High-Precision Miniature Deep Groove Ball Bearing

Premium P5-grade stainless steel construction ensures smooth operation and extended service life under high-speed rotations. Ultra-thin 4x9x4mm design ideal for compact spaces in precision instruments and micro machinery.

Advanced Sealed Lubrication Technology

Pre-lubricated with high-performance grease for minimal friction and maintenance-free operation. Shielded design prevents dust contamination while retaining optimal lubricant integrity.

Versatile Industrial-Grade Applications

Perfect for dental tools, optical equipment, small motors, and robotics requiring micron-level accuracy. Heat-treated raceways withstand radial/axial loads in automation systems.

Wholesale-Optimized Bulk Supply

Factory-direct pricing for industrial buyers purchasing multiple units. Certified identical replacements for L-940ZZ/684ZZ bearings with full dimensional compatibility.

Quality Assurance Guarantee

Laser-engraved part numbers enable flawless traceability. Electropolished surfaces reduce wear particles in cleanroom environments. Vacuum-sealed individual packaging prevents corrosion.