Glossary

Billet is a solid, semi-finished piece of metal used as starting stock for further manufacturing. It is usually produced by casting, continuous casting, or hot working and then processed into finished shapes by forging, rolling, extrusion, machining, or other metalworking methods. A billet is not usually the final part; it is the raw or intermediate metal form that will be transformed into something more precise and useful.

In manufacturing, billets are commonly square, rectangular, or round in cross section. They are smaller than large slabs or blooms, but still large enough to be reheated, cut, forged, or machined into components. Steel, aluminum, brass, copper alloys, titanium, stainless steel, and other metals can all be supplied as billet depending on the application.

In fastener and industrial part production, billet material may be used to make bolts, specialty screws, studs, pins, shafts, spacers, bushings, fittings, and custom per-print parts. For example, a manufacturer may cut a section from round billet or bar stock, machine it to size, form threads, heat treat it, and finish it into a finished fastener or component. In forging operations, a billet may be heated and pressed into a die so the metal flows into the general shape of the part before machining or finishing.

The term billet is also often used to suggest a part was machined from a solid piece of metal rather than cast into its final shape. For example, “billet aluminum” usually means the part was cut or machined from solid aluminum stock. This can provide good dimensional control, consistent material properties, and a clean finished appearance, although it may produce more material waste than forming or casting methods.

A billet is different from a finished fastener because it has not yet received its final geometry, threads, tolerances, surface finish, heat treatment, or coating. It is best understood as a controlled metal starting form: solid enough to carry useful material properties, but unfinished enough to be shaped into many different products.