Ball bearings are a type of rolling-element bearing that uses small spherical balls to maintain separation between moving parts. Their primary purpose is to reduce rotational friction and support radial and axial loads.

Stainless steel bearings are a type of rolling-element bearing made from corrosion-resistant stainless steel, rather than standard chrome steel. They are designed to operate reliably in environments where moisture, chemicals, or washdowns would quickly degrade conventional bearings.

Ball bearings are widely used in applications ranging from electric motors, fans, and hard drives to bicycles, automotive wheels, and industrial machinery. They are valued for their durability, low maintenance, and ability to handle both radial (perpendicular to the shaft) and thrust (parallel to the shaft) loads, though deep-groove ball bearings are best suited for combined loads.

Common materials include chrome steel, stainless steel, and ceramic. Sealed or shielded versions offer protection against dust, dirt, and moisture.