Ring Joint Seal Gasket 1.Type:R,BX,RX2,Size:R11-105,RX20- ... ''-inch24'' 3.Standard:API,ASME B16.20 4.All materials Ring Joint Seal Gasket1.Type: R,BX,RX2 Shape: octagonal, oval, lens3 ... hardness(HB)max temperature(degrees)soft iron90450carbon steel120450F51150540304160600316160600 API 6A Seal Ring Joint Gasket