Cold Heading Services: High-Volume Fasteners and Precision Formed Parts

If your part is a fastener, a stud, a rivet, or anything with a formed head and a uniform shank, cold heading services will almost always beat machining on cost and speed. Cold heading squeezes wire stock between dies at room temperature to displace metal into shape—no chips, near-net geometry, and cycle times measured in fractions of a second. For quantities in the tens of thousands and up, it is the standard way the world makes bolts, and the material savings alone often pay for the tooling on the first production lot. The process also improves mechanical properties by aligning grain flow along the part’s contour.

What Cold Heading Is

A cold header feeds calibrated wire, crops a slug, and upsets it through one or more stations—each blow forms more of the shape. Headed blanks then move to thread rolling, trimming, or secondary machining. The “cold” part matters: work hardening strengthens the part, and since nothing is removed, material yield approaches 100%. Compare that with cold forging, a broader family that includes heading plus more complex net-shape forming such as shoulders, collars, and pierced features that a simple header cannot reach in one pass.

The Cold Heading Process

Multi-die, multi-blow headers produce everything from simple hex bolts to stepped shoulders and off-axis features. Progressive tooling lets a single machine build complexity station by station, so a part that would need five operations if machined needs five die stations instead—at thousands of parts per hour. For the heaviest blanks, hot forging may precede heading to pre-shape larger diameters, but cold heading still finishes the precision features and the head geometry that defines the fastener.

Materials and Wire Grades

Low-carbon steels (1018, 1022), alloy steels (4032, 4140), and stainless (302, 304, 316) head reliably. Free-machining grades help when a secondary CNC turning or Swiss turning operation trims a feature the header cannot form, such as a cross-drilled hole or a reduced-diameter neck. Wire must be clean and consistent—diameter and surface finish drive defect rates, and a single out-of-tolerance coil can wreck a production run before anyone notices.

Cold Heading vs Machining

Machining a fastener from bar wastes 40–60% of the material and is slow; cold heading uses nearly all the wire and runs thousands per hour. Use machining for low volumes, exotic alloys, or geometries heading cannot reach—our custom metal fasteners guide covers when each method wins. For the threads themselves, thread rolling services form stronger threads than cutting and pair naturally with heading, since both displace rather than remove metal and both leave a work-hardened, fatigue-resistant surface.

Trimming, Threading, and Plating

After heading, flash is trimmed, threads are rolled, and the part is heat treated for strength. Final protection is often zinc plating or another coating specified by the application and by salt-spray requirements. Because cold heading work-hardens the steel, heat treatment may be needed to restore ductility in some zones, especially near the head where upsetting is most severe. Plating thickness must be controlled on threaded sections so go/no-go gauges still pass after finishing.

Volume and Tooling

Tooling is the upfront cost: dies and punches are custom, so cold heading pays off above a threshold volume (often a few thousand pieces). Below that, screw machining or turned blanks are more economical. A good supplier helps you find the crossover honestly, because recommending a process you do not yet have volume for just adds cost you will feel on every PO.

Design Tips That Cut Headed-Part Cost

Headed parts are cheap to make and expensive to redesign, so a little up-front discipline pays back across every production lot. Keep head diameters within roughly 2.5 times the wire diameter; beyond that the upset requires extra stations and risks folding or laps at the head fillet. Avoid thin, tall heads that cannot be formed cleanly in one blow, and steer clear of features that need a separate machining operation unless volume justifies the tooling. Specify standard head styles and drive types wherever possible—custom heads mean custom dies and longer lead times. If a hole or slot is required, place it away from the head so heading isn’t compromised, and accept that cross-holes are a secondary operation, not a header function. Thread length should match the assembly, not the maximum the machine can roll, since extra thread adds plating and gauging cost. Wire diameter choice also drives cost: standard sizes are stocked and cheap, odd sizes are special-order. Finally, tell the supplier the end use—a fastener for a toy and one for a suspension arm may look identical but need very different grades and verification, and naming the application up front prevents the wrong assumption.

FAQ

What is the minimum volume for cold heading?

Generally a few thousand pieces; below that, machining or Swiss turning is cheaper once tooling is counted.

Can stainless steel be cold headed?

Yes—302, 304, and 316 head well, though work hardening demands careful die design and annealed wire.

Is cold heading stronger than machining?

The grain flow follows the shape, so headed parts are often stronger at the head than machined ones.

How are threads added?

By thread rolling after heading, which strengthens the thread versus cutting and improves fatigue life.

What about complex shapes?

Multi-die headers handle shoulders, recesses, and some off-axis features; the rest is trimmed or machined.