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

Replacement bearing for small model rotating joints

The Hirobo HI2500087 is a 5 x 11 x 4 mm ball bearing sold in a pair for use in hobby helicopter parts and similar small models. It serves as a direct replacement option for compact rotating joints where a sealed bearing is required.

These 5 x 11 x 4 mm bearings are suitable for rotor heads, tail linkages, micro gearboxes, and other tight-clearance rotating mounts on RC helicopters and comparable models. The twin-pack allows replacing matched locations or keeping a spare for maintenance needs.

Compatibility advice: check both the shaft diameter and housing bore to confirm a 5 mm inner diameter, 11 mm outer diameter, and 4 mm width before installation. Press the bearing in squarely, avoid race distortion, and verify smooth rotation and minimal play once fitted to maintain safe, reliable operation.