Open Ball Bearing 15mm By 21mm By 4mm Chrome Steel 52100 Durable High Precision Bearing For Industrial Equipment And General Purpose Applications Suitable For Machinery And Equipment In Industrial Automotive Robotic And Conveyor Systems

15x21x4 Open Ball Bearing, Single 52100 Chrome Steel
✔️ ID 15mm, OD 21mm, width 4mm; chrome steel 52100, 1 pc

This open ball bearing measures 15x21x4 mm and is made from 52100 chrome steel. It’s a standard size used across many machines, from hobby projects to light industrial gear assemblies, where easy mounting and regular lubrication matter.

✅ Inner diameter 15 mm
✅ Outer diameter 21 mm
✅ Width 4 mm
✅ Material: 52100 chrome steel, open deep groove

💡 What is an open ball bearing typically used for in small machinery?

It's handy for compact projects needing smooth rotation and easy lubrication.

- handy for hobby robotics, small machinery, DIY projects
- supports radial loads with simple lubrication
- pairs with standard shafts and housings
- ensures proper lubrication and clearance for longer life