Import 6300 Series Deep Groove Ball Bearing — Buy in Bulk from Supplier in China

The 6300 series deep groove ball bearing from Zhenjiang Zhongjian Bearing Co., Ltd is a single-row radial bearing with a deep raceway geometry that accommodates both radial and axial loads in either direction. Manufactured from through-hardened chromium alloy steel, these bearings feature precision-ground raceways and Grade 10 steel balls for consistent running accuracy. The open design allows for external lubrication access, while optional shields or seals can be fitted for contaminated environments. Standard bore diameters in this series range from 10 mm to 50 mm, with corresponding outer diameters from 35 mm to 110 mm and width dimensions from 11 mm to 27 mm.

The inner and outer rings are typically manufactured from AISI 52100 chrome steel with a hardness of 60-65 HRC, providing fatigue resistance under cyclic loading. Cages are generally pressed steel or brass, depending on speed and temperature requirements. Radial clearance groups range from C2 (tighter) to C5 (looser), with C3 being standard for general industrial applications. Typical tolerance classes are P0 (normal) or P6 (improved), with P5 available for precision spindles. The deep groove geometry achieves a contact angle near zero under pure radial load, with axial load capacity approximately 60% of radial capacity for single-row designs.

Primary buyers include electric motor rebuilders, agricultural machinery OEMs, automotive component suppliers, and general industrial maintenance departments. These bearings suit applications from fractional horsepower motors to conveyor pulleys and gearbox shafts. When sourcing from Zhenjiang Zhongjian Bearing Co., Ltd, confirm the exact variant (open, ZZ shielded, or 2RS sealed), the required radial clearance, and whether the application demands enhanced running accuracy. The supplier's Jiangsu location offers access to Shanghai port for seafreight consolidation.

Zhenjiang Zhongjian Bearing Co., Ltd is located at Zhongtian Road #1 in Zhenjiang, Jiangsu Province, China, with postal code 212141. The supplier holds an imported tier classification and a harbor trust tier on the platform. The response rate transcription shows 0.00 and zero average response hours, which indicates no response data is available rather than confirmed non-response. No verified export licence, ISO certification status, or factory audit details are stated in the available profile information.

The listing presents the 6300 series as an industrial-grade bearing line without specifying whether Zhongjian manufactures these in-house or sources from a partnered foundry. The source description references ISO and ASTM compliance without attaching certificate numbers or scopes. Buyers should verify the supplier's actual manufacturing scope, whether heat treatment and grinding are performed on-site, and what inspection records accompany each production lot. The Jiangsu location sits within China's established bearing manufacturing cluster, which provides component supply chain density but does not alone confirm technical capability.