Hirobo HI2500097 2 x 7 x 3.5mm 602ZZ Mini Ball Bearings (2 pcs) for RC Helicopters  [HI2500097]

Miniature bearings for micro helicopters

This set provides 2 pcs of 2 x 7 x 3.5 mm ball bearings listed as Hirobo HI2500097 for use in small helicopter and micro drivetrain assemblies. They serve as compact replacement bearings where low friction and precise rotation are needed in tight housings.

Ideal locations include tail rotor shafts, compact gear trains, and pivot points where radial support and shaft clearance are critical. The 602ZZ marking refers to the sealed series used by Hirobo, so double check bore and shaft dimensions before fitting.

Installation tip: press the outer race into a clean, supported housing using steady, even force and avoid transmitting force through the inner race. After seating, confirm axial alignment and run a quick rotation check.

Maintenance advice: monitor for increased play, roughness, or unusual noise and replace the pair when wear appears to keep rotor balance and drivetrain smoothness.