Hirobo HI2500086 Micro Ball Bearings 3 x 7 x 3 mm, 2 pcs  [HI2500086]

Micro bearings for small RC models

These compact hobby bearings are supplied as two pcs of 3 x 7 x 3 mm units, intended for use in small helicopter and model assemblies. They serve as replacement hobby parts designed to reduce friction at rotating joints and to support miniature drivetrain and rotor linkages.

Practical notes for hobby use:

• Size and count: the package contains 2 pcs of 3 x 7 x 3 mm bearings, referenced by model number HI2500086.
• Installation tips: press the bearing into a clean, properly sized bore using a soft driver on the outer race to avoid race damage; avoid direct hammer blows and confirm shaft fit for play before final assembly.
• Maintenance: check bearings for smooth rotation and contamination, replace if roughness or play appears, and follow your model's recommended lubrication practice after confirming whether the bearing is open, shielded, or sealed.
• Tuning benefit: fitting low-friction bearings like these can reduce unwanted drag and play, helping achieve crisper cyclic response and steadier tail or drivetrain behavior on micro helicopters and light models.