Malco HW7X1/2Z-1M Sheet Metal Screw 7x1/2 Zinc 1000pk

Product Description

The MALCO HW7X1/2Z-1M is a self-piercing sheet metal screw designed for fast, clean fastening in HVAC ductwork and light sheet metal fabrication. Built in a number 7 diameter by 0.5 inch length, it features a hex washer slotted head with an undercut-indented design for burr-free installation. The zinc plated, heat treated construction resists corrosion and maintains structural integrity under repeated torque. A combination lead double thread and sharp tapered point allow the screw to pierce metal cleanly without mushrooming, breaking, or walking off the mark. Sold in a 1,000-piece pail, this SKU suits high-volume sheet metal work on the bench or in the field.

This screw is a standard fastener for residential and light commercial HVAC duct assembly, including trunk lines, takeoffs, and register connections. The sharp tapered point self-pierces without a pilot hole in typical duct-gauge sheet metal, reducing setup time on production runs. The slotted hex washer head accepts both a standard hex driver and a flat-blade bit, giving installers flexibility in tight spaces. Field technicians, duct fabricators, and sheet metal apprentices all reach for this style of screw as the daily workhorse on duct seaming and fitting attachment.

Key Features

• Sharp tapered point self-pierces sheet metal without pilot hole and will not mushroom, break, or walk
• Burr-free hex washer slotted head leaves a clean finish on duct surfaces
• Undercut-indented hex washer head provides precise operator control and consistent hole alignment
• Combination lead double thread design for fast engagement and secure hold
• Zinc plated and heat treated for corrosion resistance and added hardness
• 1,000-piece pail quantity suited to production duct shops and high-volume service crews

Compatibility

Designed as an OEM-style replacement and standard fastener for light-gauge sheet metal assemblies common in residential and commercial HVAC duct fabrication and installation.

Installation Notes

Sheet metal screws of this type are installed by licensed HVAC technicians and sheet metal workers following applicable mechanical codes. Power down any air-handling equipment and relieve system pressure before fastening ductwork. Use a hex-head driver or screw gun set to the appropriate clutch depth to avoid overdriving and distorting the duct surface. Do not mix with self-tapping screws that require a pre-drilled pilot hole, as the self-piercing tip geometry is specific to this application.

Technical Specifications

• Nominal Diameter: No. 7
• Length: 0.5 inches
• Head Style: Hex Washer
• Drive Style: Slotted
• Finish: Zinc Plated
• Process: Heat Treated
• Thread Type: Combination Lead Double Thread
• Point Type: Sharp Tapered Self-Piercing
• Quantity: 1000 per Pail

Standard Information

• Brand: MALCO
• Manufacturer Part Number: HW7X1/2Z-1M