The Company

About Koellmann Airtec

The name Koellmann has stood for products of the highest standard since 1904. As business units of Thielenhaus Technologies GmbH, Koellmann Airtec and Koellmann Gear combine innovations of today with our many years of experience in the manufacture of compressors and gearboxes. In the service of our customers, we are able to set the highest quality standards, which is proven by the multitude of Koellmann gearboxes and compressors in use worldwide.

About Koellmann

With its membrane compressors, Koellmann Airtec has successfully served the demanding market of plastering machines since the early fifties of the last century. Here, compact mobile compressors are required, which produce cost-effective and reliable oil-free compressed air. In addition, these compressors also are in use in food production and laboratory technology.

Koellmann Gear is a global player in the field of gear technology for special drives. One of the central application areas is plastics processing. Especially as a manufacturer of extruder gearboxes, Koellmann Gear has a very good reputation worldwide. Further areas of application are process engineering as well as the textile and paper industry.

Both business units are characterized by an extremely high quality awareness and a high degree of customer and service orientation. Decades of experience create the prerequisite for these customer-specific gearboxes and compressors to operate cost-effectively and with high efficiency.


Today’s Koellmann Gear Division of the Thielenhaus Group dates back to the Köllmann GmbH gear factory, which was founded in Leipzig in 1904. Originally producing precision gear wheels and specialising in bevel gears, in 1907, Köllmann became the first special factory to produce rear axles and change speed gears for the automotive industry. Köllmann also produced the gear cutting tools required for this work. In addition to the production of gears and tools in Leipzig, long milling machines were built in Langenberg. The company then moved its headquarters there after the end of the Second World War, before moving to Düsseldorf-Heerdt in 1951.

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