Hirobo HI2500069 5 x 11 x 3 mm Open Bearing, 2 Pieces  [HI2500069]

Small open bearing for rotor assemblies

The Hirobo HI2500069 ball bearing comes as a pair of open bearings, dimensioned 5 x 11 x 3 mm for use in compact rotating assemblies found in model helicopters and similar small RC equipment.

Because these bearings are open, they allow easy relubrication and visual checks during tuning or repair. When used correctly, the bearings help maintain accurate shaft alignment and smooth rotational movement in delicate linkages and gear trains.

Workshop tips:

• Remove any debris from seating areas and deburr edges before pressing the bearing in.
• Use a driver that contacts the outer ring only to avoid stressing the rolling elements.
• Lightly lubricate with a product intended for model bearings if extra smoothness is required after installation.

Tuning and reliability notes:

Fresh HI2500069 bearings can noticeably reduce vibration and improve tracking. Always inspect adjacent gears and linkages when replacing bearings, since worn parts can mask as bearing issues.