3x8x4 mm Ball Bearing Pair - Hirobo HI2500050  [HI2500050]

Shielded 3 x 8 x 4 mm Bearings — Pair

This RC bearing set ships as two pieces of 3 x 8 x 4 mm bearings, marked 693ZZ to show shielded construction. They work as direct replacements in helicopter general parts where the bore, outer diameter and width correspond to the original components. The shielded faces reduce entry of debris while supporting smooth rolling in low- and moderate-load positions typical of small drivetrains and rotor gear trains.

Installation guidance: measure shaft and bore tolerances prior to pressing, use a press or a soft-faced driver that contacts the outer race to avoid internal damage, do not strike the races with a hard hammer, and confirm free rotation with minimal endplay after seating. For ongoing service, inspect the shields for dirt and manually rotate the bearing to ensure smoothness.

Included: 2 pcs, 3 x 8 x 4 mm, marked 693ZZ.