Bolts & Screws by Cold Heading Machine

Cold heading is widely used for producing bolts and screws because the process forms the head directly from wire while preserving material continuity and reducing unnecessary machining waste. During production, the wire is cut to a controlled blank length and transferred through several forming stages, where the material is gradually upset and shaped until the required head and shank geometry is achieved. The formed blank can then move into thread rolling or other downstream processes.

Bolt production becomes more demanding as the part length and forming complexity increase. Longer parts require stable wire feeding and accurate transfer between dies, while the relationship between the head and shank must remain well controlled throughout the forming sequence. Even small alignment errors can affect straightness or concentricity and may create problems during subsequent thread rolling.

The geometry of the finished fastener also influences how the material needs to flow inside the dies. A simple standard bolt may require a relatively straightforward forming sequence, while a part with a more complex head profile may need additional forming stages to distribute the material gradually and avoid excessive loading on the tooling. This is why the machine configuration should be selected from the actual part drawing rather than from bolt diameter alone.

For manufacturers planning dedicated bolt or screw production, BOYU's bolt cold heading machine range can be configured according to the required part length, forming sequence, material behavior, and production target. The appropriate stroke, die and blow arrangement, and transfer setup can then be matched to the application so that the machine maintains stable forming conditions during continuous production.