Thread Rolling

Roll threading cold-forms threads by displacing metal through die pressure, creating stronger fasteners with continuous grain flow and zero waste.

Roll threading is a cold-forming manufacturing process that creates threads by displacing material from a workpiece rather than removing it. In this process, a blank that is typically a starting diameter between the final major and minor diameters of the final thread form is compressed between rotating or reciprocating dies that have the inverse profile of the desired thread. This physically deforms the metal, causing its grain structure to flow along the contours of the thread.

The key advantages of roll threading include significantly increased tensile and fatigue strength due to work hardening and continuous grain flow, a superior surface finish, and improved dimensional accuracy.

Additionally, it is a highly efficient and cost-effective process that produces no material waste and allows for high production rates compared to traditional thread-cutting methods.

The Thread Rolling process offers:

• High production rate
• No material wastage
• Uniform threads
• Improved physical characteristics
• Greater accuracy
• High level of surface finish

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Tensile and Shear Strength

Thread rolling is a cold-forming process and therefore increases the tensile strength.

When compared to screw threading, a process that breaks grain flow (see figure 1), the advantages are immediately clear. The roll threading process manipulates the grain flow, re-forming it in continuous unbroken lines following the contours of the threads (see figure 2).

As a result, shear strength is vastly improved and threads resist ‘stripping’ when in situ because any failures must occur across the diameter rather than with the grain.

Please contact us today to discuss your roll threading requirements.
We can fully manufacture your standard and special fasteners at our factory in the UK.