9x17x4 Open Deep Groove Ball Bearing For RC Cars And Trucks 9mm Bore 17mm Outer Diameter 4mm Width Chrome Steel 52100 Alloy Open Bearing Designed For High Precision Durable Performance In Hobby And Industrial Projects

This compact bearing size is a go-to choice for RC cars, trucks, and micromachinery where compact, smooth rotation matters. Open designs make lubrication easy in hobby builds and small automation projects.

✅ Size: 9 mm bore x 17 mm outer diameter x 4 mm width
✅ Open design (no shields) for easy lubrication and cooling
✅ Material: 52100 chrome steel for durability
✅ Dynamic load rating Cr: 1350 N
✅ Static load rating Cor: 660 N
✅ Max speeds: grease up to 39,000 RPM; oil up to 46,000 RPM
✅ Quantity: 1 bearing

💡 What is a ball bearing used for in hobby RC and small machinery? Ball bearings reduce friction and wear in rotating parts, enabling smoother motion and longer life in compact assemblies. - Handy for lightweight axles, hubs, and gear trains in RC setups - Common choice for open-frame designs where shields aren’t required - Works well in small automation, drones, and precision hobby projects