This replacement pack contains 2 pcs of 2 x 7 x 3.5 mm bearings registered as Hirobo HI2500097, intended for small rotor and drivetrain roles in RC helicopters and similar models. They are compact components designed to preserve smooth rotation under light to moderate loads.
Place these bearings where shaft clearance and radial support are important, such as tail booms, small gearboxes, or control link pivots. The 602ZZ code identifies the sealed bearing family used by Hirobo; confirm compatibility with your shaft and housing dimensions before installation.
Installation guidance: press the bearing into the housing by applying force evenly to the outer race and support the assembly to avoid misalignment. Do not press on the inner race and inspect seating for proper axial alignment afterward.
Service guidance: check bearings during routine inspections for play or noise and replace both pcs together if wear is noticed to maintain smooth drivetrain operation and rotor stability.
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