Friedrich Boysen GmbH & Co. KG

Turmfeld plant Altensteig

The Boysen Turmfeld plant has been the group's main plant since the early 1970s. The last stage of its expansion in 2011 saw the Boysen vision of a CO2-optimised factory realised at Turmfeld. Electrical power, heating and cooling requirements are largely covered by alternative sources such as solar and geothermal energy.

Start of production

Turmfeld I1972
Turmfeld II1988
Turmfeld III2011

Production area

Turmfeld I7,500 m²
Turmfeld II10,000 m²
Turmfeld III17,000 m²


Servicesproduction of components and complete exhaust systems, production of bent pipes (single and double wall), exhaust trims and exhaust flaps
CustomersMercedes-Benz, BMW, Audi, Porsche, MAN, MTU, AGCO Fendt, Bentley, Rolls-Royce, Boysen Gruppe

Key features

CO2-optimised factory
certified environmental management according to ISO 14001 and EMAS
Certified information security management system in accordance with VDA ISA (TISAX)
Exhaust treatment systems for large diesel engines (weighing up to 1.3 tons)
Fully automated laser machining centre
CNC-controlled bending machines
5-axis laser cutting system
Tailored Tubes welding system
Welding methods: MAG, WIG, laser
2 Canning systems for car catalytic converters, e.g. gasoline particulate filters (GPF) with single or double-box systems
State of the art automatic measuring cell
Prototype production of car, commercial vehicle and off-highway applications
10 kW flat-bed laser with diode-pumped disk laser
3 customer-specific hot-end production lines
1 portal welding machine for completion


Markus Strebel / Plant Manager
Tel.: +49 (0) 7453 / 20-0
E-mail: friedrich.boysen(at)

Address / Directions

Friedrich Boysen GmbH & Co. KG
Dieselstraße 1
72213 Altensteig