Definitions for "Ball Bearing"
A low-friction bearing type, with rotating parts, that has an inner and an outer race which are separated by steel spheres or balls, which give it its name.
Any rolling bearing which uses balls as the friction reducing elements. There are three general types of ball bearings namely radial, thrust, and angular contact.
A very general term used to describe a deep groove ball bearing.
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Keywords:  tumbler, hotel, welded, stack, drilled
a small metal ball that goes inside the air release valve
(n.) 1. A metal ball used in the pin stack to accomplish some types of hotel or construction keying. (n.) 2. A ball, usually made of steel, used by some lock manufacturers as the bottom element in the pin stack in one or more pin chambers. (n.) 3. Any metal ball used as a tumbler's primary component. (n.) 4. Used as a means of repairing a drilled hole in a safe when welded in place. Source: Lock Industry Standards and Training (LIST) Council