SKF NUP322 ECJ Cylindrical Roller Bearing - 110 mm ID, 240 mm OD, 50 mm Width, Cylindrical Bore, Normal C-Clamp but they are essentially to

but they are essentially to provide a better protection and grip for your tools

The Whittet-Higgins KM-40 is a metric bearing locknut manufactured to meet and exceed the ISO 2982-2:2013(E) specification

The Whittet-Higgins BH-20 BEARHUG is a self-locking bearing locknut that threads onto a bearing-mount shaft to axially position

or both together are available

SKF NUP322 ECJ Cylindrical Roller Bearing - 110 mm ID, 240 mm OD, 50 mm Width, Cylindrical Bore, Normal C-Clamp but they are essentially toCylindrical Roller Bearing Cylindrical Roller Bearings have high radial load carrying capacity and are suitable for high speeds. The bearings are separable which facilitates mounting and dismounting. Manufactured to precision tolerance class for demanding applications. Robust steel cage construction ensures durability. Suitable for use in a wide range of industrial applications where reliability and performance are essential.