693, 693Z, 693ZZ, 693RS, 693-2RS Miniature Ball Bearings 3x8x4mm – Compact Deep Groove Bearings for High-Speed Precision Applications

693, 693Z, 693ZZ, 693RS, 693-2RS Miniature Ball Bearings 3x8x4mm – Compact Deep Groove Bearings for High-Speed Precision Applications

Ultra-compact 693 series miniature deep groove ball bearings in size 3mm (ID) × 8mm (OD) × 4mm (W), engineered for precision devices and small-scale mechanical systems requiring smooth, quiet, and high-speed rotation under light radial loads. Available in multiple sealing options to suit various operating environments:

• 693: Open type – ideal for clean, controlled settings or custom lubrication
• 693Z / 693ZZ (693-2Z): Single or double metal shields – protect against dust while retaining factory grease
• 693RS / 693-2RS: Single or double rubber seals – offer superior resistance to moisture and fine contaminants

Made from high-quality stainless steel or chrome steel (GCr15) with precision-ground raceways, these miniature bearings deliver low friction, minimal vibration, and consistent performance at high RPMs. Commonly used in small electric motors, drones, RC models, medical instruments, office equipment, robotics, 3D printers, and precision gear systems.

Most sealed variants are pre-lubricated with specialized low-torque grease for maintenance-free operation. The 693 series supports both radial and limited axial loads, making it a versatile choice for compact, high-efficiency designs.

🔧 Key Specifications:

• Models: 693, 693Z, 693ZZ (693-2Z), 693RS, 693-2RS
• Dimensions: 3 × 8 × 4 mm
• Material: Chrome Steel (GCr15) or Stainless Steel (optional)
• Precision Rating: ABEC-1 to ABEC-5 (depending on grade)
• Ideal for: Mini motors, hobby electronics, medical devices, and precision automation