Malco hw8x1/2z100 Sheet Metal Hex Washer Slotted Self-piercing Screw Size 8 Zinc Plated 1/2 Inch 100 Pack

Product Description

The Malco hw8x1/2z100 is a size 8 self-piercing sheet metal screw built for fast, reliable fastening in metal fabrication and HVAC ductwork applications. This screw features a hex washer head with a slotted drive and a zinc plated finish for corrosion resistance. It is engineered with Malco's Zip-In double thread design, which gives it a significant speed and strength advantage over standard self-piercing screws. The thread length is 1/2 inch, and the head measures 1/4 inch across. These screws are sold in a 100-count pack, making them a practical supply for sheet metal contractors, HVAC installers, and duct fabricators who need a dependable fastener in quantity. The Zip-In screw starts with a single thread that tapers to a fine, sharp point through a controlled heat treat process. This point maintains its strength while allowing clean initial penetration into sheet metal without pre-drilling. A second thread above the point engages immediately after the tip bites in, pulling the screw in at twice the normal rate. The result is faster installation with less effort and less wear on the tool. The double thread design also provides a stronger grip in heavier gauge sheet metal than standard single-thread self-piercing fasteners. Zinc plating gives each screw a protective layer that resists rust and oxidation in typical indoor HVAC and sheet metal environments. The hex washer head distributes clamping load across a wider surface area, reducing the chance of pull-through in thinner metal panels. The slotted drive is compatible with standard flat-head bit accessories. HVAC sheet metal technicians, duct installers, and general sheet metal workers will find this screw well suited for connecting duct sections, securing flanges, and attaching metal panels in both commercial and residential projects. The size 8 diameter and 1/2 inch thread length are among the most commonly used dimensions for light to medium gauge ductwork assembly.

• Double thread Zip-In design drives faster and grips heavier sheet metal gauges than standard self-piercing screws
• Fine sharp point formed through controlled heat treat process allows clean penetration without pre-drilling
• Zinc plated finish resists corrosion in standard HVAC and sheet metal installation environments

Product Highlights

The Malco hw8x1/2z100 self-piercing sheet metal screw delivers faster driving speed and stronger hold in heavier gauges thanks to its patented double thread Zip-In design. The 100-count pack and zinc plated hex washer head make it a reliable, job-ready fastener for HVAC duct and sheet metal work.

Product Information

Standard Information

• Brand: MALCO
• Manufacturer Part Number: hw8x1/2z100

Technical Specifications

• Diameter Thread Size: 8
• Drive Type: Slotted
• Finish: Zinc Plated
• Head Size: 1/4 inches
• Head Type: Hex Washer
• Measurement System: Imperial
• Thread Length: 1/2 inches
• Thread Type: Double
• Type: Self-Piercing