ANSI / ASME B16.47 Series A Class 300 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 | 38.25 | 3.12 | 29.50 | 7.25 | 28.38 | 0.38 | 26.00 | Specified by purchaser | 605 | 34.50 | 28 | 1.75 |
| 28 | 40.75 | 3.38 | 31.50 | 7.75 | 30.50 | 0.44 | 28.00 | Specified by purchaser | 745 | 37.00 | 28 | 1.75 |
| 30 | 43.00 | 3.62 | 33.75 | 8.25 | 32.56 | 0.44 | 30.00 | Specified by purchaser | 870 | 39.25 | 28 | 1.88 |
| 32 | 45.25 | 3.88 | 36.00 | 8.75 | 34.69 | 0.44 | 32.00 | Specified by purchaser | 1005 | 41.50 | 28 | 2.00 |
| 34 | 47.50 | 4.00 | 38.00 | 9.12 | 36.88 | 0.50 | 34.00 | Specified by purchaser | 1145 | 43.50 | 28 | 2.00 |
| 36 | 50.00 | 4.12 | 40.25 | 9.50 | 39.00 | 0.50 | 36.00 | Specified by purchaser | 1275 | 46.00 | 32 | 2.12 |
| 38 | 46.00 | 4.25 | 40.50 | 7.12 | 39.12 | 0.50 | 38.00 | Specified by purchaser | 695 | 43.00 | 32 | 1.62 |
| 40 | 48.75 | 4.50 | 42.75 | 7.62 | 41.25 | 0.50 | 40.00 | Specified by purchaser | 840 | 45.50 | 32 | 1.75 |
| 42 | 50.75 | 4.69 | 44.75 | 7.88 | 43.25 | 0.50 | 42.00 | Specified by purchaser | 950 | 47.50 | 32 | 1.75 |
| 44 | 53.25 | 4.88 | 47.00 | 8.12 | 45.25 | 0.50 | 44.00 | Specified by purchaser | 1055 | 49.75 | 32 | 1.88 |
| 46 | 55.75 | 5.06 | 49.00 | 8.50 | 47.38 | 0.50 | 46.00 | Specified by purchaser | 1235 | 52.00 | 28 | 2.00 |
| 48 | 57.75 | 5.25 | 51.25 | 8.81 | 49.38 | 0.50 | 48.00 | Specified by purchaser | 1380 | 54.00 | 32 | 2.00 |
| 50 | 60.25 | 5.50 | 53.50 | 9.12 | 51.38 | 0.50 | 50.00 | Specified by purchaser | 1530 | 56.25 | 32 | 2.12 |
| 52 | 62.25 | 5.69 | 55.50 | 9.38 | 53.38 | 0.50 | 52.00 | Specified by purchaser | 1660 | 58.25 | 32 | 2.12 |
| 54 | 65.25 | 6.00 | 57.75 | 9.94 | 55.50 | 0.50 | 54.00 | Specified by purchaser | 2050 | 61.00 | 28 | 2.38 |
| 56 | 67.25 | 6.06 | 59.75 | 10.25 | 57.62 | 0.50 | 56.00 | Specified by purchaser | 2155 | 63.00 | 28 | 2.38 |
| 58 | 69.25 | 6.25 | 62.00 | 10.50 | 59.62 | 0.50 | 58.00 | Specified by purchaser | 2270 | 65.00 | 32 | 2.38 |
| 60 | 71.25 | 6.44 | 64.00 | 10.75 | 61.62 | 0.50 | 60.00 | Specified by purchaser | 2470 | 67.00 | 32 | 2.38 |
*Use 25.4 as a factor to convert into mm.