The 3/8" shim washer is a vital piece of hardware that will allow the outer bearing race to spin freely while the inner bearing race remains stationary and vice versa.
The 3/8" shim washer is an essential piece of hardware for ensuring the long-term functionality of your machine. The shim washer fits between the bearing and large washer. This is to prevent the outer race from rubbing or getting stuck on the large washer.
The shim washer has an inner diameter of 0.39 inches (9.906 mm) and an outer diameter of 0.625 inches (15.875 mm) with a thickness of 0.063 inches (1.6002 mm).