McMaster 6384K77 Steel Ball Bearing, Sealed, Trade No. 3028-2RS, for 5/8" Shaft Diameter, 1300 lb

Smoother than smooth—the balls inside these bearings roll nearly friction-free. You’ll often find them on rapidly rotating parts, from the whirring chuck on a power drill to the spinning shaft on an electric motor.

Sealed — The best choice for dirty environments. A barrier seals out dust so it won't gunk up or wear down the balls. However, these bearings retain the most heat since air can't flow through.

Steel — Strong and wear resistant. However, these bearings are best for dry environments since moisture will cause them to rust.