Quality Control

For over 50 years, ZEN Group has been producing quality bearings that meet the stringent demands of our customers. We produce both standard and tailor made custom solutions engineered for the toughest production challenges.

In these fast moving times our combination of creativity, innovation and technical expertise ensures customers worldwide experience consistent, industry leading quality in every bearing we manufacture.
TUV certificate picture
In our industry, the highest standard we can achieve for our Quality Management System is the ISO 9001 certification - awarded by TUV Rheinland. It is the global benchmark that guarantees a total focus on customer service and continual improvement
Visual inspection
The visual inspection is the start of our quality control checks. A trained eye can quickly determine any discrepences or visual faults to the material or assembly.
Radial Clearance
Tolerance Testing
The radial clearance is very important to the operation of the bearing. Our machines are calibrated regularly to ensure the tolerances adhere to DIN standards certificated by the German TUV.
Inner and Outer
Tolerance Testing
The inner and outer tolerance test measures the precise dimensions of the bearing. Our strict tolerances are again set according to the DIN standards.
Noise Testing
Highly sensitive microphones measure and identify audible peaks of a rotating bearing. These peaks can indicate faults to the raceways or possible grease pollution.
Vibration Testing
Using high, medium and low range frequencies, the vibration test can identify a range of bearing defects, such as imbalance, play and misalignment.
Rockwell Testing
The Rockwell test determines the hardness of the material by measuring the depth of penetration of an indenter under load.
DIN logo
All our testing procedures and tolerances are set to DIN standards, certificated by the German TUV.