684 Deep Groove Ball Bearing (ZrO₂): Precision Ceramic Solution for Miniature Applications

The 684 Deep Groove Ball Bearing (ZrO₂) is a precision miniature full ceramic bearing with metric dimensions of 4mm inner diameter, 9mm outer diameter, and 2.5mm or 4mm width (open or sealed configurations respectively). Manufactured entirely from Zirconium Oxide (ZrO₂) ceramic for both rings and balls, this bearing delivers superior wear resistance, complete corrosion protection, and excellent thermal stability for demanding applications where conventional steel bearings cannot perform reliably.

For procurement managers and design engineers, this bearing offers a strategic component choice to enhance equipment reliability, reduce maintenance requirements, and ensure consistent performance in space-constrained and environmentally challenging applications.

Product Advantages

Operational Reliability: The deep groove design accommodates both radial and axial loads while maintaining precise rotational accuracy. Full ceramic construction with high-precision G5 balls ensures consistent performance throughout extended service life, with full ceramic bearings lasting up to approximately 10 times longer than typical steel bearings.

Cost Efficiency: ZrO₂ ceramic balls are significantly lighter than steel, reducing centrifugal forces and energy consumption during high-speed operation. Self-lubricating properties minimize or eliminate lubrication requirements, reducing ongoing maintenance costs.

Risk Mitigation: ZrO₂ ceramic provides complete resistance to corrosion, chemicals (except hydrofluoric acid and hot concentrated sulfuric acid), and moisture, maintaining dimensional stability in harsh environments. Non-magnetic and electrically insulating properties prevent damage from stray currents, electrical discharge damage, and magnetic interference.

Compatibility & Flexibility: Available in open, shielded, or sealed configurations with PTFE seals. Various cage options including PEEK, PTFE, or full complement designs for seamless integration into existing applications.

Quality Assurance: Manufactured with precision tolerances (ABEC-1 grade) ensuring consistent quality and performance, with inner diameter tolerance of -0.008mm to 0.

Technical Specifications