General notes:
- Dimensions are in millimeters unless otherwise indicated.
- Images shows Grooved Gaskets with Covering Layer and Centering Ring.
- d1 = Inside diameter.
- d2 = Outside diameter.
- d3 = Outside diameter of centering ring.
- Thickness (t) specified by customer.
Dimensions of Non-Metallic Flat Gaskets ASME B16.21 to be used with Raised Face flanges ASME B16.5
Class 150 – 400
| NPS | d1 | d3 | ||
| 150 | 300 | 400 | ||
| 1/2 | 23.8 | 44.5 | 50.8 | 50.8 |
| 3/4 | 31.8 | 54 | 63.5 | 63.5 |
| 1 | 36.5 | 63.5 | 69.8 | 69.8 |
| 1¼ | 46 | 73 | 79.4 | 79.4 |
| 1½ | 52.4 | 82.6 | 92.1 | 92.1 |
| 2 | 73.2 | 101.6 | 108 | 108 |
| 2½ | 85.9 | 120.6 | 127 | 127 |
| 3 | 107.8 | 133.4 | 146.1 | 146.1 |
| 4 | 131.8 | 171.5 | 177.8 | 174.7 |
| 5 | 152.4 | 193.7 | 212.7 | 209.5 |
| 6 | 190.5 | 219.1 | 247.7 | 244.5 |
| 8 | 238.3 | 276.2 | 304.8 | 301.7 |
| 10 | 285.8 | 336.6 | 358.8 | 355.6 |
| 12 | 342.9 | 406.4 | 419.1 | 415.9 |
| 14 | 374.7 | 447.7 | 482.6 | 479.4 |
| 16 | 425.5 | 511.2 | 536.6 | 533.4 |
| 18 | 489 | 546.1 | 593.7 | 590.6 |
| 20 | 533.4 | 603.3 | 650.9 | 644.5 |
| 24 | 641.4 | 714.4 | 771.6 | 765.3 |
| NPS | d1 | 150 | 300 | 400 |
| d2 | ||||
Class 600 – 2500
| NPS | d1 | d2 | |||
| 600 | 900 | 1500 | 2500 | ||
| 1/2 | 23.8 | 50.8 | 60.4 | 60.4 | 66.8 |
| 3/4 | 31.8 | 63.5 | 66.7 | 66.7 | 73.1 |
| 1 | 36.5 | 69.9 | 76.2 | 76.2 | 82.5 |
| 1¼ | 46 | 79.4 | 85.8 | 85.8 | 101.6 |
| 1½ | 52.4 | 92.1 | 95.3 | 95.3 | 114.3 |
| 2 | 73.2 | 108 | 139.7 | 139.7 | 143 |
| 2½ | 85.9 | 127 | 161.9 | 161.9 | 165.1 |
| 3 | 107.8 | 146.1 | 165.1 | 171.5 | 193.8 |
| 4 | 131.8 | 190.5 | 203.2 | 206.5 | 231.9 |
| 5 | 152.4 | 238.2 | 244.6 | 250.9 | 276.3 |
| 6 | 190.5 | 263.6 | 285.8 | 279.4 | 314.5 |
| 8 | 238.3 | 317.5 | 355.6 | 349.3 | 384.3 |
| 10 | 285.8 | 369.9 | 431.8 | 431.8 | 473.2 |
| 12 | 342.9 | 454.1 | 495.3 | 517.6 | 546.1 |
| 14 | 374.7 | 489 | 517.6 | 574.7 | … |
| 16 | 425.5 | 562 | 571.5 | 638.2 | … |
| 18 | 489 | 609.6 | 635 | 701.8 | … |
| 20 | 533.4 | 679.5 | 695.5 | 752.5 | … |
| 24 | 641.4 | 787.4 | 835.1 | 898.6 | … |
| NPS | d1 | 600 | 900 | 1500 | 2500 |
| d2 | |||||
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