*USED* ST x13 cross semi-round head self-tapping carbon steel galvanized screws; A75C; K032

Introducing the *USED* ST 4.2x13 cross semi-round head self-tapping carbon steel galvanized screws—a practical, budget-friendly solution built for quick, reliable fastening on soft metals and lightweight brackets. This lot carries the A75C; K032 codes, offering traceable batch information for peace of mind even in pre-owned hardware.

Key specifications at a glance

• Diameter: 4.2 mm; Length: 13 mm


• Drive: Phillips cross (PH) for standard screwdrivers


• Head style: Semi-round for a slightly domed, unobtrusive finish


• Threading: Self-tapping to form its own threads in compatible materials


• Material and finish: Carbon steel with galvanizing for corrosion resistance


• Condition: Used


• Code: A75C; K032

Why choose these screws for your project

These screws blend robust carbon steel strength with a protective galvanized coating, delivering dependable performance in both indoor and outdoor settings. The semi-round head provides a clean, professional look while still allowing easy driving and a secure seating. The Phillips drive minimizes cam-out, making installation smoother on metal panels, light brackets, and thin sheets where a quick, self-tapping fix is essential.

Ideal use cases

• Light gauge metal sheets and thin panels (enclosures, HVAC components, electrical boxes)


• Light-duty metal brackets and fittings


• DIY repairs and maintenance where cost efficiency matters without sacrificing reliability


• Projects requiring a flush-to-surface or slightly raised finish with solid grip

Tips for best results

• For smooth tapping, align with the material’s thickness and use a pilot guidance approach when needed; apply steady, moderate pressure to avoid thread distortion.


• In harder metals, consider a small pilot hole to prevent dulling the self-tapping points and to reduce driving torque.


• Check the galvanized finish after installation; minor wear is common in used hardware, but the coating still provides corrosion protection when kept dry and protected.


• Store used screws in a dry, organized container to preserve their condition and make future projects faster to complete.

Designed for practical, value-oriented projects, these ST x13 cross semi-round head self-tapping screws give you reliable fastening with corrosion resistance, all in a cost-conscious used package. Perfect for hobbyists, technicians, and professionals who want dependable performance without paying premium new-item prices.