Hirobo HI2500069 Ball Bearing 5 x 11 x 3 mm (Open Type), 2 pcs  [HI2500069]

Precision micro bearing for RC helicopters

This Hirobo HI2500069 ball bearing is supplied as a two-piece replacement set, specified as an open type with dimensions 5 x 11 x 3 mm. It is designed as a compact running element for small rotating assemblies used in model helicopters and similar lightweight RC mechanisms.

Open bearings allow direct access for inspection and relubrication, making them practical during setup or routine maintenance compared with sealed alternatives. Properly installed, the bearing reduces friction and helps maintain correct alignment between shafts and rotating components.

Installation tips:

• Clean the bore and shaft seating of any debris or burrs before pressing the bearing into position.
• Press the bearing by the outer race when fitting into a housing; avoid forcing the inner race to prevent inner-ring damage.
• Apply a light model-grade bearing lubricant after fitting if improved smoothness is required.

Impact on performance and upkeep:

Replacing worn small bearings like the HI2500069 can restore smoother rotation and reduce vibration. Inspect nearby pinions, spur gears, and linkages for wear when changing bearings, since looseness can affect gear mesh and rotor tracking.