6308-2RS Deep Groove Ball Bearing | Heavy-Duty Double Rubber Sealed Performance | 40×90×23 mm

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.

Constructed to endure extreme mechanical forces while maintaining high rotational efficiency, the 6318-ZZ is a heavy-series deep groove ball bearing designed for the most demanding industrial applications. Fortified with dual pressed-steel shields (ZZ), this bearing excels at retaining its factory-filled lubricant while blocking out larger particulate contaminants. Because these metal shields are designed not to make physical contact with the inner ring, the 6318-ZZ minimizes friction and startup drag, making it an exceptional choice for large 90mm bore equipment like high-capacity electric motors, heavy-duty centrifugal pumps, and mining conveyors.

Engineered for harsh operating environments that demand maximum sealing integrity alongside high load capacities, the 6317-2RS is a premier heavy-duty deep groove ball bearing. Outfitted with dual synthetic rubber contact seals (2RS), it provides a complete barrier against fine dust, moisture, and aggressive contaminants while ensuring zero leakage of internal lubricants. Because these heavy-duty seals create a secure lip-contact with the inner ring, the 6317-2RS delivers unmatched protection and durability, making it the top selection for large-bore (85mm) applications like high-vibration electric motors, rugged agricultural machinery, and heavy industrial drives.

Engineered to withstand demanding operational environments and massive radial loads, the 6315-ZZ is a premium heavy-series deep groove ball bearing. Equipped with dual pressed-steel shields (ZZ), this bearing provides an excellent barrier against industrial debris, dirt, and particulates while securely retaining its factory-filled lubrication. Because these metal shields remain contactless with the inner ring, the 6315-ZZ operates with significantly less friction than its rubber-sealed counterparts. This ensures efficient heat dissipation and sustained operational speeds, making it the go-to solution for 75mm bore equipment such as large electric motors, industrial gearboxes, and heavy manufacturing machinery.

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.