Open Miniature Ball Bearing 623 3mm ID X 10mm OD X 4mm Width Chrome Steel 52100 Alloy Durable Precision Bearing For Micro Machinery Small Gearboxes RC Models Hobby Projects Low Friction High Reliability

3x10x4 mm 623 Miniature Open Ball Bearing, Single Unit
✔️ ID 3 mm, OD 10 mm, width 4 mm; open, 52100 chrome steel

This 623 miniature open ball bearing is a compact rotary element used in tiny mechanical systems where smooth rotation matters. It's commonly found in hobby robotics, model making, micro gear trains, and small CNC or 3D printer components.

✅ Inner diameter: 3 mm
✅ Outer diameter: 10 mm
✅ Width: 4 mm
✅ Material: 52100 chrome steel (high carbon chromium)
✅ Type: Open bearing (no shields)
✅ Hardness: ~60 HRC
✅ Quantity: 1 bearing

💡 What is a miniature open ball bearing used for in small mechanical assemblies?

These handy tiny bearings power smooth rotation in compact spaces. - Handy for hobby robotics and micro machines - Ideal for compact gear trains and precise motion - Chrome steel 52100 offers hardness and longevity