Open Ball Bearing 693 3x8x4 Mm Deep Groove Chrome Steel 52100 Miniature Precision Bearing With 3 Mm Inner Diameter 8 Mm Outer Diameter 4 Mm Width Ideal For Hobby RC Models Drones Robotics And Small Machinery

This tiny open ball bearing is built for compact, precise motion in small machines. Use it in RC models, micro gear trains, 3D printers, and hobby projects where quick swaps and reliable radial support matter.

✅ Inner diameter 3 mm
✅ Outer diameter 8 mm
✅ Width 4 mm
✅ Material: 52100 chrome steel
✅ Type: open deep groove ball bearing
✅ Dynamic load rating Cr 0.55 kN
✅ Static load rating Cor 0.17 kN
✅ Maximum speed: grease 64,000 RPM; oil 76,000 RPM

💡 What is a small open ball bearing typically used for in hobby and light machinery?

It's handy for lightweight shafts where you need quick spins and easy swaps.

- Ideal for model cars, drones, 3D printers, and small gear trains

- Provides smooth radial motion with easy lubrication

- Open design allows quick inspection and maintenance

- Great for quick prototyping and educational kits