Hirobo HI2500046 6x12x4 mm Ball Bearing Set 2 pcs  [HI2500046]

Precision 6x12x4 bearing for model rotorcraft

The Hirobo HI2500046 ball bearing is offered as a 2-piece replacement set intended for general parts maintenance on RC helicopters. This small bearing delivers the dimensional accuracy needed where low friction and reliable rotation are required on shafts and gearbox pins.

Functionally these bearings lower rotational drag at seating points, sustain axial and radial loads found in typical helicopter linkages, and assist in keeping gear and rotor mesh stable. Correct seating contributes to consistent control response and drivetrain predictability during tuning and flight checks.

Installation notes: check shaft tolerance and seating clearance before installation, employ a bearing press or similar tool to press the bearing in evenly, do not hammer the race, and verify endplay and preload following the model service instructions. Apply light lubricant suited to the application and perform regular inspections to prevent corrosion and premature wear.

Maintenance advice: change bearings as a matched pair if wear is visible to retain balance, monitor for unusual noise or rough rotation as early indicators of failure, and keep lubricants free of debris to avoid abrasive damage. Properly seated bearings with minimal axial play help achieve repeatable gear setups.