MR128-ZZ Miniature Deep Groove Ball Bearing | High-Speed Shielded Micro Bearing | 8×12×3.5 mm

The MR104 is a precision-engineered, single-row miniature ball bearing designed for mechanical configurations where internal space is strictly limited and operating speeds are exceptionally high. Characterized by its unshielded, open architecture, this 4x10x3 mm component offers zero seal-induced friction. It allows the direct flow of external lubricants, making it an indispensable part for internal assemblies, sealed gearboxes, and oil-bath environments where external contamination is already managed by the main housing.

The MR85-ZZ is a specialized single-row miniature deep groove ball bearing characterized by its exceptionally slim profile. With a 5mm bore and an 8mm outer diameter, this 5x8x2.5 mm component is engineered for highly restricted radial spaces where weight reduction and precise rotational mechanics are paramount. Protected by dual non-contact pressed steel shields (ZZ), it effectively guards internal raceways against dust and contaminants while ensuring zero frictional drag, making it the premier choice for ultra-compact, high-speed instrumentation.

The MR85-2RS is a high-performance, single-row miniature bearing specifically developed for engineering designs that prioritize moisture resistance and space optimization. Featuring dual synthetic rubber contact seals (2RS) on a slim 5x8x2.5 mm frame, this component offers a fortified barrier against liquid ingress and fine particulates. Its ultra-compact geometry is ideal for micro-actuators, waterproof servos, and portable consumer electronics, ensuring that the internal precision raceways remain shielded and the lubricant is retained even in high-vibration environments.

The MR85 is a precision-engineered, single-row miniature ball bearing designed for applications where minimizing rotational drag and maximizing space efficiency are the top priorities. Defined by its unshielded "Open" configuration, this 5x8x2 mm component eliminates the friction typical of contact seals, allowing for seamless high-speed operation. It is specifically intended for use within enclosed housings or oil-bath environments where the bearing is already protected from external debris, ensuring smooth power transmission in the most compact mechanical footprints.

The MR84-ZZ is a high-performance, single-row miniature ball bearing engineered for applications that require a perfect equilibrium between a small footprint and structural rigidity. Featuring a 4x8x3 mm geometry, this component is equipped with dual non-contact metal shields (ZZ) that protect the internal raceways from larger debris while ensuring the lowest possible starting torque. Its balanced width-to-diameter ratio makes it an essential component for high-speed micro-motors and precision encoders where dynamic stability and low heat generation are critical for long-term reliability.

The MR84-2RS is a premium-grade, single-row miniature ball bearing built for mechanical systems that demand strict environmental shielding alongside structural compactness. Featuring twin synthetic rubber contact seals (2RS), this 4x8x3 mm component establishes a robust defense against moisture, particulate matter, and operational debris. Its highly efficient architecture is ideal for stepper motors, medical instruments, and consumer electronics, guaranteeing that the internal raceways stay uncontaminated and the factory-applied grease remains locked in for long-lasting, maintenance-free operation.

The MR74-ZZ is a high-performance miniature ball bearing crafted for ultra-compact systems where frictionless rotation and foundational particulate defense are paramount. Fitted with dual non-contact pressed steel shields (ZZ), this 4x7x2.5 mm component creates a reliable safeguard against large dust particles while eliminating the drag associated with rubber seals. Its low-friction profile is specifically engineered for high-speed micro-motors, precision instruments, and robotics, ensuring internal raceways are kept clean and the specialized lubricant is securely housed for an extended operational lifespan.

The MR74-2RS is a precision-engineered miniature bearing designed for applications where high-level sealing is required within an ultra-slim footprint. Equipped with dual synthetic rubber contact seals (2RS), this 4x7x2.5 mm component creates an airtight barrier that effectively blocks out moisture, fine dust, and liquid splashes. Its compact profile is specifically optimized for outdoor electronics, waterproof servos, and medical handpieces, ensuring that the internal components remain lubricated and shielded even in contaminated or humid operating conditions.