... .0-PN42.0 Ring joint,RX gaskets high pressure1.Type: R,BX,RX,IX2 Shape: octagonal, oval, lens3.Size:R11-105 ... ,RX20-215 BX150-303, inch 1/2-inch244.Certificate:API 6A, ISO9001:20005.Pressure ... hardness(HB)max temperature(degrees)soft iron90450carbon steel120450F51150540304160600316160600 API 6A R RX BX all series gaskets