Bellows Single-Layer Metallic


Metal expansion joints are indispensable elements for duct systems, they are used to compensate for changes in length which arise in duct systems from temperature differences. In addition, they are able to absorb vibration arising from pumps, motors, compressors or turbines. Axial, lateral or angular movements can be compensated depending on the specific situation, and we are happy to advise you on the best type of bellows.

The metal expansion joint can be manufactured in a round and a rectangular cross section.

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There are 3 main corner designs for metal expansion joints. Round corners, miter- or double miter corners.

Nominal Diameters

DN 15 to DN 6000. From DN 250 intermediate sizes can be manufactured without considerable additional costs.
Rectangular expansion joints can be manufactured in any size.


The materials used are carbon steel (like dc04st37, Corten), high-alloyed ferritic steels (like 16mo3) and austenitic steels (like 1.4301 (304), 1.4541(321)).
Alternative or custom material, according customer specific requirements can be used during construction and fabrication, to ensure the correct bespoke applicable solution.


We can supply welding parts, loose and fixed flange connections, threaded connections all produced according to German and international standards. We also manufacture special connections, produced according to customers’ drawings.

The fittings and anchoring consist of unalloyed steel, rustproof and acid resistant stainless steel or heat-resisting steel depending on request.