Hirobo HI2500118 3 x 6 x 2.5 mm Shielded Ball Bearings 2 pcs  [HI2500118]

Thin 3 x 6 x 2.5 mm shielded bearing for helicopter use

This listing covers a pair of 3 x 6 x 2.5 mm shielded ball bearings (63ZZ) supplied as two pcs and intended for RC-scale helicopter components. The size and shield type make them suitable for compact rotating joints where space is limited and a thin section bearing is required.

In a helicopter model these bearings are typically used in small gearboxes, rotor heads, swashplate linkages or tail assemblies where a reduced friction pivot helps preserve control precision. The 63ZZ designation indicates metal shields on both sides to limit ingress of dust while keeping the internal balls and races accessible for light lubrication and inspection.

Installation and tuning notes: confirm inner and outer bore fit before pressing the bearing into place, apply even, axial pressure when fitting, and avoid hammering on the inner race. Use minimal light oil or a compatible bearing grease if required, and check for free, smooth rotation with no noticeable play before reassembly. When replacing bearings, match both size and shield/seal type to maintain the same running characteristics.