Dimensions of Non-Metallic Flat Gaskets ASME B16.21
to be used with RF flanges ASME B16.5
NPS 1/2-24
| NPS | d1 | d2 | ||||
| Class 150 |
Class 300 |
Class 400 |
Class 600 |
Class 900 |
||
| 1/2 | 21 | 48 | 54 | 54 | 54 | 64 |
| 3/4 | 27 | 57 | 67 | 67 | 67 | 70 |
| 1 | 33 | 67 | 73 | 73 | 73 | 79 |
| 1.1/4 | 42 | 76 | 83 | 83 | 83 | 89 |
| 1.1/2 | 48 | 86 | 95 | 95 | 95 | 98 |
| 2 | 60 | 105 | 111 | 111 | 111 | 143 |
| 2.1/2 | 73 | 124 | 130 | 130 | 130.2 | 165 |
| 3 | 89 | 137 | 149 | 149 | 149 | 168 |
| 3.1/2 | 102 | 162 | 165 | 162 | 162 | |
| 4 | 114 | 175 | 181 | 178 | 194 | 206 |
| 5 | 141 | 197 | 216 | 213 | 241 | 248 |
| 6 | 168 | 222 | 251 | 248 | 267 | 289 |
| 8 | 219 | 279 | 308 | 305 | 321 | 359 |
| 10 | 273 | 340 | 362 | 359 | 400 | 435 |
| 12 | 324 | 410 | 422 | 419 | 457 | 498 |
| 14 | 356 | 451 | 486 | 483 | 492 | 521 |
| 16 | 406 | 514 | 540 | 537 | 565 | 575 |
| 18 | 457 | 549 | 597 | 594 | 613 | 638 |
| 20 | 508 | 606 | 654 | 648 | 683 | 699 |
| 24 | 610 | 718 | 775 | 768 | 791 | 838 |
General notes..
- Dimensions are in millimeters unless otherwise indicated.
- d1 = Inside diameter.
- d2 = Outside diameter.
- Dimensional tolerances outside diameter NPS 12 and smaller.. +0 / -1.5 mm.
- Dimensional tolerances outside diameter NPS 14 and larger.. +0 / -3.0 mm.
- Dimensional tolerances inside diameter NPS 12 and smaller.. ± 1.5 mm.
- Dimensional tolerances inside diameter NPS 14 and larger.. ± 3.0 mm.
- Thickness (t) specified by customer.