Dimensions of Class 900 Flat Ring Gaskets (up to 24 inches) as per ASME B16.21 to Suit ASME B16.5 Flanges.
| CLASS 900 | ||||
|---|---|---|---|---|
| Nominal Pipe Size (NPS) |
Inside Diameter (ID) |
Outside Diameter (OD) |
||
| inches | mm | inches | mm | |
| 1/2 | 0.84 | 21 | 2.50 | 64 |
| 3/4 | 1.06 | 27 | 2.75 | 70 |
| 1 | 1.31 | 33 | 3.12 | 79 |
| 1 1/4 | 1.66 | 42 | 3.50 | 89 |
| 1 1/2 | 1.91 | 49 | 3.88 | 99 |
| 2 | 2.38 | 60 | 5.62 | 143 |
| 2 1/2 | 2.88 | 73 | 6.50 | 165 |
| 3 | 3.50 | 89 | 6.62 | 168 |
| 3 1/2 | - | - | - | - |
| 4 | 4.50 | 114 | 8.12 | 206 |
| 5 | 5.56 | 141 | 9.75 | 248 |
| 6 | 6.62 | 168 | 11.38 | 289 |
| 8 | 8.62 | 219 | 14.12 | 359 |
| 10 | 10.75 | 273 | 17.12 | 435 |
| 12 | 12.75 | 324 | 19.62 | 498 |
| 14 | 14.00 | 356 | 20.50 | 521 |
| 16 | 16.00 | 406 | 22.62 | 575 |
| 18 | 18.00 | 457 | 25.12 | 638 |
| 20 | 20.00 | 508 | 27.50 | 699 |
| 24 | 24.00 | 610 | 33.00 | 838 |