Meet the Malco Zip-In Self-Piercing Screws, a purpose-built solution for fast, reliable metal fastening. Built for efficient installations, these Type A screws feature a 5/16 in. slotted hex washer head and a zinc-plated finish that stands up to outdoor use and moisture exposure. The 2" length with a #12 diameter provides strong hold in thin to medium-thickness sheet metal, delivering solid pull-through resistance without the need for pre-drilling in many applications. Model: HW12X2T, sold in a convenient 250-piece pack.

Fast, one-step fastening that saves time

The self-piercing design lets you drive directly into metal, reducing drilling steps and speeding up installations on projects like roofing, siding, ductwork, and metal enclosures. The washer head helps seal the fastener to the surface, creating a tidy, weather-resistant finish that remains secure over time.

Key features that set it apart

• Type A single-thread profile: optimized for quick bite and dependable grip in thin metal, minimizing resistance during installation.
• 5/16" slotted hex washer head: a robust, flush-fitting head that distributes load and helps prevent pull-out.
• Zinc-plated finish: provides corrosion resistance for outdoor and moist environments, extending the life of the joint.
• 250-count bulk pack: ideal for larger jobs or ongoing repair/installation work without frequent reordering.
• #12 x 2" size: versatile length that delivers solid thread engagement for secure fastening in typical sheet-metal assemblies.

Ideal applications

• Roofing and siding installations where quick, weather-ready sealing is essential
• Thin-gauge sheet metal assemblies in HVAC, ductwork, and metal enclosures
• Fabrication projects that require reliable fasteners with built-in washers to reduce leaks
• DIY projects and professional builds where speed and durability matter most

Practical installation guidelines

• Use a drill/driver with appropriate speed to maintain control and prevent over-tightening that could crush the washer.
• For very thin or delicate metals, start with a light, steady drive and let the self-piercing design do the work to avoid distortion.
• In thicker or multi-layer assemblies, you may still rely on pilot guidance or pre-pierce in select cases to ensure clean seating.
• Ensure you’re using compatible bits for the screw head to minimize cam-out and maximize bite.

What’s included

• 250 Malco Zip-In Self-Piercing Screws, model HW12X2T, with 5/16" slotted hex washer heads and zinc plating