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

Compact 6x12x4 bearing for model helicopters

This Hirobo HI2500046 ball bearing is an RC-scale replacement part supplied as a 2-piece set for routine helicopter maintenance. It is designed as a compact, dimensionally accurate component to provide smooth rotary motion and low friction on small shafts, pinions, and gearbox interfaces in model helicopters.

In practical use these bearings reduce rotational drag at bearing seats, carry axial and radial loads in typical helicopter linkages, and help maintain consistent rotor and gear mesh performance. When installed correctly they contribute to predictable servo response and drivetrain behavior during setup and tuning.

Installation notes: verify shaft diameter and bearing seat clearance before pressing the bearing in, use a correct bearing press tool or apply even, controlled force, avoid hammering directly on the race, and follow your helicopter's service manual when checking endplay and preload. Use light, appropriate lubrication and inspect regularly for wear or corrosion to extend service life.

Tuning and maintenance tips: replace bearings in matched pairs when wear is obvious to preserve drivetrain balance, listen for noise or roughness under rotation as early signs of failure, and keep lubricants clean to prevent contaminant abrasion. For tight gear tolerances, a correctly seated bearing with minimal axial play improves repeatability during setup.