The bearing is encased in rubber for reduced vibration and noise, and it has an extended inner ring on one side for extra shaft support. This bearing cartridge unit is suitable for applications including conveyors, ventilating equipment, and heating and air conditioning equipment, among others.Cartridges. Our cartridges are available in metallic or rubber. The bearing inserts have grade 10 balls and super-finished ball paths to support proper lube film and reduce noise. Metallic Design Attributes. Mounts in straight bore housings. Comes complete with wide inner-ring bearing insert and three-piece “R” seal. 

An old-style cup-and-cone bottom bracket.The lockring wrench is about to loosen the lockring, the pin wrench is engaging two of the holes in the adjustable cup.(Some cartridge bearings do use these same tools.) Another article gives instructions on servicing cup-and-cone bottom brackets.: A cartridge bottom bracket. The splined tool is shown above the bottom bracket.