Hirobo HI2500016 Flanged ball bearing 4 x 9 x 4 mm, flanged design for small RC drivetrains, sold as 2 pcs  [HI2500016]

Flanged ball bearing for RC models

This Hirobo flanged ball bearing is an RC-scale component sized 4 x 9 x 4 mm, supplied as a two-piece pack. The flange provides a locating surface to control axial movement where housings or collars are limited in depth.

As a rolling-element bearing, its role in small drivetrains and linkage points is to reduce friction and maintain rotation alignment under light to moderate loads. The stated dimension is the primary compatibility indicator — it is intended for shafts and housings designed for bearings of 4 x 9 x 4 mm.

Installation considerations for RC use include ensuring a clean press fit or retention method in the bearing bore, avoiding side loading on the flange, and verifying smooth free-spin before final assembly. In tuning contexts, replacing worn bearings with correctly sized units restores drivetrain responsiveness and reduces parasitic drag.

Packing: Sold as 2 pcs per pack.