Chucking lug

A lug or bossA relatively short protrusion or projection on the surface of a forging, often cylindrical in shape. to the forgingThe process of working metal to a desired shape by impact or pressure in hammers, forging machines (upsetters), presses, rolls, and related forming equipment. so that “on center” machining and forming can be performed with one setting or chucking; this lug is machined or cut away on the finished item.