689, 689Z, 689ZZ, 689RS, 689-2RS Ball Bearings 9x17x5mm – Ultra-Miniature Deep Groove Ball Bearings for High-Speed & Precision Micro Mechanical Systems

689, 689Z, 689ZZ, 689RS, 689-2RS Ball Bearings 9x17x5mm – Ultra-Miniature Deep Groove Ball Bearings for High-Speed & Precision Micro Mechanical Systems

Ultra-compact 689 series deep groove ball bearings in size 9mm (ID) × 17mm (OD) × 5mm (W), designed for micro-mechanical and precision applications where space is limited but smooth, quiet, and high-speed rotation is critical. Available in multiple sealing configurations to suit diverse operating environments:

• 689: Open type – ideal for cleanroom conditions or custom lubrication
• 689Z / 689ZZ (689-2Z): Single or double metal shields – protect against fine dust while retaining lubricant
• 689RS / 689-2RS: Single or double rubber seals – provide excellent resistance to moisture, dirt, and contaminants

Manufactured from high-grade chrome steel (GCr15), these micro bearings feature precision-ground raceways for low-friction, low-noise performance under light radial loads. Widely used in miniature motors, dental handpieces, surgical instruments, micro drones, robotics joints, smart wearables, cooling fans, lab automation, and precision instrumentation.

Most sealed models are pre-lubricated with high-performance grease for maintenance-free operation. The 689 series supports both radial and limited axial loads, making it perfect for compact, high-RPM systems requiring reliability and long service life.

🔧 Key Specifications:

• Models: 689, 689Z, 689ZZ (689-2Z), 689RS, 689-2RS
• Dimensions: 9 × 17 × 5 mm
• Material: Chrome Steel (GCr15)
• Precision Rating: ABEC-1 (ISO P0)
• Ideal for: Medical micro-tools, micro-electronics, robotics, and precision micro-mechanisms