13x20x4 Sealed Ball Bearing With One End Sealed And The Other Shielded In Durable 52100 Chrome Alloy Steel 13mm X 20mm X 4mm Miniature Bearing For Industrial Machinery And Hobby Projects

Compact 13x20x4 Sealed Ball Bearing in Chrome Steel
✔️ 13 mm bore, 20 mm outer, 4 mm width; sealed, shielded, 1 bearing

13x20x4 miniature sealed bearing is a compact chrome steel bearing designed for small shafts in hobby machines, RC models, 3D printers, and precision gear assemblies. This sealed/shielded combination protects lubrication and blocks dust in tight spaces, making it ideal for compact linear slide units and precise rotational tasks. Chrome steel 52100 offers strength and durability; ceramic variants exist in other models if you need lighter, higher-speed performance.

✅ Inner Diameter: 13 mm
✅ Outer Diameter: 20 mm
✅ Width: 4 mm
✅ Material: Chrome steel (52100)
✅ Seal / Shield: One side sealed, other side shielded
✅ Quantity: 1 bearing

💡 What is a sealed ball bearing used for in small mechanical assemblies? This handy guide explains where a bearing like this fits and why the seal and shield matter.

- Reduces friction and wear on rotating shafts in tight spaces - Keeps lubricant in and contaminants out for longer life - Fits compact setups like hobby robotics, printers, and model gear trains - Helps achieve smooth, reliable motion in limited-clearance applications