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

RC ball bearing for helicopter parts

This Hirobo HI2500087 ball bearing is an RC-scale replacement part sized 5 x 11 x 4 mm supplied as 2 pcs and listed under general helicopter parts. It is intended for small model maintenance tasks such as replacing worn bearings in rotating assemblies and restoring smooth motion in drivetrain or rotor linkages.

Use this bearing where a compact sealed 5 x 11 x 4 mm unit is required, for example in rotor heads, tail assemblies, small gearboxes or other rotating joints on hobby helicopters and similar models. The pack contains 2 pcs to allow simultaneous replacement of paired locations or to keep a spare on hand during field maintenance.

Installation tips: confirm shaft and housing fit before pressing the bearing into place, avoid forcing the race to prevent misalignment, and use light lubrication appropriate for model applications after installation if the assembly calls for it. Check for smooth spin and minimal play as part of final setup and tuning; replacing old bearings can reduce vibration and improve control response on your RC-scale model.