Malco Zip-In Self-Piercing Screws | 5/16" Slotted Hex Washer Head Sheet Metal Screws | Type A Single Thread | Zinc Plated (3500, #10 x 1-1/2")

Malco Zip-In Self-Piercing Screws deliver fast, reliable fastening for thin metal and flashing projects. Designed as drill-in screws, they pierce straight into sheet metal with no pre-drilling required, helping you complete installations faster and with less effort.

Key features that set these screws apart:

• Size and head: 5/16" slotted hex washer head, perfect for secure seating and a clean finish on metal surfaces.
• Thread design: Type A single thread for quick penetration and reduced binding in thin-gared metal applications.
• Finish: Zinc-plated for corrosion resistance in outdoor, damp, or humid environments.
• Size availability: Typically supplied as #10 x 1-1/2" in this line, with options for longer lengths to accommodate thicker assemblies.
• Quantity flexibility: Available in multiple piece quantities to suit both small repairs and large-scale projects.

Why choose Malco Zip-In over traditional fasteners? The self-piercing, drill-in design saves time on every installation by eliminating pre-drilling, while the single-thread geometry speeds up driving in thin metal without sacrificing grip. The zinc finish provides enduring corrosion resistance, making these screws suitable for exterior applications such as metal roofing, flashing, gutters, and HVAC ductwork, as well as interior metal panel installations.

Practical tips for best results:

• Align the fastener with the sheet edge and apply steady, even pressure for clean penetration.
• Avoid over-tightening to prevent distortion or tearing of thin metal. Use a drill-driver with appropriate torque settings for consistent results.
• If you’re working outdoors or in exposed conditions, rely on the zinc plating for corrosion resistance and consider sealing joints as needed to maximize longevity.
• Choose the length to match your material thickness; longer lengths are available for thicker assemblies when more hold is required.

Whether you’re a professional contractor tackling metal roofing or flashing projects, or a DIYer upgrading gutters and trim, Malco HW10X1 1/2" drill-in screws with a 5/16" slotted hex washer head give you a reliable, efficient fastening solution that moves your project forward quickly and with confidence.