... .0-PN42.0 Ring joint,RX gaskets high pressure1.Type: R,BX,RX,IX2 Shape: octagonal, oval, lens3.Size:R11-105 ... B16.20 HG20612 HG206337.Material: carbon steel, soft iron, inconel600, M-400, C-276, 10#,ss316,ss304.8.Application: W/N ... hardness(HB)max temperature(degrees)soft iron90450carbon steel120450F51150540304160600316160600 API 6A R RX BX all series gaskets