Shielded 684ZZ Miniature Ball Bearings 4x9x4mm 10 Pack With Dual Metal Shields Pre Lubricated Chrome Steel For Dust Protection And Smooth Operation Ideal For RC Models And Precision Gear

10-Pack 684ZZ Shielded Ball Bearings 4x9x4mm Set
✔️ 4x9x4 mm shielded chrome steel bearings, 10-pack, pre-lubed

The 684ZZ shielded ball bearing is a compact, high-precision unit used in small hobby gear, RC cars, drones, and model kits. Its double metal shields guard against dust and contaminants, while pre-lubricated grease ensures smooth, ready-to-run operation in tight spaces.

✅ Size: 4x9x4 mm (ID 4 mm, OD 9 mm, width 4 mm)
✅ Shielding: double metal shields (ZZ) for dust protection
✅ Material: chrome steel for durability
✅ Lubrication: pre-lubed grease for smooth operation
✅ Dynamic load: Cr 640 N; Static load: Cor 230 N
✅ Speed: up to 59,000 RPM
✅ Pack: 10 bearings per pack
✅ Applications: fits Kyosho, KOYO W684ZZ, NSK 684ZZ, NMB L-940ZZ in RC and model gear sets

💡 What is a shielded 4x9x4 mm ball bearing used for in hobby RC and small machines?

Shielded bearings are handy for compact setups where dust protection and smooth rotation matter. - Handy for RC cars, drones, and small machinery - Keeps dirt out while grease remains in - Ready-to-use in hobby kits with pre-lubed grease - Great for stocking up with a 10-pack