ANSI B16.5 Class 900 Threaded 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 | Hub Diameter (X) | Thickness (T) | Length Thru Hub (Y) | Approximate Weight (lbs) |
|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 4.75 | 3.25 | 1.38 | 4 | 0.88 | 1.50 | 0.88 | 1.25 | 4 |
| 3/4 | 5.12 | 3.50 | 1.69 | 4 | 0.88 | 1.75 | 1.00 | 1.38 | 5 |
| 1 | 5.88 | 4.00 | 2.00 | 4 | 1.00 | 2.06 | 1.12 | 1.62 | 8 |
| 1 1/4 | 6.25 | 4.38 | 2.50 | 4 | 1.00 | 2.50 | 1.12 | 1.62 | 9 |
| 1 1/2 | 7.00 | 4.88 | 2.88 | 4 | 1.13 | 2.75 | 1.25 | 1.75 | 12 |
| 2 | 8.50 | 6.50 | 3.62 | 8 | 1.00 | 4.12 | 1.50 | 2.25 | 25 |
| 2 1/2 | 9.62 | 7.50 | 4.12 | 8 | 1.13 | 4.88 | 1.62 | 2.50 | 36 |
| 3 | 9.50 | 7.50 | 5.00 | 8 | 1.00 | 5.00 | 1.50 | 2.12 | 26 |
| 4 | 11.50 | 9.25 | 6.19 | 8 | 1.25 | 6.25 | 1.75 | 2.75 | 53 |
| 5 | 13.75 | 11.00 | 7.31 | 8 | 1.38 | 7.50 | 2.00 | 3.12 | 83 |
| 6 | 15.00 | 12.50 | 8.50 | 12 | 1.25 | 9.25 | 2.19 | 3.38 | 110 |
| 8 | 18.50 | 15.50 | 10.62 | 12 | 1.50 | 11.75 | 2.50 | 4.00 | 170 |
| 10 | 21.50 | 18.50 | 12.75 | 16 | 1.50 | 14.50 | 2.75 | 4.25 | 245 |
| 12 | 24.00 | 21.00 | 15.00 | 20 | 1.50 | 16.50 | 3.12 | 4.62 | 325 |
| 14 | 25.25 | 22.00 | 16.25 | 20 | 1.63 | 17.75 | 3.38 | 5.12 | 400 |
| 16 | 27.75 | 24.25 | 18.50 | 20 | 1.75 | 20.00 | 3.50 | 5.25 | 425 |
| 18 | 31.00 | 27.00 | 21.00 | 20 | 2.00 | 22.25 | 4.00 | 6.00 | 600 |
| 20 | 33.75 | 29.50 | 23.00 | 20 | 2.13 | 24.50 | 4.25 | 6.25 | 730 |
| 24 | 41.00 | 35.50 | 27.25 | 20 | 2.63 | 29.50 | 5.50 | 8.00 | 1400 |