Dual Shielded Miniature Ball Bearing 4x9x4 Millimeter With 52100 Chrome Steel, Poly Cage, Pre Lubricated Grease, Dust Protection, High Precision Micro Bearing For RC Hobby, Drones And Precision Machinery

Small 4x9x4 shielded ball bearing 684ZZ, pre-lubed
✔️ 4x9x4mm shielded chrome steel with dual ZZ shields, pre-lubed, pack 1

This tiny shielded bearing, 4x9x4 mm, is built from durable 52100 chrome steel and features double metal shields to keep dust and contaminants out. It comes pre-lubricated, making it a convenient fit for compact gear trains, mini robotics, and small precision instruments.

✅ Inner diameter: 4 mm
✅ Outer diameter: 9 mm
✅ Width: 4 mm
✅ Material: 52100 chrome steel
✅ Shielding: double metal shields (ZZ)
✅ Cage: poly
✅ Lubrication: pre-lubricated with grease
✅ Pack: 1 bearing

💡 What is a shielded miniature ball bearing used for in small mechanical systems?

- Handy for micro gear drives, RC models, and precision assemblies - Protects against dust and contaminants in tight spaces - Pre-lubricated with grease for quick setup in hobby projects