Meet Malco Zip-In HW6X3/8ZT — a 6 x 3/8 inch self-piercing sheet metal screw engineered for speed, strength, and flawless joinery. With a 1/4" slotted hex washer head and zinc-plated finish, this bulk package is tailor-made for professionals who demand consistent results on metal roofing, ductwork, automotive body work, and fabrication projects.

The Zip-In advantage starts with its innovative thread design and meticulous heat-treating. The screw tapers to a fine, sharp point without sacrificing point strength, so you get dependable penetration from the very first turn. A single starting thread extends right to the tip, delivering piercing power in a single motion. As soon as the point bites, a second thread above the point engages to bite again, effectively drilling in double-fast and creating a solid, secure hold in one pass.

• Faster driving, less effort: Dual-thread engagement means quicker penetration and fewer drive cycles, saving time on every project.
• Strong for heavier gauges: Optimized for fastening heavier gauges of sheet metal more reliably than standard self-piercing screws.
• Corrosion resistance for long life: Durable zinc-plated finish protects against the elements, making it suitable for indoor and exterior applications.
• Precise, reliable fit: 1/4" slotted hex washer head provides a secure seating and consistent drive experience, helping to prevent cam-out and stripped fasteners.
• Versatile bulk value: Sold in a 1000-count package for shops and crews that run continuous installations across multiple projects.

Ideal use cases: auto body repairs, HVAC ductwork, roofing and siding installations, metal cabinetry, and various fabrication tasks where clean penetration and high holding power are essential. This screw shines in multi-layer assemblies where speed and reliable bite through different thicknesses are required, reducing the need for pre-drilling and minimizing field downtime.

How it compares to traditional self-piercing screws: Zip-In’s tapered point with a single tip thread delivers immediate penetration, while the second thread ensures rapid, secure engagement after entry. The heat-treated point maintains strength under repeated driving, letting you fasten thicker or layered sheets without sacrificing performance or increasing the risk of thread stripping.

Technical snapshot:

• 6 x 3/8 inch
• Drive: 1/4" slotted hex washer head
• Finish: Zinc plated
• Count: 1000 per package
• Application: Self-piercing sheet metal fastening