688, 688Z, 688ZZ, 688RS, 688-2RS Ball Bearings 8x16x5mm – Ultra-Miniature Deep Groove Ball Bearings for High-Speed & Precision Micro Mechanical Systems

688, 688Z, 688ZZ, 688RS, 688-2RS Ball Bearings 8x16x5mm – Ultra-Miniature Deep Groove Ball Bearings for High-Speed & Precision Micro Mechanical Systems

Ultra-compact 688 series deep groove ball bearings in size 8mm (ID) × 16mm (OD) × 5mm (W), engineered for micro-mechanical and precision applications where space is limited but smooth, quiet, and high-speed rotation is essential. Available in multiple sealing configurations to suit diverse operating conditions:

• 688: Open type – ideal for clean environments or custom lubrication
• 688Z / 688ZZ (688-2Z): Single or double metal shields – protect against dust while retaining lubricant
• 688RS / 688-2RS: Single or double rubber seals – offer superior resistance to moisture, dirt, and contaminants

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

Most sealed models are pre-lubricated with high-performance grease for maintenance-free operation. The 688 series supports both radial and limited axial loads, making it ideal for compact, high-RPM systems requiring reliability, quietness, and long service life.

🔧 Key Specifications:

• Models: 688, 688Z, 688ZZ (688-2Z), 688RS, 688-2RS
• Dimensions: 8 × 16 × 5 mm
• Material: Chrome Steel (GCr15)
• Precision Rating: ABEC-1 (ISO P0)
• Ideal for: Medical devices, micro-electronics, robotics, and precision micro-mechanisms