Din11864 1 2a 3 Form A

DIN11864 is a standardized connection system for stainless steel process piping where cleanability and controlled sealing matter. The Part 2 aseptic nut flange uses a bolted flange and an O-ring seal to join compatible pipe ends while reducing crevices that may retain product residue.

How the Part 2 Flange Supports Aseptic Piping

An SS316L nut flange with a flange-weld connection is intended for aseptic process installations, including pharmaceutical and chemical production. Its sealing geometry supports a smooth internal passage, while the bolted joint provides a fixed connection for installed pipework. Actual cleanability depends on correct component matching, surface finish, installation quality, and seal compatibility.

The connection must suit the tube outside diameter, mating flange profile, and required operating conditions. An O-ring that resists the process medium and cleaning chemicals is essential to maintaining seal integrity during service.

Three DIN 11864 Connection Formats Compared

Supplier searches for din 11864 1 form a generally refer to the screwed aseptic union. Its fastening method differs from a flange joint, so the mating component and sealing profile must be checked before parts are substituted.

The term din 11864 2a is often used as shorthand for a Part 2 Form A flange assembly. Before ordering, the dimensional drawing should confirm the O-ring groove, mating face, bolt pattern, and nominal size.

Where frequent disassembly is required, din 11864 3 form a generally refers to the clamp-style connection family. A clamp may simplify maintenance access, while a bolted flange suits a fixed installation. Both designs require compatible seals and pipe dimensions.

Checks Before Specifying a Nut Flange

Confirm the nominal diameter, tube outside diameter, flange geometry, bolt layout, gasket elastomer, and internal surface roughness. For orbital welding, alignment and post-weld finishing affect the wetted surface and its cleanability. The selected seal must also withstand the process fluid and cleaning cycle.

Pressure and temperature limits should be verified for the exact assembly, pipe size, and gasket material. A standard designation alone does not establish the operating rating of every finished connection.

Technical Data

Product Parameter