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

7 x 11 x 3 mm Precision Replacement Bearings

These two 7 x 11 x 3 mm ball bearings are supplied as a 2 pcs pack intended for RC helicopter use and other small model component assemblies. The stated size and quantity match common small bearing seats found in rotor heads, swash linkages, tail gear, and compact drivetrain locations that accept this diameter and thickness.

Installation advice: confirm the bearing seat dimensions before final assembly, press the bearing square and evenly into the hub or carrier to avoid tilt, and verify there is no endplay or binding after seating. When reusing housings, clean mating surfaces and remove debris that could affect alignment.

Maintenance and tuning role: these low profile bearings provide rotary support to keep rotation smooth and preserve consistent control response when correctly fitted; inspect them periodically for roughness or play and replace worn bearings in matched pairs.