Thread rolling forms threads by cold‑deforming steel, aluminum, or titanium with hardened dies. The chipless process creates strong, fatigue‑resistant threads for bolts, screws, studs, automotive and aerospace parts with high accuracy and production efficiency.
Thread rolling is a chipless cold‑forming process used to create external threads by plastically deforming material between hardened dies. Unlike cutting, rolling displaces material to form the thread profile, producing stronger surfaces with improved fatigue resistance due to work hardening and compressive residual stresses. The process is performed at room temperature on ductile materials such as carbon and alloy steels, stainless steels, aluminum, copper alloys, and titanium grades suited for cold deformation. Tooling includes flat dies, cylindrical dies, or planetary dies made from high‑speed steel and Cold Work Tool Steels or Cemented Carbide, engineered with precise thread geometry and surface treatments to endure high contact pressures. Proper lubrication, alignment, and feed settings ensure accurate pitch, flank angles, and surface finish. Thread rolling is widely used for fasteners, bolts, screws, studs, automotive drivetrain components, aerospace fittings, and medical implants, offering high production rates, excellent repeatability, and superior mechanical performance compared to cut threads.