Wellhead flange

A wellhead flange denotes a flanged connection in the context of wellhead and tree equipment, but the title alone does not define its connection system or technical requirements. API Specification 6A covers wellhead equipment and connectors, yet the word “wellhead” does not automatically mean API 6A or a 6B/6BX flange. The exact connection, governing standard and product scope must be stated in procurement documents. No working pressure, ring-joint style, PSL, material class or temperature class is inferred from the name.