Release time：2020-01-16 18:44 Browse：
The maximum length of cold heading (cold forming) long screws is generally limited by the stroke of the machine and the way the material is fed. Typically:
Single or two-die cold heading machines can produce screws up to 150mm - 200mm long.
Multi-station machines (4-die, 6-die, etc.) with extended feeding systems can reach 250mm - 300mm.
Special open-die long-stroke cold heading machines (like the one in your factory) can achieve lengths of up to 450mm or more, but this requires special tooling and careful control of straightness, lubrication, and cooling.
However, the longer the screw, the higher the technical requirements on equipment and tooling, and it becomes more difficult to maintain forming precision and concentricity.
If the required length exceeds the capability of cold heading, alternative methods such as CNC machining, thread rolling, or welding assemblies may be necessary.
Would you like me to create a visual chart of the “Maximum Capabilities of Cold Heading for Long Screws”? It can be helpful when explaining to clients.
