Open Miniature Ball Bearing 4x9x4 Mm In Chrome Steel 52100 Deep Groove Open Type For Precision Small Machinery And RC Projects With Inner Diameter 4 Mm Outer Diameter 9 Mm And Width 4 Mm
✔️ 4mm bore x 9mm OD x 4mm width; 52100 chrome steel, nylon cage
This is a small open ball bearing sized 4x9x4 mm, produced from 52100 chrome steel with a nylon cage. Open bearings are a common choice in micro-machinery, hobby robotics, RC gearboxes, and other compact precision setups where easy lubrication access and cooling are important.
✅ Size: 4 x 9 x 4 mm; open deep-groove with nylon cage
✅ ID 4 mm, OD 9 mm, width 4 mm
✅ Material: 52100 chrome steel for durability
✅ Dynamic load Cr: 640 N; Static Cor: 230 N
✅ Lubrication: grease up to 59,000 RPM; oil up to 70,000 RPM
✅ Pack size: 1 bearing
💡 What is a small open ball bearing used for in precision hobby projects? Handy, practical answer. - micro-drive assemblies for tiny gear trains and positioning stages - RC models, drones, and robotics needing smooth rotation and easy lubrication - compact gearboxes and pivots in tight spaces - lightweight, open bearing options for cooling and maintenance