Cold Heading Wire for Wood and Sheet Metal Screws

Wood screws and sheet metal screws are the high-volume backbone of the fastener industry. They’re produced by the millions per shift on multi-die headers, and the wire grade selection is driven less by extreme strength requirements than by reliable cold-heading performance, good thread-forming behavior, and consistent finish for plating or coating.

This page covers grade selection and material considerations for the high-volume screw production segment.

Grade selection by screw type

Standard wood screws (uncoated or zinc-plated)

C1010 is the most common choice. Excellent formability for the sharp thread profile wood screws require, good weldability for tip-pointing operations, and a clean surface for plating.

For larger wood screws (#12 and up) or applications requiring more installation torque, C1018 offers more strength with adequate formability.

Sheet metal screws (type A, AB, B)

C1018 is widely used for sheet metal screws. Most are case-hardened after forming to produce a hard thread-forming surface — C1018 carburizes well and produces consistent case depth. C1018 is available on special order.

For higher-volume production with aggressive thread profiles, C1022 can be substituted. The higher manganese gives better case depth predictability at the cost of slightly lower formability.

Drywall screws

Drywall screws have specific challenges: thin shank, deep thread, and a bugle head with a Phillips recess. C1018 is the standard. Drywall screws are typically case-hardened to produce the hard, brittle behavior that helps the screw stop at the drywall surface when installed with a screw gun.

Deck and concrete screws

These typically require more strength than wood screws. C1022 or 10B21 are common, depending on whether the screw is case-hardened (C1022) or through-hardened (10B21).

Material condition: SAFS or SAIP

Most high-volume wood and sheet metal screw production uses SAIP material. The tighter dimensional tolerances suit high-speed automated headers, and the moderate forming requirements of standard screws don’t push the formability limits where SAFS would be needed. For specialty screws with deeper extrusions or more aggressive head geometries, SAFS is available at no premium reduction (SAFS is actually the less-expensive of the two).

Both conditions ship P&L-coated as standard.

Surface cleanliness matters for clear coats. If you’re applying a clear topcoat (Magni, Geomet, etc.), specify clean CHQ wire and discuss your coating spec with us — some surface treatments work better than others for downstream clear coating.

Production volume considerations

High-volume screw production (think 50,000+ pieces per shift on a single header) has different requirements than low-volume specialty fasteners:

Inventory continuity. A header running a high-volume part program needs material continuity — switching grades or mills mid-program causes process upsets. We work with high-volume screw manufacturers on standing-order arrangements and multi-coil heat segregation to support this.

Reject rates matter more than spec compliance. A wire that meets spec but has a 0.5% heading reject rate is more expensive than a wire that’s slightly out-of-spec but heads cleanly. Track your reject rate by heat number — patterns will tell you which mill production runs are best for your operation.

Tool life is a cost line item. SAIP material, spheroidize annealing for higher-carbon grades, and consistent chemistry from a known mill source all directly affect die life. The $2/cwt SAIP premium often pays back in extended tool life alone.

Why high-volume screw manufacturers source from Nevers

• Continuous stock of the high-volume grades. C1010, C1018, and C1022 in the diameters wood and sheet metal screws use
• SAFS and SAIP available on all three grades
• Single-heat segregation available for production runs requiring material consistency
• USA melt for buyers serving customers with domestic-content requirements
• Same-day shipping for production-critical inventory gaps

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Frequently Asked Questions

What’s the most common wire grade for wood screws? C1010 is the most common grade for standard wood screws. Its formability suits the sharp thread profile, and it plates cleanly. Larger or higher-strength wood screws use C1018.

Are wood screws case-hardened? Most wood screws are not — the wood itself is soft enough that the as-headed steel cuts threads adequately. Sheet metal screws and self-tapping screws are case-hardened because they need to form threads in steel.

What’s the difference between C1010 and C1018 for screws? C1010 has lower carbon (0.08–0.13%) and is more formable. C1018 has higher carbon (0.15–0.20%) and is stronger as-headed. For sharp thread profiles and complex head geometries, C1010 forms more reliably. For applications requiring more installation torque, C1018 is better.

Does Nevers stock material specifically for drywall screw production? C1018 in the diameters typical for drywall screw production (0.135”–0.219”) is available on special order — contact us with your requirements and we’ll quote sourcing and lead time. For stocked grades, C1010 or C1022 are alternatives depending on your application.

What condition does Nevers stock for drywall screw production? Both SAFS and SAIP. SAIP is the more common choice for high-volume drywall screw lines due to its dimensional consistency. SAFS is available for production runs needing more aggressive bugle-head forming.

What’s the typical wire diameter for #8 sheet metal screws? A #8 sheet metal screw typically uses around 0.142”–0.150” wire, depending on the specific screw design and the manufacturer’s part program. Specific sizing should be confirmed with your screw manufacturer’s specifications.