Toprecision — Precision Fastening & Connection Solutions

Two screws with identical geometry can differ 20–50% in fatigue life depending on how their threads were made. The difference is cold work.

Bottom line: for most Thread Inserts applications the decision comes down to load, environment and assembly method — the Thread Inserts guide walks through the selection.

What rolling does

Thread rolling presses hardened dies against the blank, displacing material into the thread form. Nothing is removed: grains flow along the flank contours, the surface work-hardens, and compressive residual stress develops in the root — precisely where fatigue cracks start. Cut threads, by contrast, sever grains and leave tensile stress and tool marks at the root.

The measurable consequences

• Fatigue strength: rolled threads routinely beat cut ones by wide margins in repeated-load tests.
• Surface finish: rolling leaves smooth flanks — better friction consistency, better torque control.
• Material economy: no chips, faster cycle, cheaper per piece at volume.

When cutting still wins

Very small batches, oversized diameters beyond rolling-machine capacity, and some hard or exotic materials cut more practically than they roll. Blind-hole internal threads below certain sizes are cut because rolling taps cannot handle them. Topprecision rolls threads as standard on its production screws — including its 7-series aluminum bolt line, where the root's compressive layer is a key fatigue asset — and cuts only where volume or geometry demands.

Key specifications at a glance

Need fastener engineering support?

Toprecision manufactures precision fasteners in-house — send the drawing, service environment and annual volume. We will recommend the material, grade, coating and process that match the joint requirement. Request a fastener consult.