ANSI B16.5 Class 300 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 | 3 |
| 1 1/4 | 5.25 | 3.88 | 0.19 | 4 | 0.75 | 2.50 | 1.72 | 0.75 | 1.06 | 4 |
| 1 1/2 | 6.12 | 4.50 | 0.25 | 4 | 0.88 | 2.75 | 1.97 | 0.81 | 1.19 | 6 |
| 2 | 6.50 | 5.00 | 0.31 | 8 | 0.75 | 3.31 | 2.46 | 0.88 | 1.31 | 7 |
| 2 1/2 | 7.50 | 5.88 | 0.31 | 8 | 0.88 | 3.94 | 2.97 | 1.00 | 1.50 | 10 |
| 3 | 8.25 | 6.62 | 0.38 | 8 | 0.88 | 4.62 | 3.60 | 1.12 | 1.69 | 13 |
| 3 1/2 | 9.00 | 7.25 | 0.38 | 8 | 0.88 | 5.25 | 4.10 | 1.19 | 1.75 | 17 |
| 4 | 10.00 | 7.88 | 0.44 | 8 | 0.88 | 5.75 | 4.60 | 1.25 | 1.88 | 22 |
| 5 | 11.00 | 9.25 | 0.44 | 8 | 0.88 | 7.00 | 5.69 | 1.38 | 2.00 | 28 |
| 6 | 12.50 | 10.62 | 0.50 | 12 | 0.88 | 8.12 | 6.75 | 1.44 | 2.06 | 39 |
| 8 | 15.00 | 13.00 | 0.50 | 12 | 1.00 | 10.25 | 8.75 | 1.62 | 2.44 | 58 |
| 10 | 17.50 | 15.25 | 0.50 | 16 | 1.13 | 12.62 | 10.92 | 1.88 | 3.75 | 91 |
| 12 | 20.50 | 17.75 | 0.50 | 16 | 1.25 | 14.75 | 12.92 | 2.00 | 4.00 | 140 |
| 14 | 23.00 | 20.25 | 0.50 | 20 | 1.25 | 16.75 | 14.18 | 2.12 | 4.38 | 190 |
| 16 | 25.50 | 22.50 | 0.50 | 20 | 1.38 | 19.00 | 16.19 | 2.25 | 4.75 | 250 |
| 18 | 28.00 | 24.75 | 0.50 | 24 | 1.38 | 21.00 | 18.20 | 2.38 | 5.12 | 295 |
| 20 | 30.50 | 27.00 | 0.50 | 24 | 1.38 | 23.12 | 20.25 | 2.50 | 5.50 | 370 |
| 22 | 33.00 | 29.25 | 0.50 | 24 | 1.63 | 25.25 | 22.25 | 2.62 | 5.69 | 435 |
| 24 | 36.00 | 32.00 | 0.50 | 24 | 1.63 | 27.62 | 24.25 | 2.75 | 6.00 | 550 |