Hirobo HI2500067 624ZZ Ball Bearing 4 x 13 x 5 mm, Pack of 2  [HI2500067]

Compact ball bearings for model helicopter linkages

This Hirobo replacement comprises two 4 x 13 x 5 mm ball bearings, listed with the #624ZZ marking. They are intended for small RC helicopter rotating linkages and compact drivetrain subassemblies where minimal footprint bearings are required.

The bearings are supplied as generic service parts, so check the shaft diameter and housing bore to confirm the 4 x 13 x 5 mm inner, outer, and width dimensions match your assembly before fitting.

Fit bearings with controlled pressure, avoiding off-axis loads, and keep contact surfaces clean. Use proper pullers to remove old bearings to protect shafts and gear faces. Installing fresh bearings reduces mechanical play and lowers friction, aiding consistent rotor and gearbox operation.