R51 — ASME B16.20 Ring Joint Gasket Dimensions — Type R
R51 to ASME B16.20: Pitch dia 279.40 mm; Width 22.23 mm; Oval height 28.7 mm; Octagonal height 26.9 mm; Flat width 14.81 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
R51 — 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 | 279.40 mm | 11.00 in |
| Width — A | 22.23 mm | 0.875 in |
| Oval height — B | 28.7 mm | 1.13 in |
| Octagonal height — H | 26.9 mm | 1.06 in |
| Flat width — C | 14.81 mm | 0.583 in |
| Class 2500 — NPS | 8" | 0.315 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
R51 — ASME B16.20 Ring Joint Gasket Dimensions — Type R: common questions
What are the R51 — ASME B16.20 Ring Joint Gasket Dimensions — Type R?
R51 to ASME B16.20: Pitch dia 279.40 mm; Width 22.23 mm; Oval height 28.7 mm; Octagonal height 26.9 mm; Flat width 14.81 mm.
Does Teshi Group manufacture R51 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 R51 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 R51 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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