RC Helicopter Bearing Collar HI2521027 by Hirobo  [HI2521027]

Compact collar for 3x6x2.5 bearings

This Hirobo collar is intended to locate and secure 3x6x2.5 mm ball bearings inside small rotating assemblies and linkages used on RC helicopters. Acting as a mechanical spacer, it helps limit axial movement where bearings sit against shafts or housings, which proves helpful during rebuilds and regular upkeep.

To fit the collar, first confirm the bearing matches the 3x6x2.5 mm dimensions stated with the product, then slide the collar into position so it bears on the race or housing face. Verify free rotation and correct axial spacing on the bench before committing to flight. Use calipers to measure inner and outer diameters plus the mating shaft or bore for a reliable fit assessment.

When used in tuning and repair tasks the collar's benefit is purely mechanical: it fixes bearing location to reduce endplay and help keep link movements consistent after maintenance.