638-ZZ Deep Groove Ball Bearing For Compact Drives & Small Motors | 8×28×9 Mm

Part of the robust 63 dimension series, the 6307-2Z ball bearing is engineered with a thicker cross-section to accommodate heavier load requirements than its 62 series counterparts. Featuring boundary dimensions of 35 mm (bore), 80 mm (outer diameter), and 21 mm (width), this bearing is enclosed on both sides with non-contact metal shields (-2Z or ZZ). This shielded architecture effectively prevents the ingress of dust, dirt, and metallic debris while retaining the internal lubricant, making it an ideal maintenance-free solution for industrial environments.

The 6307-2RS is a robust, single-row radial bearing designed for demanding environments where both high load capacity and superior sealing are critical. Featuring a 35 mm bore, 80 mm outer diameter, and 21 mm width, this 63-series bearing is equipped with contact rubber seals (2RS/RS) on both faces. These reinforced seals act as a physical barrier against liquid splashes and fine abrasive dust, ensuring the internal raceways remain pristine during heavy-duty operation in outdoor or industrial settings.

The 6307 is a robust single-row deep groove ball bearing engineered for medium-duty rotating equipment that demands consistent performance under continuous load. Built to the ISO 63 medium series, this component balances a 35 mm bore with a 21 mm cross-section, making it a preferred choice for industrial drives, conveyor systems, and heavy-duty electric motors. Welink Bearing manufactures this series to strict dimensional tolerances, ensuring reliable operation in demanding mechanical environments where uptime and load capacity are critical.

The B17-99-2RS is a specialized, heavy-duty single-row deep groove ball bearing tailored predominantly for high-stress automotive electrical systems and demanding industrial components. Recognized for its unique, wider cross-section relative to standard bearings, this model excels at absorbing severe belt tensions and radial loads. Equipped with dual advanced Nitrile Butadiene Rubber (NBR) contact seals, it effectively isolates the internal rolling elements from engine grime, road salt, and moisture. Boasting a 17mm bore, 52mm outer diameter, and a robust 17mm width, the B17-99-2RS is the industry benchmark for rebuilding alternators and high-output generators.

Developed specifically for compact mechanical assemblies requiring enhanced radial stability without a larger housing footprint, the 63800-ZZ is a premium extended-width thin-section deep groove ball bearing. Outfitted with double metal shields (ZZ), it effectively blocks out airborne contaminants while retaining its factory-applied premium lubricant. Because these steel shields never make physical contact with the inner ring, the 63800-ZZ minimizes operating drag and startup torque compared to contact rubber seals, making it an excellent solution for 10mm shaft designs like camera gimbals, high-torque drone motors, and micro-robotic joints.

The 6304 is an unsealed, premium-grade Single-Row Deep Groove Ball Bearing engineered for integration inside secure, enclosed mechanical housings. By entirely omitting side shields and rubber seals, this bearing offers unhindered access to its internal rolling elements, maximizing the flow of external lubricants. With precise metric dimensions of a 20 mm bore, a 52 mm outer diameter, and a 15 mm width, it is categorized under the medium-duty ISO 6300 series. This beefier structural profile provides significantly higher radial and axial load-bearing capabilities than lighter 6000 or 6200 series alternatives of the same bore size.

The 6302-2RS is a premium-grade, Double Rubber Sealed Single-Row Deep Groove Ball Bearing designed for superior protection in demanding environments. Optimized for high-torque applications and heavy-duty machinery, it employs dual contact seals (2RS) to lock in high-quality lubricant while providing an airtight defense against moisture, dust, and grime. With its 15 mm bore, 42 mm outer diameter, and 13 mm width, this bearing belongs to the 6300 "Medium" ISO series, offering significantly higher load-bearing capacity compared to light-duty alternatives.

The 6300-2RS is a robust, single-row deep groove ball bearing manufactured to deliver consistent load-bearing capability in demanding mechanical environments. Distinguished by its dual-contact rubber seals (2RS), this component offers exceptional ingress protection, effectively locking in factory-filled grease while blocking out water, mud, and abrasive particulates. With a 10mm bore and a substantial 35mm outer diameter, the 6300-2RS is an integral solution for electric motors, heavy-duty power tools, and agricultural equipment that require prolonged service life under harsh operating conditions.