R31 — ASME B16.20 Ring Joint Gasket Dimensions — Type R
R31 to ASME B16.20: Pitch dia 123.83 mm; Width 11.13 mm; Oval height 17.5 mm; Octagonal height 16.0 mm; Flat width 7.75 mm.
Key to dimensions
- P
- Pitch diameter of ring
- A
- Width of ring
- B
- Height of oval ring
- H
- Height of octagonal ring
- C
- Width of flat on octagonal ring
R31 — ASME B16.20 Ring Joint Gasket Dimensions — Type R — all dimensions
Type R ring joint gaskets (mm) and flange size by class
| Dimension | Value | Equivalent |
|---|---|---|
| Pitch dia — P | 123.83 mm | 4.88 in |
| Width — A | 11.13 mm | 0.438 in |
| Oval height — B | 17.5 mm | 0.689 in |
| Octagonal height — H | 16.0 mm | 0.630 in |
| Flat width — C | 7.75 mm | 0.305 in |
| Class 300–600 — NPS | 3" | 0.118 in |
| Class 900 — NPS | 3" | 0.118 in |
Values are nominal, from ASME B16.20 Ring Joint Gasket Dimensions — Type R. Verify critical dimensions against the current edition of the standard before design, purchase or fabrication.
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FAQ
R31 — ASME B16.20 Ring Joint Gasket Dimensions — Type R: common questions
What are the R31 — ASME B16.20 Ring Joint Gasket Dimensions — Type R?
R31 to ASME B16.20: Pitch dia 123.83 mm; Width 11.13 mm; Oval height 17.5 mm; Octagonal height 16.0 mm; Flat width 7.75 mm.
Does Teshi Group manufacture R31 gaskets?
Yes. Teshi Group is an OEM manufacturer in India of gaskets to ASME B16.20, in carbon, alloy, stainless, duplex, super duplex, nickel alloys, titanium and Cu-Ni, with EN 10204 3.1 certificates.
Can I download the R31 dimensions as a PDF?
Yes. Use “Download PDF for this size” on this page to get a single-size, print-ready PDF with the drawing and every tabulated dimension, or download the full ASME B16.20 Ring Joint Gasket Dimensions — Type R chart.
Need R31 gaskets?
Teshi Group manufactures them in India — send your size, rating and material and get a quote in 24–48 hours.
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