About us
Klein GmbH - your reliable partner for customized solutions in the fields of hydraulics, mechanical engineering and robotics. Find out more about our expertise and corporate philosophy.
Welcome to Klein GmbH
Since 1963, we have been an established company in the manufacture of rotary unions and customized mechanical engineering components. With over 60 years of experience, we not only offer four different types of rotating unions, but also manufacture rotating unions exactly to our customers’ specific requirements. Our rotary unions enable the safe and reliable guidance of a wide range of media, such as air, hydraulic oil, emulsions, steam, water, thermal oil and many more – regardless of whether a low or high operating pressure is required, we cover it all.
Thanks to our modern CNC technology in 3-axis and 5-axis machining, we manufacture precise turned and milled parts – from simple components to sophisticated explosion-proof components. With extensive knowledge of various manufacturing processes, such as casting, extrusion and plastic injection molding, we produce components efficiently and profitably.
Our 15 machining centers and a production area of 1,800 m² enable us to implement even the most complex production orders with the highest precision. In addition to manufacturing, we also offer CAD design, assembly and prototype construction. Whether you need turned and milled parts or a complex custom-made product – we offer you tailor-made solutions. Contact us and benefit from our many years of expertise.

Klein GmbH at a Glance
Four numbers that show what we stand for.
- 1963
Foundation
- 1800 m²
Production area
- 20
Employees
- 15
Machining centers
The story behind the Klein GmbH company
From our founding in 1963 to the present: the key milestones in our company's history.
Company History- 1963
Founded by Ernst Klein
Started developing and manufacturing rotary unions and pneumatic cylinders.

- 1972
Start of construction of the new company building
Construction of the new corporate headquarters begins on a lot that, at the time, still housed a barn.

- 1973
Move to the new company building
Move to the new company building at the current location.

- 1977
First CNC production lathe
Investment in the first CNC production lathe.

- 1978
Expansion of the CNC machine park
Entry into complex contract manufacturing.

- 1982
Leadership change
The managing partners are passing the baton to the second generation: Friedhelm Klein and Karin Kunkel.
- 1990
Construction of the production hall
The production facility, with over 1,800 m² of production space, is being built.
- 2000
Investments in Machinery
Initial investments in the partial automation of processes and work steps.

- 2005
Certification
TÜV certification in accordance with DIN/ISO 9000.
- 2008
Explosion-proof parts
Start of production of explosion-proof components.
- 2019
Change in Leadership
Change of managing partners into the third generation.
- 2022
Investments
Purchase of Spinner milling machines.
- 2023
Digitization
Modernization of internal IT and brand presence.








