Double studded adapter flange is a combination of flanges of different sizes and pressure ratings. DSA for reliable and consistent performance on their production system. Our adapter flanges are in various sizes and pressure ratings as per customer's specified thickness, consistent with design considerations. It is the important device to connection the different flange for wellhead, so the material of the body and studs and nuts shall be conforms the related requirements. The size is in accordance with API 16A flange certification.