API 6B and 6BX flanges are a type of flange designed for use in high-pressure and high-temperature applications in the oil and gas industry. The API 6B and 6BX standards are set by the American Petroleum Institute (API).

API 6B flanges are a type of flange with a raised face that is commonly used for lower pressure applications. They are available in sizes from 1 13/16″ to 30″ and are rated for pressures up to 5,000 PSI.

API 6BX flanges are a type of flange with a BX ring groove that is designed for higher pressure applications. They are available in sizes from 1 13/16″ to 30″ and are rated for pressures up to 20,000 PSI. The BX ring groove provides a metal-to-metal seal that is designed to withstand the high pressures and temperatures of the oil and gas industry.

API 6B and 6BX flanges are typically made of carbon steel, stainless steel, or alloy steel and are used in applications such as wellhead connections, Christmas tree assemblies, and other high-pressure equipment. They are designed to withstand the harsh operating conditions of the oil and gas industry, including corrosive fluids, high temperatures, and high pressures.