Import Bearing Of High - Voltage Motor — Buy in wholesale FOB from Supplier in China

This insulated rolling-element bearing is designed for high-voltage induction motors where electrical discharge through the bearing raceway would otherwise cause premature failure. The construction uses chrome steel (GCr15) as the base material with an aluminium oxide (Al2O3) ceramic insulation coating applied to the outer or inner ring to block circulating currents. It conforms to IEC standard dimensions and fits the 8482 bearing-type classification for medium and large electric motors. The insulation layer typically achieves breakdown voltage resistance above 1000 V DC, though the exact coating thickness and resistance value for this unit should be confirmed with the supplier.

GCr15 is the standard Chinese designation for AISI 52100 high-carbon chromium bearing steel, offering a typical hardness of 60-65 HRC after heat treatment and good dimensional stability up to 150 degrees C. The Al2O3 plasma-spray coating is the industry-preferred method for motor bearing insulation, being more durable than polymer coatings in contaminated or humid environments. Standard clearance groups for this application are C3 or C4 to accommodate thermal expansion in motor housings. The bearing is supplied with standard international packaging for sea freight, though specific crate dimensions and desiccant specifications are not stated in the listing.

Primary buyers are electric motor rebuilders, power-generation maintenance departments, and OEMs serving mining conveyors, cement mills, and petrochemical compressors. The bearing suits both drip-proof and totally enclosed fan-cooled (TEFC) motor configurations. Import buyers should verify whether the supplier holds current ISO 9001 certification, as claimed, and request a mill certificate showing actual hardness, roundness, and coating adhesion test results. Payment terms and minimum order quantities are not disclosed and must be negotiated directly.

Qingdao Rensheng Huida Trading Co., Ltd. is located at Room 4003, Block B, 226 Mid Changjiang Road, Qingdao 266555, Shandong Province, a major port city for northern China industrial exports. The supplier is classified as an imported-tier vendor with a harbor trust designation, indicating it is a registered trading entity rather than a manufacturer. The response rate shown is 0.00 percent with zero average response hours recorded, which suggests the account has limited active engagement history on the platform. Buyers should treat initial contact with standard due diligence and request direct communication channels.

The listing presents itself as a trading company specialising in industrial spare parts, specifically bearings for electric motors. No factory ownership, production capacity, or in-house engineering staff is claimed. The supplier asserts ISO and SGS certification compliance, but no certificate numbers or scopes are provided, so buyers should obtain current copies. The address places the firm in Qingdao's central business district rather than an industrial zone, consistent with a trading office model. There is no stated year of establishment, registered capital, or employee count in the available profile.