Malco Zip-In Self-Piercing Screws | 5/16″ Slotted Hex Washer Head Sheet Metal Screws | Type A Single Thread | Zinc Plated (50, #10 x 1-1/2″)

Malco HW10X11/2G
•Screws have 5/16 in. slotted hex head.
•Screws are Zinc plated.
•Drill-in screws are Type A.
•Screws are single thread.

Meet the Malco Zip-In Self-Piercing Screws — a purpose-built fastener engineered for quick, reliable metal-to-metal installations without pre-drilling. Designed for thin sheet metal work, these screws pair a rugged 5/16″ slotted hex washer head with a Type A single-thread profile to deliver fast, clean driving and strong holds from first bite to final seat.

Key details at a glance:

• Head and drive:5/16″ slotted hex washer head combines a broad bearing surface with a simple, traditional drive that minimizes cam-out on hard metals.
• Thread design:Type A single-thread provides efficient cutting action and steady torque for faster installation on single-pass applications.
• Finish:Zinc-plated coating offers solid corrosion resistance for indoor and mild outdoor environments.
• Size and quantity:Pack includes 50 screws, sized #10 x 1-1/2″ for versatile use across common sheet metal projects.
• Versatility:Available in longer lengths and other pack sizes, enabling you to scale for bigger jobs or tighter installations.

Why Choose Malco Zip-In Self-Piercing Screws?

These screws are purpose-built for efficiency. The self-piercing action eliminates the need for pilot holes in many light- to medium-gauge sheet metals, slashing installation time on ductwork, metal roofing, siding, enclosures, and similar applications. The hex washer head provides a secure, flush finish that seals well against moisture, while the zinc finish helps resist corrosion in everyday use.

Ideal use cases

• HVAC ductwork and metal enclosures where speed and reliability matter
• Light to moderate gauge metal roofing or siding projects
• Thin metal panels for automotive trim or appliance housings
• Any project that benefits from fast, strong holds with minimal pre-drilling

Installation tips

• Use a standard slotted screwdriver or a compatible drill/driver with a slotted bit to maintain proper alignment and prevent cam-out.
• Align screws carefully to ensure the washer seats evenly for the best seal and load distribution.
• When expanding beyond the 1-1/2″ length, consider longer variants to accommodate thicker assemblies or additional layers.

With the Malco Zip-In line, you get a dependable fastener that combines straightforward installation with enduring performance. The 50-piece count is perfect for one-off projects or stocking up your shop for ongoing metalworking tasks. If you’re tackling ductwork, panels, or light metal assemblies, these screws deliver a consistent bite, a secure hold, and a finish you can trust.