Double Studded Adapter flange is the part which is often used in the wellhead system. DSA is a flange with a through bore and a ring groove on each side, drilled and tapped bolt hole sets on both sides and tapped end studs complete with nuts fitted on both sides. These are designed and manufactured in accordance with API 6A standard, DSA usually has double studded flange. we have all sizes and pressure ratings and used for oilfield applications.