Hirobo HI2500074 Flanged 4 x 7 x 2 mm Ball Bearings (open) - 2 pcs  [HI2500074]

Flanged bearing solution for compact shafts

This Hirobo pair includes two open, flanged ball bearings at 4 x 7 x 2 mm intended for compact RC fittings. The flange provides a positive locating surface in shallow housings typically used on small helicopters and similar lightweight models.

Usage advice: the open design eases inspection and spot lubrication but leaves the bearing exposed to dirt. Choose mounting locations that minimise contamination and service them regularly to avoid premature wear.

Fitting pointers: press the flange into a matching seat squarely, check the inner race spins freely, and confirm there is no axial movement before final assembly. Swapping worn bearings can restore tightness in linkages and improve control fidelity.