ANSI / ASME B16.47 Series A 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 | 42.75 | 5.50 | 29.50 | 11.25 | 30.50 | 0.44 | 26.00 | Specified by purchaser | 1525 | 37.50 | 20 | 2.88 |
| 28 | 46.00 | 5.62 | 31.50 | 11.75 | 32.75 | 0.50 | 28.00 | Specified by purchaser | 1810 | 40.25 | 20 | 3.12 |
| 30 | 48.50 | 5.88 | 33.75 | 12.25 | 35.00 | 0.50 | 30.00 | Specified by purchaser | 2120 | 42.75 | 20 | 3.12 |
| 32 | 51.75 | 6.25 | 36.00 | 13.00 | 37.25 | 0.50 | 32.00 | Specified by purchaser | 2545 | 45.50 | 20 | 3.38 |
| 34 | 55.00 | 6.50 | 38.00 | 13.75 | 39.62 | 0.56 | 34.00 | Specified by purchaser | 2970 | 48.25 | 20 | 3.62 |
| 36 | 57.50 | 6.75 | 40.25 | 14.25 | 41.88 | 0.56 | 36.00 | Specified by purchaser | 3395 | 50.75 | 20 | 3.62 |
| 38 | 57.50 | 7.50 | 43.25 | 13.88 | 42.25 | 0.75 | 38.00 | Specified by purchaser | 3385 | 50.75 | 20 | 3.62 |
| 40 | 59.50 | 7.75 | 45.75 | 14.31 | 44.38 | 0.81 | 40.00 | Specified by purchaser | 3620 | 52.75 | 24 | 3.62 |
| 42 | 61.50 | 8.12 | 47.75 | 14.62 | 46.31 | 0.81 | 42.00 | Specified by purchaser | 3960 | 54.75 | 24 | 3.62 |
| 44 | 64.88 | 8.44 | 50.00 | 15.38 | 48.62 | 0.88 | 44.00 | Specified by purchaser | 4300 | 57.62 | 24 | 3.88 |
| 46 | 68.25 | 8.88 | 52.50 | 16.18 | 50.88 | 0.88 | 46.00 | Specified by purchaser | 4640 | 60.50 | 24 | 4.12 |
| 48 | 70.25 | 9.19 | 54.50 | 16.50 | 52.88 | 0.94 | 48.00 | Specified by purchaser | 4980 | 62.50 | 24 | 4.12 |
*Use 25.4 as a factor to convert into mm.