ANSI B16.5 Class 400 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 | 3.75 | 2.62 | 0.12 | 4 | 0.63 | 1.50 | 0.90 | 0.56 | 0.88 | 2 |
| 3/4 | 4.62 | 3.25 | 0.12 | 4 | 0.75 | 1.88 | 1.11 | 0.62 | 1.00 | 3 |
| 1 | 4.88 | 3.50 | 0.12 | 4 | 0.75 | 2.12 | 1.38 | 0.69 | 1.06 | 4 |
| 1 1/4 | 5.25 | 3.88 | 0.19 | 4 | 0.75 | 2.50 | 1.72 | 0.81 | 1.12 | 5 |
| 1 1/2 | 6.12 | 4.50 | 0.25 | 4 | 0.88 | 2.75 | 1.97 | 0.88 | 1.25 | 7 |
| 2 | 6.50 | 5.00 | 0.31 | 8 | 0.75 | 3.31 | 2.46 | 1.00 | 1.44 | 9 |
| 2 1/2 | 7.50 | 5.88 | 0.31 | 8 | 0.88 | 3.94 | 2.97 | 1.12 | 1.62 | 12 |
| 3 | 8.25 | 6.62 | 0.38 | 8 | 0.88 | 4.62 | 3.60 | 1.25 | 1.81 | 15 |
| 3 1/2 | 9.00 | 7.25 | 0.38 | 8 | 1.00 | 5.25 | 4.10 | 1.38 | 1.94 | 20 |
| 4 | 10.00 | 7.88 | 0.44 | 8 | 1.00 | 5.75 | 4.60 | 1.38 | 2.00 | 25 |
| 5 | 11.00 | 9.25 | 0.44 | 8 | 1.00 | 7.00 | 5.69 | 1.50 | 2.12 | 29 |
| 6 | 12.50 | 10.62 | 0.50 | 12 | 1.00 | 8.12 | 6.75 | 1.62 | 2.25 | 42 |
| 8 | 15.00 | 13.00 | 0.50 | 12 | 1.13 | 10.25 | 8.75 | 1.88 | 2.69 | 64 |
| 10 | 17.50 | 15.25 | 0.50 | 16 | 1.25 | 12.62 | 10.92 | 2.12 | 4.00 | 110 |
| 12 | 20.50 | 17.75 | 0.50 | 16 | 1.38 | 14.75 | 12.92 | 2.25 | 4.25 | 150 |
| 14 | 23.00 | 20.25 | 0.50 | 20 | 1.38 | 16.75 | 14.18 | 2.38 | 4.62 | 205 |
| 16 | 25.50 | 22.50 | 0.50 | 20 | 1.50 | 19.00 | 16.19 | 2.50 | 5.00 | 260 |
| 18 | 28.00 | 24.75 | 0.50 | 24 | 1.50 | 21.00 | 18.20 | 2.62 | 5.38 | 315 |
| 20 | 30.50 | 27.00 | 0.50 | 24 | 1.63 | 23.13 | 20.25 | 2.75 | 5.75 | 385 |
| 22 | 33.00 | 29.25 | 0.50 | 24 | 1.75 | 25.25 | 22.25 | 2.88 | 6.00 | 455 |
| 24 | 36.00 | 32.00 | 0.50 | 24 | 1.88 | 27.62 | 24.25 | 3.00 | 6.25 | 570 |