Quality & Testing

A professional approach

we are recognized for our adherence


Quality Mission: “To Give Accurate Results At Right Time With Team Approach”

Understanding the relevance of a Quality Management System, ZNL Bearings Pvt. Ltd. is ISO 9001-2015 & IATF 16949-2016 certified company, hence we strictly adhere the Quality Management System.

We are doing all the CORETOOLS related activities like APQP, PPAP, PFMEA, SPC & MSA for new development of O.E.M. items. We are regularly doing SPC (control chart Xbar- R chart with Cp &Cpk value) for critical parameters like ID size of IR and OD size of OR.

As a IATF 16949-2016 certified company, we have document and Data control system and also doing inspection and Testing of Incoming material, In process and Final Product as per documented procedure.

We also have system for controlling non-confirming product and promote corrective and Preventive action accordingly.

“The commitment to quality
The commitment to Growth”
A systematic flow

How we work?

only the superior most

Raw Material


Rings, Rollers, Balls – Bearing Steel SAE 52100
For Special Requirement – 8620,SS 440,AMS 6444,AMS 6414
For Steel Cage – as per IS 4397
For Brass Cage – as per DIN 17660

  • Chemical composition analysis of raw material is done before forging of each batch.
  • Microstructure & HRC is checked after annealing & heat treatment.
  • Case hardening with special applications and requirements is also undertaken.

Inspection and Testing

Tests bearing's life

Life Testing Machine

Indigenous designed Life Testing Machine is capable of testing bearing life for 30mm to 180 mm Outer diameter of bearing. This machine is designed such a way that we can apply maximum 20T Radial and Axial load on the bearing. This is fully Automatic machine with SCARDO system and it shows indication of RPM of Shaft, temp. of bearing, load applied on the bearing etc. on computer screen. By calculating load and RPM, we can find out the the hours for bearing and accordingly we can test L10 Life of bearings.

Life Testing Machine 11
Life Testing Machine 21
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TESTS SURface finish

Surface Roughness Testers

Surface roughness tester instrument is used to check surface finish of the races after honing and grinding process.

tests vibration level

Noise Checking Machines

As name suggest, this instrument is used for checking noise and vibration level of Taper, Cylindrical, Spherical, angular contact and deep groove ball bearings.

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tests composition

Chemical laboratory for chemical analysis

We have established Metallurgical Lab. We can check chemical composition like C, Cr, Mn, S, Hardness , Decarb, Microstructure, Grain size and Inclusion rating in Raw Material AND Annealed material.
We can also check Hardness (HRC), Microstructure, Grain size & Inclusion rating in Heat Treated components.