Replacement 4 x 8 x 8 mm Roller Bearing for RC Shafts Hirobo HI2500017  [HI2500017]

Precision 4 x 8 x 8 mm roller bearing

This Hirobo HI2500017 roller bearing is an RC-scale spare supplied as a pair, intended for compact rotating parts in model assemblies. Two pieces are included to allow matched replacement and simple service intervals.

Practically, the bearing reduces friction at low to moderate RPM and assists in preserving shaft alignment; installers generally remove the old bearing, verify the housing bore and shaft tolerances, then press the new unit squarely onto the shaft using steady, even pressure or a dedicated bearing press.

For tuning and maintenance check seating depth and axial play after installation, apply a light model-grade lubricant sparingly if needed, and monitor periodically for wear or looseness that can degrade drivetrain smoothness. This product is described for model-scale use only and not for full-size applications.