684-ZZ Micro Deep Groove Ball Bearing Shielded For 3D Printing & Office Automation | 4×9×4 mm

The 687-ZZ is a highly specialized thin-section miniature bearing engineered for demanding electromechanical systems where radial space is strictly limited but high rotational accuracy is mandatory. Equipped with dual non-contact metal shields (ZZ), this compact component effectively repels particulate contamination while retaining its internal lubrication. Featuring a 7mm bore, a 14mm outer diameter, and a 5mm width, it delivers exceptional operational stability for advanced robotics, high-speed UAV motors, and automated industrial tooling.

The 689-2RS is a precision miniature deep groove ball bearing designed for light-duty applications where space is limited and reliable performance is essential. Featuring a compact 9mm bore, 17mm outer diameter, and 5mm width, this double rubber sealed bearing is factory-lubricated and maintenance-free. It delivers smooth, quiet rotation with excellent protection against dust and moisture, making it ideal for small electric motors, 3D printers, medical devices, and office automation equipment.

The 6820-ZZ is a precision thin-section deep groove ball bearing engineered for applications where space constraints and weight reduction are critical without compromising rotational accuracy. Designed with a large bore diameter of 100mm and a remarkably slim 13mm cross-section, this bearing offers a unique solution for machinery requiring compact design and stable support. The double metal shields (ZZ) provide effective protection against particulate contamination while retaining the factory-applied grease, ensuring reliable, maintenance-free operation in precision equipment.

The 6820-2RS is a thin-section deep groove ball bearing engineered for applications demanding reliable sealing against moisture, dust, and fine particulates. With a 100 mm bore and a slim 13 mm cross-section, this bearing delivers robust radial load capacity in a compact axial footprint. The double contact rubber seals (2RS) provide superior protection for the lubricant and internal raceways, making it an ideal choice for equipment operating in contaminated or outdoor environments where long service life and minimal maintenance are essential.

With a 100 mm bore and a slim 13 mm cross-section, this open configuration eliminates the friction and speed limitations of shields or seals, allowing for higher operating speeds and direct access for oil lubrication. The 6820 Open is a thin-section deep groove ball bearing designed for applications requiring maximum rotational speed, custom lubrication strategies, or integration into assemblies with external sealing provisions. It is the preferred choice for precision spindles, high-speed machinery, and systems where the housing itself provides contamination protection.

The double contact rubber seals (2RS) provide effective exclusion of moisture, dust, and fine contaminants, making it well suited for equipment operating in moderate industrial environments where long service life and minimal maintenance are priorities. The 6819-2RS is a thin-section deep groove ball bearing engineered for applications requiring reliable sealing within a compact axial envelope. With a 95 mm bore and a slender 13 mm cross‑section, it delivers stable radial load capacity while minimizing housing width. 

The 6818-2RS is a thin-section deep groove ball bearing engineered for applications where space constraints and high radial load capacity must coexist. Featuring dual contact rubber seals (2RS), this bearing provides superior exclusion of moisture, fine dust, and contaminants, making it the preferred choice for environments demanding absolute lubricant retention. With a 90mm bore, 115mm outer diameter, and 13mm width, it is a critical component for heavy-duty industrial gearboxes, precision rotary tables, and large-format electric motors requiring stable operation under consistent loads.

The 6805-2RS is a compact, thin-section deep groove ball bearing engineered for applications demanding high rotational accuracy within tight spatial envelopes. Featuring dual contact rubber seals (2RS), this configuration provides exceptional defense against fine particulate contamination and moisture while ensuring permanent grease retention for maintenance-free operation. With a 25mm bore, 37mm outer diameter, and a slim 7mm width, it serves as a critical component for precision instrumentation, high-speed spindle assemblies, and compact electric drives where reliability and minimal friction are paramount.