Quality Control & Testing — Measured Before It Is Packed
Every NKEN bearing is produced under an ISO 9001 quality management system certified in 2008 and maintained since, at precision grades P0–P2 in GCr15 bearing steel — and checked in our own testing laboratory before it is packed. This page sets out what is measured, and what a buyer can verify.
The in-house testing laboratory
Finished bearings are checked on dedicated measuring instruments before packing. The laboratory measures the properties that decide service life and noise in the machine — not just the dimensions on the drawing:
- Noise and vibration — the check that predicts how a bearing will sound in a motor or gearbox.
- Internal clearance — verified against the ordered execution (standard, C3, C4), because clearance fitted wrong is a leading early-failure cause.
- Roundness and rotary precision — raceway geometry and runout, held to the ordered precision grade P0–P2.
- Friction torque and dimensions — bore, OD and width against the catalogue tolerances for every size.
ISO 9001 since 2008
The quality management system was certified in 2008 and is maintained to this day — one system across the Jiangsu and Shandong factories.
Precision P0–P2
Production precision grades P0–P2, with higher grades (P5, P4) on the ceramic and angular contact lines where the application demands them.
Free samples
Test quality and fit before committing: free samples of most catalogue models are available for your own inspection and measurement.
Third-party QC welcomed
Independent inspection before shipment is welcomed — your inspector or agency checks the goods against the order specification.
Specification is part of quality
Most bearing failures blamed on quality are specification errors: the wrong clearance, cage or coating for the duty. NKEN quotations therefore confirm the execution — seals, clearance, cage, coating position on insulated bearings — before production or dispatch, and the guides in Insights publish the same selection method our sales team uses. Bearings supplied under your brand through the OEM programme pass through exactly the same laboratory.
Send us your inquiry
Tell us the model and quantity — we reply with price, stock status and delivery time. Free samples available for most models. Prefer to talk? WhatsApp James Ke at +86 188 9536 7568 (24/7 support).
Send us the bearing number you buy today.
We cross-reference it against 2,000+ stocked NKEN models and quote price, stock and delivery — free samples on request.