Hirobo HI2500067 624ZZ Shielded Bearing 4 x 13 x 5 mm - 2 pcs  [HI2500067]

Replacement bearings for compact RC assemblies

This Hirobo set contains two 4 x 13 x 5 mm ball bearings, marked #624ZZ, aimed at small RC helicopter linkages and miniature drivetrain sections that need compact rolling elements.

These bearings are supplied as a general service part rather than for a single model, so measure both shaft diameter and housing bore before installation. The dimensions given correspond to inner diameter, outer diameter, and width respectively.

For installation, align the bearing and apply uniform pressure to seat it squarely. Use appropriate pullers when extracting worn bearings to avoid damage to shafts or gear faces. Upgrading worn bearings can noticeably reduce play and lower operating friction in rotor and gearbox components.