4 x 9 x 4 mm Hirobo HI2500016 Flanged Ball Bearing for Small RC Drivetrains, 2 pcs  [HI2500016]

Precision flanged bearing for small RC gearboxes

This Hirobo flanged ball bearing measures 4 x 9 x 4 mm and is supplied as a pack of two. Its flange gives a locating face to control axial movement where housing depth or collars are restricted.

As a rolling-element component, it reduces friction and keeps rotational alignment in small drivetrains and linkage points under light to moderate loads. The stated dimensions are the primary guide for compatibility and indicate it fits shafts and housings designed for 4 x 9 x 4 mm bearings.

For installation in RC assemblies ensure a clean press fit or secure retention in the bearing bore, avoid side loading of the flange, and verify the bearing spins freely before completing final assembly. Replacing worn bearings with correctly sized units restores drivetrain responsiveness and cuts parasitic drag during tuning.

Packing: Sold as 2 pcs per pack.