Hirobo HI2500120 ball bearing 7 x 11 x 3 mm 2 pcs for RC helicopter components  [HI2500120]

Replacement 7 x 11 x 3 mm bearings

This is a pair of 7 x 11 x 3 mm ball bearings supplied as a 2 pcs pack intended for RC-scale use in helicopter and small model component assemblies. The bearing size and count are called out to match common small bearing seats found in rotor heads, swash linkages, tail assemblies, and compact drivetrain locations where similar dimensions are specified.

Installation notes: verify fit in the bearing bore before final assembly, press the bearing squarely into the hub or carrier to avoid misalignment, and check for endplay or binding after seating. If reusing housings, clean mating surfaces and remove debris that could affect alignment.

Tuning and maintenance role: these bearings serve as low‑profile rotary supports that help maintain smooth rotation and consistent control response when properly fitted; inspect periodically for roughness or play and replace bearings in matched pairs when wear is detected.