King Engine Bearings develops and manufactures engine bearings for automobiles, light-duty to heavy-duty trucks, marine and aviation applications, standby power, and other types of internal combustion engines.The company focuses almost exclusively on engine bearings.

The King line includes OEM replacement rod bearings, main bearings, cam bearings, thrust washers, and other high-performance bearings.

King has also developed products such as ElliptiX, an oil slot/oil hole hybrid that improves oil ingress, and U-Groove, a 90-degree oil groove shape to increase bearing load capacity by expanding the surface area.