Sealed 4mm Bore U Groove Track Roller Pulley Bearing In Stainless Steel 440C 4x20x7mm High Precision Ball Bearing For Linear Guides And Conveyor Tracks Durable Corrosion Resistant Quiet Smooth Operation

4mm Bore Sealed U-Groove Track Roller Bearing 4x20x7mm
✔️ 4x20x7 mm sealed 440C stainless U-groove pulley bearing, single pack

This sealed U-groove track roller pulley bearing is designed for smooth, low-friction motion in belt-driven and cable-guided linear systems. It fits standard U-groove tracks commonly found in compact conveyors, automation modules, and hobby CNC projects.

✅ Bore: 4 mm
✅ Outer diameter: 20 mm
✅ Width: 7 mm
✅ Material: 440C stainless steel with dual seals

💡 What is a sealed U-groove pulley bearing used for in belt-driven track systems?

Handy for guiding linear motion in compact machinery with minimal resistance.

- Used in belt tensioners and guide pulleys to reduce friction and wear
- Seal protects against dust and moisture, extending bearing life
- Fits 4x20x7 mm U-groove track rollers for compact assemblies