Meet Malco Zip-In Self-Piercing Screws—the dependable fastener designed for fast, clean sheet metal assemblies. Built as a Type A, single-thread drill-in screw, these fasteners deliver a decisive bite that drives through metal with steady, predictable performance. The 5/16 in. slotted hex washer head sits flush and provides a solid, even bearing surface, while the zinc-plated finish guards against corrosion in both indoor and outdoor environments.

• 5/16" slotted hex washer head: wide bearing surface for secure seating and a reliable seal as you tighten.
• Type A single-thread: optimized for quicker penetration and reduced driving resistance on sheet metal runs.
• Zinc-plated finish: corrosion resistance that stands up to humidity, outdoor exposure, and everyday wear.
• Size and quantity: #10 x 1-1/2" screws, packaged in a bulk 250-count for models and jobs that demand repeatability.
• Availability: longer lengths and multiple piece quantities are offered to match material thickness and project scope.

Ideal use scenarios include metal roofing, flashing, siding, and ductwork where a fast, secure tie is essential. The self-piercing design helps you move quickly through assemblies, reducing pre-drill needs and boosting on-site productivity—whether you’re a professional contractor or tackling a weekend metalwork project.

Practical tips for best results: align panels precisely, drive at a steady, controlled rate to maintain thread engagement, and avoid over-tightening to preserve washer seating and material integrity. For outdoor projects, the zinc finish helps resist rust over time, so you can trust these screws to hold fast through changing weather.

With Malco Zip-In Self-Piercing Screws, you’re choosing a purpose-built solution that prioritizes a clean bite, secure hold, and lasting durability across common sheet metal applications.