Renzing GmbH


Since 1929 RENZING has developed technically demanding and economically sound products for complicated applications.  With our flexible, ultra-modern machinery, we are able to meet the constantly rising demands of our customers.
RENZING is a partner of its customers and offers a complete programme of spring technology for many branches of industry.  We offer assistance in design, choice of materials, thermal treatment, surface finishing, packaging (including unit packages) and logistics.

RENZING is one of the leading manufacturers of high-stressed springs for door closers and a partner of the automotive supply industry with regard to demanding components of brake systems for the construction of cars and commercial vehicles.

Certification in accordance with DIN EN ISO 9001:2008 and ISO/TS 16949, supplier evaluations and audits, among others from automotive suppliers.

Quality inspections which accompany the manufacturing process via SPC, outgoing goods and first article inspections (VDA + PPAP) with statistical evaluation and documentation.

Dynamic endurance spring testing with simulation of prescribed load changes.

Coiling and bending machines
with material diameters from 0.25 mm to 12 mm, CNC-controlled.  Equipped with contact-free length measuring devices for monitoring, separating, and documenting.

Grinding machines for spring ends
for plane-grinding the contact surfaces of compression springs

Setting devices
for cold and warm setting as well as testing high-stressed compression springs

Tempering and hardening furnaces
for thermal treatment

Shot peening devices
for surface hardening

Punched and bent parts
Punching and bending presses (Raster, Bihler) for shaped and flat springs

Pressing (eccentrics and hydraulics)
Punched parts for small and medium series

for manufacturing tools for cutting, punching, bending as well as follow-on tools.

Quality assurance
All testing processes, optical measuring


• Automotive supply industry
• Construction sub-supply industry
• Fitting technology
• Machine and plant engineering
• Measurement and control technology
• Environmental technology
• Valve industry
• Agricultural machine industry
• Chemical industry
• Electric and electronic industries
• Medical technology
• Plastics technology