B17-99-2RS Heavy-Duty Sealed Ball Bearing | High-Temperature Alternator Performance | 17×52×17 mm

The 6302-ZZ stands as a highly versatile, dual-metal-shielded single-row radial ball bearing engineered to deliver exceptional performance under elevated operational speeds and steady radial loads. To minimize drag, this model incorporates twin non-contact pressed steel shields (ZZ) that form a precise barrier over the internal mechanics, retaining factory-applied grease and deflecting dust without creating mechanical friction. Featuring standardized metric dimensions—a 15 mm bore, 42 mm outer diameter, and 13 mm width—the 6302-ZZ provides a highly dependable mechanical solution for power tools, electric motors, and automotive sub-assemblies.

The 6303-2RS represents a highly versatile, single-row radial bearing crafted for exceptional durability and uncompromising contaminant resistance. Outfitted with twin synthetic rubber seals (2RS) that make physical contact with the inner ring, this model securely locks in the factory-applied lubricant while creating a formidable barrier against water, dirt, and industrial grime. Manufactured to standard metric measurements—featuring a 17 mm bore, 47 mm outer diameter, and 14 mm width—the 6303-2RS is an indispensable component for power transmission systems, high-speed power tools, and automotive auxiliaries where reliability is paramount.

The 6301-ZZ stands out as a highly reliable, dual-metal-shielded single-row radial ball bearing engineered to deliver smooth rotational agility under high-frequency conditions and steady radial forces. To minimize power loss, this model incorporates twin non-contact pressed steel shields (ZZ) that form a precise gap over the internal elements, successfully locking in factory-applied grease and deflecting micro-particulates without introducing frictional resistance. Featuring standard metric dimensions—a 12 mm bore, 37 mm outer diameter, and 12 mm width—the 6301-ZZ provides a perfect mechanical solution for compact power tools, small electric motors, and modern appliance hardware.

Engineered as part of the robust 6300 medium-duty series, the 6307-2RZ is a high-performance single-row deep groove ball bearing featuring advanced non-contact rubber seals. With a 35 mm bore, an 80 mm outer diameter, and a substantial 21 mm width, this component is built to handle significant radial and axial loads. The defining feature of the "2RZ" designation is its specialized sealing technology: the rubber lips closely approach the inner ring without making physical contact. This innovative design offers a superior middle ground, delivering far better dust and moisture resistance than standard metal shields (ZZ), while completely avoiding the friction, heat generation, and speed limitations caused by traditional contact seals (2RS).

Engineered to deliver exceptional rotational accuracy in compact spaces, the 636-ZZ is a premium miniature single row deep groove ball bearing equipped with dual metal shields. Unlike open configurations, the "ZZ" design features pressed steel shields on both sides of the bearing. These non-contact shields act as a robust barrier against the ingress of dust, metallic debris, and environmental particulate matter, while simultaneously retaining the factory-applied lubrication. This makes it an essential, maintenance-free solution for sensitive, high-speed applications like micro-motors, precision instruments, and consumer electronics where reliable, low-noise operation is strictly required.

Engineered for micro-mechanical applications requiring ultra-fast rotation and low frictional torque, the 633-ZZ is a premium miniature single row deep groove ball bearing equipped with dual metal shields. Unlike heavy-duty or rubber-sealed counterparts, this micro-bearing utilizes non-contact steel shields that offer excellent defense against dry dust and debris while maintaining virtually zero drag. This makes it an essential component for compact, high-velocity mechanics such as 3D printers, robotics, and small electric motors, where preserving kinetic energy and managing tight clearances are top priorities.

Built to endure rigorous operating conditions and heavy mechanical stress, the 6311-ZZ is a premium medium-to-heavy series deep groove ball bearing. Equipped with dual pressed-steel shields (ZZ), it provides an excellent barrier against industrial debris and particulate contamination while securely retaining the factory-applied lubricant. Because the metal shields are non-contacting, this bearing minimizes friction and heat generation, making it the optimal solution for high-load, 55mm shaft applications such as large electric motors, industrial gearboxes, and agricultural equipment.

Built for demanding mechanical environments that require high load tolerance in a miniature form factor, the 639-ZZ is a robust deep groove ball bearing from the 630 medium-duty series. Outfitted with dual pressed-steel shields (ZZ), it provides exceptional defense against industrial dust and particulate ingress while securely locking in the factory-applied lubricant. Because these metal shields are non-contacting, the 639-ZZ operates with minimal friction and significantly reduced startup torque, making it an outstanding choice for 9mm shaft applications like power tool armatures, electric motor rotors, and industrial pumps.