Double Studded Adapter Flanges
A Double Studded Adapter (DSA) is commonly used to connect flanges with different nominal sizes, pressure ratings, and configurations. For example, a DSA can be used to connect an API 6A 7 1/16 10M flange to an API 6A 5 1/8 5M flange. Although most commonly used to connect API 6A style flanges, WeldFit can design and manufacture DSA's for any combination of API, ASME, MSS and other flange styles.
Key Features:
- Can be used to connect flanges with any combination of sizes and pressure ratings
- Custom DSA's are available to transition between API, ASME, MSS or other styles of flanges
- Supplied with standard or customer specific thicknesses
- Normally provided with tap-end studs and nuts
- Available for general service and sour service in compliance with any temperature rating and material requirements specified in API Specification 6A
- Available with Stainless Steel 316L or Inconel 625 corrosion resistant ring grooves
- Manufactured in compliance with WeldFit’s API and ISO 9001:2008 certified quality program
Ordering Information:
- Nominal size, pressure rating and configuration of each flange
- API 6A temperature classification or minimum/maximum design temperature
- API 6A material classification or required material
- Required thickness, if non-standard
- Corrosion resistant alloy material, if required — common CRA materials are 316L Stainless Steel and Inconel 625
Custom Manufacturing
WeldFit is a world-class provider of custom designed and manufactured products for the oilfield, pipeline, refining, and petrochemical industries.
Whether you have a complete design package or a conceptual idea, WeldFit has the experience, skills, and equipment to manufacture products that meet your needs for quality and reliability.

