3mm Bore Bearing x 13.5mm U-Groove Track Roller Bearing 3x13.5x4.4mm

3mm Bore U-Groove Nylon Pulley Bearing
✨ 3mm x 13.5mm x 4.4mm - Track Roller with Built-In Steel Bearing

This U-groove track roller combines a smooth nylon pulley with a precision steel ball bearing for guided motion on rails or tracks. Ideal for sliding systems, 3D printers, and custom automation builds where light weight and quiet rolling are key.

🟢 Inner Diameter (Bore): 3mm
🟢 Outer Diameter: 13.5mm
🟢 Tire Width: 4.4mm
🟢 Pulley Material: White nylon for quiet, smooth operation
🟢 Bearing: Built-in steel ball bearing
🟢 Style: U-groove track roller bearing
🟢 Standard: Metric
🟢 Quantity: 1 bearing