36.50 mm | 7.38 mm | 35.38 mm | 0.56 mm | 34.00 mm | Specified by purchaser | 690 lb | 39.50 mm | 32 | 1.75 mm |
| 36 | 45.50 mm | 4.69 mm | 38.62 mm | 7.88 mm | 37.50 mm | 0.56 mm | 36.00 mm | Specified by purchaser | 855 lb | 42.00 mm | 28 | 1.88 mm |