ANSI B16.5 Class 900 Lap Joint Flanges
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- All dimensions are in inches
(Size Chart)
| Nominal Pipe Size | Outside Diameter (O) | Bolt Circle (W) | Radius (r) | Number of Holes | Diameter of Holes | Hub Diameter (X) | Bore (B) | Thickness (T) | Length Thru Hub (Y) | Approximate Weight (lbs) |
|---|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 4.75 | 3.25 | 0.12 | 4 | 0.88 | 1.50 | 0.90 | 0.88 | 1.25 | 4 |
| 3/4 | 5.12 | 3.50 | 0.12 | 4 | 0.88 | 1.75 | 1.11 | 1.00 | 1.38 | 5 |
| 1 | 5.88 | 4.00 | 0.12 | 4 | 1.00 | 2.06 | 1.38 | 1.12 | 1.62 | 8 |
| 1 1/4 | 6.25 | 4.38 | 0.19 | 4 | 1.00 | 2.50 | 1.72 | 1.12 | 1.62 | 9 |
| 1 1/2 | 7.00 | 4.88 | 0.25 | 4 | 1.13 | 2.75 | 1.97 | 1.25 | 1.75 | 12 |
| 2 | 8.50 | 6.50 | 0.31 | 8 | 1.00 | 4.12 | 2.46 | 1.50 | 2.25 | 25 |
| 2 1/2 | 9.62 | 7.50 | 0.31 | 8 | 1.13 | 4.88 | 2.97 | 1.62 | 2.50 | 35 |
| 3 | 9.50 | 7.50 | 0.38 | 8 | 1.00 | 5.00 | 3.60 | 1.50 | 2.12 | 25 |
| 4 | 11.50 | 9.25 | 0.44 | 8 | 1.25 | 6.25 | 4.60 | 1.75 | 2.75 | 51 |
| 5 | 13.75 | 11.00 | 0.50 | 8 | 1.38 | 7.50 | 5.69 | 2.00 | 3.12 | 81 |
| 6 | 15.00 | 12.50 | 0.50 | 12 | 1.25 | 9.25 | 6.75 | 2.19 | 3.38 | 105 |
| 8 | 18.50 | 15.50 | 0.50 | 12 | 1.50 | 11.75 | 8.75 | 2.50 | 4.50 | 190 |
| 10 | 21.50 | 18.50 | 0.50 | 16 | 1.50 | 14.50 | 10.92 | 2.75 | 5.00 | 275 |
| 12 | 24.00 | 21.00 | 0.50 | 20 | 1.50 | 16.50 | 12.92 | 3.12 | 5.62 | 370 |
| 14 | 25.25 | 22.00 | 0.50 | 20 | 1.63 | 17.75 | 14.18 | 3.38 | 6.12 | 415 |
| 16 | 27.75 | 24.25 | 0.50 | 20 | 1.75 | 20.00 | 16.19 | 3.50 | 6.50 | 465 |
| 18 | 31.00 | 27.00 | 0.50 | 20 | 2.00 | 22.25 | 18.20 | 4.00 | 7.50 | 650 |
| 20 | 33.75 | 29.50 | 0.50 | 20 | 2.13 | 24.50 | 20.25 | 4.25 | 8.25 | 810 |
| 24 | 41.00 | 35.50 | 0.50 | 20 | 2.63 | 29.50 | 24.25 | 5.50 | 10.50 | 1550 |