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

Pair of 3 x 8 x 4 mm Shielded Bearings

This RC-scale ball bearing set is supplied as two pcs of 3 x 8 x 4 mm bearings, marked 693ZZ to denote shielded construction. Intended for general helicopter parts, these bearings act as straightforward replacements when bore, outer diameter and width match hubs or gear carriers. The compact form and shielded faces help exclude debris while keeping rotation smooth in low- to moderate-load locations common to small drivetrain and rotor assemblies.

Installation tips: confirm shaft and bore tolerance before press-fitting, use a bearing press or soft-faced driver to seat the outer race squarely, avoid direct hammer impacts on the races, and verify free spin and minimal endplay prior to final assembly. For upkeep, check the shields for dirt and rotate the bearing by hand after fitment to ensure even movement.

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