Hirobo HI2500087 Compact 5 x 11 x 4 mm Ball Bearings, 2 pcs  [HI2500087]

Precision bearing for RC helicopter maintenance

The Hirobo HI2500087 is a compact 5 x 11 x 4 mm ball bearing supplied as 2 pcs for RC helicopter upkeep. It works as a replacement unit for small rotating assemblies, helping to restore smooth motion in drivetrain parts and rotor linkages.

Fit these sealed 5 x 11 x 4 mm bearings where compact size is required, such as rotor heads, tail assemblies, micro gearboxes, or other rotating joints on hobby helicopters and similar small models. The twin-pack lets you replace paired locations at once or keep a spare for field repairs.

Installation notes: verify shaft and bore dimensions before pressing the bearing in, avoid applying excessive force that can misalign the race, and apply light model-appropriate lubrication if the assembly calls for it. Confirm smooth spin and minimal play after fitting; fresh bearings often reduce vibration and sharpen control feel.