Dimension of Nonmetallic Full Face Gaskets, Class 400, ASME B16.21
used with RF flanges ASME B16.5
OTHER PRESSURE CLASSES
400
| NPS | Inside Dia. (ID) |
Outside Dia. (OD) |
No.of Bolt Holes |
Bolt Hole Dia. |
Bolt Circle Dia. (BCD) |
| 1/2 | 21 | 95 | 4 | 16 | 66.5 |
| 3/4 | 27 | 117 | 4 | 19 | 82.6 |
| 1 | 33 | 124 | 4 | 19 | 88.9 |
| 1.1/4 | 42 | 133 | 4 | 19 | 98.4 |
| 1.1/2 | 49 | 156 | 4 | 22 | 114.3 |
| 2 | 60 | 165 | 8 | 19 | 127.0 |
| 2.1/2 | 73 | 191 | 8 | 22 | 149.2 |
| 3 | 89 | 210 | 8 | 22 | 168.3 |
| 3.1/2 | 102 | 229 | 8 | 25 | 184.2 |
| 4 | 114 | 254 | 8 | 25 | 200.0 |
| 5 | 141 | 279 | 8 | 25 | 235.0 |
| 6 | 168 | 318 | 12 | 25 | 269.9 |
| 8 | 219 | 381 | 12 | 28 | 330.2 |
| 10 | 273 | 445 | 16 | 31 | 387.4 |
| 12 | 324 | 521 | 16 | 35 | 450.9 |
| 14 | 356 | 584 | 20 | 35 | 514.4 |
| 16 | 406 | 648 | 20 | 38 | 571.5 |
| 18 | 457 | 711 | 24 | 38 | 628.7 |
| 20 | 508 | 775 | 24 | 41 | 685.8 |
| 24 | 610 | 914 | 24 | 47 | 812.8 |
General notes..
- Dimensions are in millimeters unless otherwise indicated.
- Never use full face gaskets on flanges with a raised face, or other faces. Flanges for full face gaskets should only be used on completely smooth faces.
