Gasket - Spiral Wound, for ANSI Class 300, B16.5 (in)
- Dimensions to ASME B16.20 - Metallic Gaskets for Pipe Flanges: Ring-Joint, Spiral-Wound, and Jacketed
- Inner rings are recommended for all graphite filled gaskets, required for all PTFE filled gaskets.
- The gasket outside diameter tolerance for NPS 1/2" through NPS 8" is ±0.03"; for NPS 10" through NPS 24", +0.06", –0.03".
- The gasket inside diameter tolerance for NPS 1/2" through NPS 8" is ±0.016"; for NPS 10" through NPS 24", ±0.03".
- The centering ring outside diameter tolerance is ±0.03".
- ASME B16.20 does not include gaskets with no internal ring dimensions for NPS 1/4" or 3 1/2".
| Pipe
Size (NPS) | Inner
Ring Inside Diameter A | Sealing
Element Inside Diameter B | Sealing
Element Outside Diameter C | Outer
Ring Outside Diameter D |
|---|---|---|---|---|
| 1/2 | 0.56 | 0.75 | 1.25 | 2.13 |
| 3/4 | 0.81 | 1.00 | 1.56 | 2.63 |
| 1 | 1.06 | 1.25 | 1.88 | 2.88 |
| 1 1/4 | 1.50 | 1.88 | 2.38 | 3.25 |
| 1 1/2 | 1.75 | 2.13 | 2.75 | 3.75 |
| 2 | 2.19 | 2.75 | 3.38 | 4.38 |
| 2 1/2 | 2.62 | 3.25 | 3.88 | 5.13 |
| 3 | 3.19 | 4.00 | 4.75 | 5.88 |
| 3 1/2 | — | 4.50 | 5.25 | 6.50 |
| 4 | 4.19 | 5.00 | 5.88 | 7.13 |
| 5 | 5.19 | 6.13 | 7.00 | 8.50 |
| 6 | 6.19 | 7.19 | 8.25 | 9.88 |
| 8 | 8.50 | 9.19 | 10.38 | 12.13 |
| 10 | 10.56 | 11.31 | 12.50 | 14.25 |
| 12 | 2.50 | 13.38 | 14.75 | 16.63 |
| 14 | 13.75 | 14.63 | 16.00 | 19.13 |
| 16 | 15.75 | 16.63 | 18.25 | 21.25 |
| 18 | 17.69 | 18.69 | 20.75 | 23.50 |
| 20 | 19.69 | 20.69 | 22.75 | 25.75 |
| 24 | 23.75 | 24.75 | 27.00 | 30.50 |