ASME B16.47 Class 400 Series B Welding Neck Flanges
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- All dimensions are in inches
- These flanges will be furnished with a 1/4″ raised face unless otherwise specified
(Size Chart)
| Nominal Pipe Size | Outside Diameter (O) | Bolt Circle (W) | Raised Face Diameter (R) | Number of Holes | Diameter of Holes | Bore (B) | Top of Hub (A) | Hub Diameter (X) | Minimum Fillet Radius (r) | Minimum Thickness (T) | Length Thru Hub (Y) | Approximate Weight (lbs) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 26 | 33.50 | 30.75 | 28.00 | 28 | 1.50 | Specified by purchaser | 26.00 | 27.12 | 0.44 | 3.50 | 5.88 | 360 |
| 28 | 36.00 | 33.00 | 30.00 | 24 | 1.62 | Specified by purchaser | 28.00 | 29.12 | 0.50 | 3.75 | 6.25 | 450 |
| 30 | 38.25 | 35.25 | 32.25 | 28 | 1.62 | Specified by purchaser | 30.00 | 31.25 | 0.50 | 4.00 | 6.69 | 530 |
| 32 | 40.75 | 37.50 | 34.38 | 28 | 1.75 | Specified by purchaser | 32.00 | 33.25 | 0.50 | 4.25 | 7.06 | 635 |
| 34 | 42.75 | 39.50 | 36.50 | 32 | 1.75 | Specified by purchaser | 34.00 | 35.38 | 0.56 | 4.38 | 7.38 | 690 |
| 36 | 45.50 | 42.00 | 38.62 | 28 | 1.88 | Specified by purchaser | 36.00 | 37.50 | 0.56 | 4.69 | 7.88 | 855 |
| 38 | 47.50 | 44.00 | 40.75 | 32 | 1.88 | Specified by purchaser | 38.00 | 39.50 | 0.56 | 4.88 | 8.12 | 935 |
| 40 | 50.00 | 46.25 | 43.00 | 32 | 2.00 | Specified by purchaser | 40.00 | 41.50 | 0.56 | 5.12 | 8.50 | 1090 |
| 42 | 52.00 | 48.25 | 45.00 | 32 | 2.00 | Specified by purchaser | 42.00 | 43.62 | 0.56 | 5.25 | 8.81 | 1190 |
| 44 | 54.50 | 50.50 | 47.25 | 32 | 2.12 | Specified by purchaser | 44.00 | 45.62 | 0.56 | 5.50 | 9.18 | 1375 |
| 46 | 56.75 | 52.75 | 49.50 | 36 | 2.12 | Specified by purchaser | 46.00 | 47.75 | 0.56 | 5.75 | 9.62 | 1525 |
| 48 | 59.50 | 55.25 | 51.50 | 28 | 2.38 | Specified by purchaser | 48.00 | 49.88 | 0.56 | 6.00 | 10.12 | 1790 |
| 50 | 61.75 | 57.50 | 53.62 | 32 | 2.38 | Specified by purchaser | 50.00 | 52.00 | 0.56 | 6.19 | 10.56 | 1950 |
| 52 | 63.75 | 59.50 | 55.62 | 32 | 2.38 | Specified by purchaser | 52.00 | 54.00 | 0.56 | 6.38 | 10.88 | 2125 |
| 54 | 67.00 | 62.25 | 57.88 | 28 | 2.62 | Specified by purchaser | 54.00 | 56.12 | 0.56 | 6.69 | 11.38 | 2565 |
| 56 | 69.00 | 64.25 | 60.12 | 32 | 2.62 | Specified by purchaser | 56.00 | 58.25 | 0.56 | 6.88 | 11.75 | 2710 |
| 58 | 71.00 | 66.25 | 62.12 | 32 | 2.62 | Specified by purchaser | 58.00 | 60.25 | 0.56 | 7.00 | 12.06 | 3230 |
| 60 | 74.25 | 69.00 | 64.38 | 32 | 2.88 | Specified by purchaser | 60.00 | 62.38 | 0.56 | 7.31 | 12.56 | 3820 |