Cylindrical Roller Bearings (ZWZ/HRB/LYC)

Cylindrical roller bearings consist of three main sections:

The inner bearing race fits snugly on the turning shaft, or can actually be the shaft itself if the shaft metal is hard enough.

The outer race is a uniform and hardened collar that fits snugly inside the bearing holder bore.

Finally, there should be a sufficient number of uniform straight rollers to completely fill the space between the two races without binding together.

These bearings will last almost forever if sealed, kept very clean, and lubricated with a high film strength-bearing grease.