Dimensions of Class 150 Full Face Gaskets (up to 24 inches) as per ASME B16.21 to Suit ASME B16.5 Flanges.
| Nominal Pipe Size (NPS) |
Inside Diameter (ID) |
Outside Diameter (OD) |
No. of Bolt Holes |
Bolt Hole Diameter (inches) |
Bolt Circle Diameter (BCD) |
|||
|---|---|---|---|---|---|---|---|---|
| inches | mm | inches | mm | inches | mm | |||
| 1/2 | 0.84 | 21 | 3.50 | 89 | 4 | 0.62 | 2.38 | 60.3 |
| 3/4 | 1.06 | 27 | 3.88 | 99 | 4 | 0.62 | 2.75 | 69.9 |
| 1 | 1.31 | 33 | 4.25 | 108 | 4 | 0.62 | 3.12 | 79.4 |
| 1 1/4 | 1.66 | 42 | 4.63 | 118 | 4 | 0.62 | 3.50 | 88.9 |
| 1 1/2 | 1.91 | 49 | 5.00 | 127 | 4 | 0.62 | 3.88 | 98.4 |
| 2 | 2.38 | 60 | 6.00 | 152 | 4 | 0.75 | 4.75 | 120.7 |
| 2 1/2 | 2.88 | 73 | 7.00 | 178 | 4 | 0.75 | 5.50 | 139.7 |
| 3 | 3.50 | 89 | 7.50 | 191 | 4 | 0.75 | 6.00 | 152.4 |
| 3 1/2 | 4.00 | 102 | 8.50 | 216 | 8 | 0.75 | 7.00 | 177.8 |
| 4 | 4.50 | 114 | 9.00 | 229 | 8 | 0.75 | 7.50 | 190.5 |
| 5 | 5.56 | 141 | 10.00 | 254 | 8 | 0.88 | 8.50 | 215.9 |
| 6 | 6.62 | 168 | 11.00 | 279 | 8 | 0.88 | 9.50 | 241.3 |
| 8 | 8.62 | 219 | 13.50 | 343 | 8 | 0.88 | 11.75 | 298.5 |
| 10 | 10.75 | 273 | 16.00 | 406 | 12 | 1.00 | 14.25 | 362.0 |
| 12 | 12.75 | 324 | 19.00 | 483 | 12 | 1.00 | 17.00 | 431.8 |
| 14 | 14.00 | 356 | 21.00 | 533 | 12 | 1.12 | 18.75 | 476.3 |
| 16 | 16.00 | 406 | 23.50 | 597 | 16 | 1.12 | 21.25 | 539.8 |
| 18 | 18.00 | 457 | 25.00 | 635 | 16 | 1.25 | 22.75 | 577.9 |
| 20 | 20.00 | 508 | 27.50 | 699 | 20 | 1.25 | 25.00 | 635.0 |
| 24 | 24.00 | 610 | 32.00 | 813 | 20 | 1.38 | 29.50 | 749.3 |