Gasket - Spiral Wound, for ANSI Class 400, 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".
- (*) There are no internal ring gaskets for Class 400 flanges in NPS 1/2" through NPS 3" (use Class 600).
- 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 (*) | — | 0.75 | 1.25 | 2.13 |
3/4 (*) | — | 1.00 | 1.56 | 2.63 |
1 (*) | — | 1.25 | 1.88 | 2.88 |
1 1/4 (*) | — | 1.88 | 2.38 | 3.25 |
1 1/2 (*) | — | 2.13 | 2.75 | 3.75 |
2 (*) | — | 2.75 | 3.38 | 4.38 |
2 1/2 (*) | — | 3.25 | 3.88 | 5.13 |
3 (*) | — | 4.00 | 4.75 | 5.88 |
3 1/2 | — | 4.13 | 5.25 | 6.38 |
4 | 4.04 | 4.75 | 5.88 | 7.00 |
5 | 5.05 | 5.81 | 7.00 | 8.38 |
6 | 6.10 | 6.88 | 8.25 | 9.75 |
8 | 8.10 | 8.88 | 10.38 | 12.00 |
10 | 10.05 | 10.81 | 12.50 | 14.13 |
12 | 12.10 | 12.88 | 14.75 | 16.50 |
14 | 13.50 | 14.25 | 16.00 | 19.00 |
16 | 15.35 | 16.25 | 18.25 | 21.13 |
18 | 17.25 | 18.50 | 20.75 | 23.38 |
20 | 19.25 | 20.50 | 22.75 | 25.50 |
24 | 23.25 | 24.75 | 27.00 | 30.25 |