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The 6202 ZZ is a deep groove ball bearing with specific dimensions: 15mm (bore) x 35mm (OD) x 11mm (width). The 'ZZ' suffix indicates metal shields on both sides, which protect against dust but are not waterproof. You must verify the ABEC rating (ABEC-1, 3, or 5) to ensure the precision level matches your application, and confirm the radial internal clearance (e.g., C0, C2, or C3) to account for thermal expansion during operation.
High-quality 6202 ZZ bearings should be made of GCr15 High Carbon Chromium Steel (SAE 52100). Ensure the supplier provides a Material Test Report (MTR). The hardness should typically reach HRC 60-65 after heat treatment. For high-speed applications, inquire about the grease type used (e.g., Kyodo Yushi or Shell), as lubrication accounts for nearly 80% of bearing longevity.
Suppliers should adhere to ISO 9001:2015 for quality management systems. For specific markets, ensure the products meet RoHS and REACH requirements regarding hazardous substances. If the bearings are for automotive use, look for IATF 16949 certification. Always request a Certificate of Conformity (CoC) to ensure the batch meets the declared technical standards.
The price is highly sensitive to volume and material. Bulk orders (1,000+ units) can reduce the unit price by 20-40% compared to small trial orders. For the best cost-efficiency, sourcing from Made-in-China.com allows you to connect with factory-direct suppliers who offer tiered pricing. Be wary of prices significantly below market average, as they often indicate the use of recycled steel or carbon steel instead of chrome steel.
The primary risks include counterfeit branding and substandard material substitution. To mitigate this, use third-party inspection services (like SGS or Intertek) to perform a hardness test and dimensional check before final payment. Ensure the packaging is robust (anti-rust paper + plastic bags + strong cartons) to prevent corrosion during long-term sea freight.
Focus on the Total Cost of Ownership (TCO) rather than just the unit price. Negotiate for free samples (you pay shipping) to verify quality first. Ask for OEM/Custom marking (laser etching your brand) which is often free for orders over 5,000 units. For payment, utilize Trade Resources on Made-in-China.com to ensure your funds are protected until the goods are shipped.
Due to the high weight-to-volume ratio of steel bearings, Sea Freight (LCL or FCL) is the most economical for orders over 200kg. For urgent, smaller batches, Air Freight or Express (DHL/FedEx) is viable but costly. Ensure the supplier provides a detailed Packing List and Commercial Invoice with the correct HS Code (8482.10) to avoid customs delays and ensure accurate duty calculation.
