Custom Bearing Manufacturer FAQ

A: ZZ: Double-layer metal shield provides moderate sealing against solid contaminants. 2RS: Double rubber seal effectively seals against both solid impurities and liquids. LLB: Double-lip contact seal provides moderate sealing against contaminants. LLU: Double-lip contact seal with inner flange enhances sealing performance, preventing contaminants and harsh environments.

These names indicate different types of seals used in bearings, each with varying sealing performance. ZZ and LLB seals offer moderate sealing against solid impurities, while 2RS and LLU seals provide better sealing against both solid impurities and liquids. The LLU seal also features an inner flange for improved sealing in harsh environments. The choice of seal type depends on the specific application and environmental conditions.

A: A deep groove ball bearing is a non-separable bearing. The line connecting the contact points of the inner ring, balls, and outer ring forms a 0° angle in the radial direction. Deep groove ball bearings primarily bear radial loads, but can also withstand axial loads in any direction. Angular contact bearings are also non-separable. The line connecting the contact points of the inner ring, balls, and outer ring forms an angle with the radial line, called the contact angle. Angular contact bearings can withstand relatively heavy unidirectional axial loads in addition to radial loads. The larger the contact angle, the greater the axial load capacity.

A: Yes, all deep groove ball bearing models manufactured by BLH Bearings are interchangeable with the same models from Timken, SKF, FAG, NSK, NTN, RBC, IKO, INA, and NACHI brands.

A: Bearing grades are determined by the following: ABCE. C3 is a clearance specification one grade higher than "C Normal" (sometimes called "C0" in deep groove radial ball bearings). For more C3 models, please contact BLH bearing engineers.

A: In common bearing models, most bearing manufacturers use a standard grease fill level of 30% of the bearing free space. Low-speed applications in harsh environments (such as agricultural machinery) sometimes require a higher fill level. High-speed applications (such as hand tools) may require a lower fill level. BLH bearing factory can customize production; engineers can design solutions based on the user's operating conditions.

A: Currently, BLH bearings does not have authorized distributors. For any sales inquiries, please contact our sales staff and our headquarters team.

A: Yes. Upon request, we can provide Certificate of Conformity (C of C), material certificates, inspection reports, and information on RoHS compliance and material traceability. Furthermore, our company has successfully obtained ISO 9001 (ISO 9001:2015 Quality Management System – Requirements) certification.

A: For products currently in stock, our standard delivery time is typically 1-3 business days. However, for orders requiring large-volume production, our estimated production time is generally 4-5 weeks.

A: For lightweight goods, our standard shipping method is usually arranged through the customer's account or prepaid, using reputable carriers such as UPS or FedEx. For larger quantities of heavy goods, we usually arrange air or sea freight. Please note that the customer is responsible for all related costs, duties, taxes, and other associated fees.

A: As a general guideline, GcR15 chromium steel bearings, when properly stored after production, typically have a shelf life of at least 3 years. It is recommended to check bearings for signs of rust, unusual noises, and the condition of the lubricating grease before shipping them to customers, especially bearings that have been in stock for more than 3 years.