ANSI B16.5 Class 1500 Threaded Flanges
| Nominal Pipe Size | Outside Diameter (O) | Thickness (T) | Raised Face Diameter (R) | Length Thru Hub (Y) | Hub Diameter (X) | Approximate Weight | Bolt Circle (C) | Number of Holes | Diameter of Holes |
|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 4.75 mm | 0.88 mm | 1.38 mm | 1.25 mm | 1.50 mm | 4 lb | 3.25 mm | 4 | 0.88 mm |
| 3/4 | 5.13 mm | 1.00 mm | 1.69 mm | 1.38 mm | 1.75 mm | 5 lb | 3.50 mm | 4 | 0.88 mm |
| 1 | 5.88 mm | 1.13 mm | 2.00 mm | 1.63 mm | 2.06 mm | 8 lb | 4.00 mm | 4 | 1.00 mm |
| 1 1/4 | 6.25 mm | 1.13 mm | 2.50 mm | 1.63 mm | 2.50 mm | 9 lb | 4.38 mm | 4 | 1.00 mm |
| 1 1/2 | 7.00 mm | 1.25 mm | 2.88 mm | 1.75 mm | 2.75 mm | 12 lb | 4.88 mm | 4 | 1.13 mm |
| 2 | 8.50 mm | 1.50 mm | 3.63 mm | 2.25 mm | 4.13 mm | 25 lb | 6.50 mm | 8 | 1.00 mm |
| 2 1/2 | 9.63 mm | 1.63 mm | 4.13 mm | 2.50 mm | 4.88 mm | 36 lb | 7.50 mm | 8 | 1.13 mm |
| 3 | 10.50 mm | 1.88 mm | 5.00 mm | 2.88 mm | 5.25 mm | 48 lb | 8.00 mm | 8 | 1.25 mm |
| 4 | 12.25 mm | 2.13 mm | 6.19 mm | 3.56 mm | 6.38 mm | 73 lb | 9.50 mm | 8 | 1.38 mm |
| 5 | 14.75 mm | 2.88 mm | 7.31 mm | 4.13 mm | 7.75 mm | 130 lb | 11.50 mm | 8 | 1.63 mm |
| 6 | 15.50 mm | 3.25 mm | 8.50 mm | 4.69 mm | 9.00 mm | 165 lb | 12.50 mm | 12 | 1.50 mm |
| 8 | 19.00 mm | 3.63 mm | 10.63 mm | 5.63 mm | 11.50 mm | 260 lb | 15.50 mm | 12 | 1.75 mm |
| 10 | 23.00 mm | 4.25 mm | 12.75 mm | 6.25 mm | 14.50 mm | 435 lb | 19.00 mm | 12 | 2.00 mm |
| 12 | 26.50 mm | 4.88 mm | 15.00 mm | 7.13 mm | 17.75 mm | 580 lb | 22.50 mm | 16 | 2.13 mm |