- Dimensions per ASME B16.47 - Large Diameter Steel Flanges: NPS 26 Through NPS 60 Metric/Inch Standard
- Bolt circle diameters are 1/8 inch larger than bolt diameter.
| Pipe Size
(NPS) | Outside Diameter of Flange
A | Diameter of Raised Face
B | Thickness of Flange
C | Number of Bolt Holes
| Diameter of Bolt Holes
| Bolt Circle Diameter
P | Approx Weight
(lb) |
|---|---|---|---|---|---|---|---|
| 26 | 30 | 27 3/4 | 1 5/16 | 36 | 3/4 | 28 1/2 | 255 |
| 28 | 32 | 29 3/4 | 1 5/16 | 40 | 3/4 | 30 1/2 | 290 |
| 30 | 34 | 31 3/4 | 1 5/16 | 44 | 3/4 | 32 1/2 | 330 |
| 32 | 36 | 33 3/4 | 1 7/16 | 48 | 3/4 | 34 1/2 | 390 |
| 34 | 38 | 35 3/4 | 1 1/2 | 52 | 3/4 | 36 1/2 | 430 |
| 36 | 40 11/16 | 38 | 1 11/16 | 40 | 7/8 | 39 1/16 | 520 |
| 38 | 42 11/16 | 40 | 1 3/4 | 40 | 7/8 | 41 1/16 | 595 |
| 40 | 44 11/16 | 42 | 1 3/4 | 44 | 7/8 | 43 1/16 | 760 |
| 42 | 46 11/16 | 44 | 1 7/8 | 48 | 7/8 | 45 1/16 | 895 |
| 44 | 49 1/4 | 46 1/4 | 1 15/16 | 36 | 1 | 47 3/8 | 1065 |
| 46 | 51 1/4 | 48 1/4 | 2 | 40 | 1 | 49 3/8 | 1185 |
| 48 | 53 1/4 | 50 1/4 | 2 1/8 | 44 | 1 | 51 3/8 | 1315 |
| 50 | 55 1/4 | 52 1/4 | 2 3/16 | 44 | 1 | 53 3/8 | 1505 |
| 52 | 57 3/8 | 54 1/4 | 2 1/4 | 48 | 1 | 55 1/2 | 1665 |
| 54 | 59 3/8 | 56 1/4 | 2 3/8 | 48 | 1 | 57 1/2 | 1840 |
| 56 | 62 | 58 1/2 | 2 7/16 | 40 | 1 1/8 | 59 7/8 | 2110 |
| 58 | 64 | 60 1/2 | 2 1/2 | 44 | 1 1/8 | 61 7/8 | 2300 |
| 60 | 66 | 62 1/2 | 2 5/8 | 44 | 1 1/8 | 63 7/8 | 2500 |