api5000API 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).Specialized API 6A Flanges Manufacturer, API 6A 6B And 6BX Flanges, American Petroleum Institute Standards. We are exporting Api 6a Flanges, API Adapter Flanges,