ANSI / ASME B16.5 Class 900 Weld Neck Flange Dimensions
| Nominal Pipe Size | Outside Diameter (O) | Thickness (T) | Raised Face Diameter (R) | Length Thru Hub (Y) | Hub Diameter (X) | Bore (B1) | Bore (B2) | Depth of Socket (D) | Approximate Weight (lbs) | Bolt Circle (C) | Number of Holes | Diameter of Holes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 4.75 | 0.88 | 1.38 | 1.25 | 1.50 | Specified by purchaser | 0.88 | 0.38 | 5 | 3.25 | 4 | 0.88 |
| 3/4 | 5.13 | 1.00 | 1.69 | 1.38 | 1.75 | Specified by purchaser | 1.09 | 0.44 | 6 | 3.50 | 4 | 0.88 |
| 1 | 5.88 | 1.13 | 2.00 | 1.63 | 2.06 | Specified by purchaser | 1.36 | 0.50 | 9 | 4.00 | 4 | 1.00 |
| 1 1/4 | 6.25 | 1.13 | 2.50 | 1.63 | 2.50 | Specified by purchaser | 1.70 | 0.56 | 10 | 4.38 | 4 | 1.00 |
| 1 1/2 | 7.00 | 1.25 | 2.88 | 1.75 | 2.75 | Specified by purchaser | 1.95 | 0.63 | 13 | 4.88 | 4 | 1.13 |
| 2 | 8.50 | 1.50 | 3.63 | 2.25 | 4.13 | Specified by purchaser | 2.44 | 0.69 | 25 | 6.50 | 8 | 1.00 |
| 2 1/2 | 9.63 | 1.63 | 4.13 | 2.50 | 4.88 | Specified by purchaser | 2.94 | 0.75 | 36 | 7.50 | 8 | 1.13 |
*Use 25.4 as a factor to convert into mm.