Hirobo HI2500050 Ball Bearing 3x8x4 mm, 2 pcs  [HI2500050]

3x8x4 mm Ball Bearing, 2 pcs

This RC-scale ball bearing set is supplied as two pcs of 3 x 8 x 4 mm bearings, marked 693ZZ for shielded construction. Designed for use in helicopter general parts, the bearings serve as straightforward replacements where the specified bore, outer diameter and width match existing hubs or gear carriers. The compact size and shielded faces help keep debris out while maintaining smooth rotation in low- to moderate-load locations typical of small drivetrain and rotor assemblies.

Installation tips: verify the shaft/bore tolerance before press-fitting, seat the bearing squarely using a soft driver or bearing press, avoid hammer strikes directly on the race, and check for free rotation and minimal endplay before final assembly. For maintenance and tuning, inspect the shields for contamination and rotate the bearing by hand after installation to confirm smooth operation.

Included: 2 pcs, 3 x 8 x 4 mm, marked 693ZZ.