CNC Thread Machining

Covering standard fastening threads through to large-pitch power transmission screws, these threaded components are produced via single-point CNC threading or high-speed thread whirling. Applications include high-pressure oil and gas manifold fittings, aerospace vibration-resistant structural bolts, machine tool leadscrews, and industrial fluid connectors. They maintain mechanical clamping force and fluid containment under heavy vibration, pressure spikes, and repeated makeup cycles.

Fluid fittings and power transmission threads require accurate flank contact and root radii, as pitch errors can lead to uneven load sharing and thread stripping. Machining systems synchronize spindle rotation with feed-axis motion, maintaining thread pitch, tooth profile, and lead angles on metric, ACME, and multi-start trapezoidal threads. Generous root radii are maintained to distribute stress and resist cyclic shear loads.

When threading tough materials such as high-strength stainless or nickel alloys, custom micro-grain carbide threading inserts with integrated chipbreakers are used to form the thread profile while deburring crests and roots. CNC software compensates for leadscrew pitch variations over extended travels, reducing cumulative pitch error over long thread engagements and preventing binding during assembly.

Threads are checked at the machine with calibrated Go and No-Go thread plug or ring gauges to verify pitch diameter, lead, and flank angle compliance. For critical applications, optical comparators and Hexagon CMMs trace thread profiles to evaluate flank angles, root radii, and pitch accuracy. External threads are fitted with plastic mesh sleeves, and internal threads are capped before packing in heavy-duty shipping cartons.