Style R ring joint gaskets are manufactured in accordance with both API 6A and ASME B16.20 size/ratings. The R-Type ring gasket can be ordered to two different profiles, oval or octagonal in cross-sections. Both types have identical pitch diameter as the flange groove they correspond to. These gaskets are used in pressures up to 5,000 PSI. The octagonal type has a higher sealing coefficient than the oval, therefore being the better gasket of the two. The oval type is the only gasket that will fit a bottom radius groove. Flanges with flat bottom vgrooves will accept either style. Gaskets that have been torqued initiating a metal-to-metal seal should be discarded and not reused. These Gaskets are used in Pressures up to 5,000 PSI in API 6A Flanges, And up to 2,500 PSI in ASME/ANSI B16.5 Flanges.