ASME B16.47 Class 300 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) | Bolt Circle (C) | Number of Holes | Diameter of Holes | Approximate Weight |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 26 | 34.12 mm | 3.50 mm | 29.00 mm | 5.69 mm | 27.62 mm | 0.56 mm | 26.19 mm | Specified by purchaser | 31.62 mm | 32 | 1.38 mm | 400 lb |
| 28 | 36.25 mm | 3.50 mm | 31.00 mm | 5.88 mm | 29.75 mm | 0.56 mm | 28.19 mm | Specified by purchaser | 33.75 mm | 36 | 1.38 mm | 450 lb |
| 30 | 39.00 mm | 3.69 mm | 33.25 mm | 6.22 mm | 32.00 mm | 0.56 mm | 30.25 mm | Specified by purchaser | 36.25 mm | 36 | 1.50 mm | 550 lb |
| 32 | 41.50 mm | 4.06 mm | 35.50 mm | 6.62 mm | 34.00 mm | 0.62 mm | 32.25 mm | Specified by purchaser | 38.50 mm | 32 | 1.62 mm | 685 lb |
| 34 | 43.62 mm | 4.06 mm | 37.50 mm | 6.81 mm | 36.12 mm | 0.62 mm | 34.25 mm | Specified by purchaser | 40.62 mm | 36 | 1.62 mm | 750 lb |
| 36 | 46.12 mm | 4.06 mm | 39.75 mm | 7.12 mm | 38.00 mm | 0.62 mm | 36.25 mm | Specified by purchaser | 42.88 mm | 32 | 1.75 mm | 840 lb |
| 38 | 48.12 mm | 4.38 mm | 41.75 mm | 7.56 mm | 40.00 mm | 0.62 mm | 38.25 mm | Specified by purchaser | 44.88 mm | 36 | 1.75 mm | 915 lb |
| 40 | 50.12 mm | 4.56 mm | 43.88 mm | 7.81 mm | 42.00 mm | 0.62 mm | 40.25 mm | Specified by purchaser | 46.88 mm | 40 | 1.75 mm | 990 lb |
| 42 | 52.50 mm | 4.69 mm | 46.00 mm | 8.06 mm | 44.00 mm | 0.62 mm | 42.31 mm | Specified by purchaser | 49.00 mm | 36 | 1.88 mm | 1135 lb |
| 44 | 54.50 mm | 5.00 mm | 48.00 mm | 8.44 mm | 46.19 mm | 0.62 mm | 44.31 mm | Specified by purchaser | 51.00 mm | 40 | 1.88 mm | 1235 lb |
| 46 | 57.50 mm | 5.06 mm | 50.00 mm | 8.75 mm | 48.38 mm | 0.62 mm | 46.31 mm | Specified by purchaser | 53.75 mm | 36 | 2.00 mm | 1470 lb |
| 48 | 59.50 mm | 5.06 mm | 52.25 mm | 8.81 mm | 50.31 mm | 0.62 mm | 48.31 mm | Specified by purchaser | 55.75 mm | 40 | 2.00 mm | 1575 lb |
| 50 | 61.50 mm | 5.44 mm | 54.25 mm | 9.25 mm | 52.38 mm | 0.62 mm | 50.31 mm | Specified by purchaser | 57.75 mm | 44 | 2.00 mm | 1710 lb |
| 52 | 63.50 mm | 5.62 mm | 56.25 mm | 9.56 mm | 54.44 mm | 0.62 mm | 52.31 mm | Specified by purchaser | 59.75 mm | 48 | 2.00 mm | 1840 lb |
| 54 | 65.88 mm | 5.38 mm | 58.25 mm | 9.44 mm | 56.50 mm | 0.62 mm | 54.31 mm | Specified by purchaser | 62.12 mm | 48 | 2.00 mm | 1980 lb |
| 56 | 69.50 mm | 6.06 mm | 60.50 mm | 10.56 mm | 58.81 mm | 0.69 mm | 56.31 mm | Specified by purchaser | 65.00 mm | 36 | 2.38 mm | 2595 lb |
| 58 | 71.94 mm | 6.06 mm | 62.75 mm | 10.81 mm | 60.94 mm | 0.69 mm | 58.31 mm | Specified by purchaser | 67.44 mm | 40 | 2.38 mm | 2770 lb |
| 60 | 73.94 mm | 5.94 mm | 65.00 mm | 10.69 mm | 62.94 mm | 0.69 mm | 60.31 mm | Specified by purchaser | 69.44 mm | 40 | 2.38 mm | 2870 lb |