NTN UC318 Insert Bearing 90x190x49mm electrician tool

NTN UC318 Insert Bearing

The NTN UC318 is a new insert bearing built for electrician tools and compatible power-tool assemblies. It suits maintenance teams and workshops that need a direct-fit replacement for worn units. The 90x190x49mm envelope matches the original mounting pattern without modification.

Replacing worn UC318 units

Swap this bearing when the original shows excess play, noise or heat under load. The jump is worth it when the tool spindle runs on a 90 mm shaft and the housing accepts a 190 mm outer diameter with a 49 mm width. It restores smooth rotation without changing the tool design.

Dimensional limits of the UC318

The bearing fits only shafts of 90 mm and housings bored to 190 mm with 49 mm of axial room. It cannot serve applications that need a larger bore, a smaller outer diameter or a different width. First listed by the manufacturer in 2026, it carries no integrated seals or locking collars beyond the standard UC318 geometry.