Hirobo HI2500117 Ball Bearing 2 x 5 x 2.5 mm ball bearing part  [HI2500117]

Ball Bearing for Hirobo Helicopter Parts

This HI2500117 item is an RC-scale ball bearing sold as a small spare for helicopter general parts, supplied in a pack of 2 pcs and identified by part code #52ZZ. It is intended for replacement of worn bearings in small rotating assemblies where compact dimensions are required.

Functionally, these bearings support rotating shafts and reduce friction between mating parts in rotor linkages and transmission shafts. In maintenance or repair, replacing a single worn bearing with an identical unit helps restore smooth rotation and reduce vibration from play or roughness.

Installation notes: verify shaft diameter and fit before pressing bearings into housings, ensure the bearing sits squarely on the journal, and check for endplay and radial runout after fitment. Avoid forcing a bearing onto a stamped or damaged shaft without proper preparation, and inspect mating components for wear that could shorten the bearing service 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.