api 5000Our ring joint gaskets are strictly manufactured as per API-6A and ASME B16.20 specification. RX Series are available in low carbon steel and 316 stainless steel. RX Series ring joint gasketsAPI 5K API 5K means an API-defined BOP confuration with a rated working pressure of 5,000 psi and as described in API RP 53, adopted by reference at 20 AAC 25.527(c). Source: Alaska