Hirobo HI2500117 Ball Bearing 2 x 5 x 2.5 mm 2 pc  [HI2500117]

Compact Ball Bearing for Hirobo Helicopter Parts

This HI2500117 bearing is an RC-scale spare offered as a pack of 2 pcs and listed under part code #52ZZ. It is intended to replace worn bearings in small rotating assemblies where the 2 x 5 x 2.5 mm size is required.

Functionally, these bearings support rotating shafts and reduce friction between mating parts in rotor linkages and small transmission shafts. Replacing a single degraded bearing with an identical unit helps restore smooth rotation and reduce vibration caused by play or rough surfaces.

Installation notes: confirm shaft diameter and fit before pressing the bearings into housings, ensure the bearing seats squarely on the journal, and check for endplay and radial runout after fitment. Avoid forcing a bearing onto a damaged or improperly prepared shaft, and inspect mating components for wear that could shorten bearing life.

Compatibility: this item is listed under Hirobo helicopter general parts and is intended for use where a 2 x 5 x 2.5 mm bearing specified by HI2500117 or #52ZZ is required.