ZMZ operates an ISO-certified quality management system with an on-site laboratory equipped with 8 categories of precision measurement instrumentation. Quality at ZMZ is not a final inspection checkpoint — it is embedded into every stage of production from incoming steel verification to final noise and vibration sorting.
Spectrometer analysis of incoming steel chemistry.
Hot forging press, bearing ring blanks.
Case hardening, HRC 60–65 target hardness.
Inner and outer ring bore and OD turning.
Raceway and track grinding to tolerance.
Raceway surface finish to Ra < 0.05 μm.
Ball set insertion, cage fitting, sealing, lubrication.
Dimensional, noise/vibration, load testing.
Individual and bulk packaging, export documentation.
Spectrometer
Incoming steel chemical composition — carbon, chromium, alloy content
Length Measuring Instrument
Bore, OD, and width dimensional accuracy to micron level
Profile Roughness Meter
Raceway surface finish — Ra value verification
Three Coordinate Measuring Instrument (CMM)
3D geometric accuracy of complex features
Metallographic Microscope
Steel microstructure — carbide distribution, grain structure
Static Pressure Machine
Radial and axial load capacity testing
Projector (Optical Comparator)
Profile and contour inspection — non-contact
Salt Spray Testing Machine
Corrosion resistance of seals, cages, and plated surfaces
Non-standard dimensional profiles, tailored metallurgy, and custom components manufactured exactly to your proprietary CAD design specifications.
