L H Dottie Co TEKHW634 Hex Washer Head Self-drilling Screw

Product Description

The L H DOTTIE CO TEKHW634 is a No. 6 x 0.75 inch hex washer head self-drilling screw designed for fast, reliable fastening without the need for a pilot hole. The self-drilling point bores through the substrate and taps its own thread in a single step, reducing installation time on metal framing, HVAC ductwork, electrical enclosures, and light structural applications. The hex washer head provides a broad bearing surface for a secure, flush-seated connection and accepts a standard hex driver bit. This type of fastener is a staple in HVAC, sheet metal, and electrical trade work.

The TEKHW634 suits light-gauge metal-to-metal and metal-to-substrate fastening tasks common in residential and commercial mechanical and electrical installations. Typical applications include securing sheet metal duct sections, attaching junction box covers, fastening electrical enclosures, and assembling light steel framing components. The self-drilling design is well suited for production work where speed and consistency matter. Sold individually per unit of measure.

Key Features

• Self-drilling point eliminates the need for a separate pilot hole step
• Hex washer head provides wide bearing surface and resists pull-through
• No. 6 diameter x 0.75 inch length suits light-gauge metal fastening applications
• Compatible with standard hex driver bits and magnetic nut setters
• Compact size suited for close-quarter and finish fastening work

Compatibility

Designed as a standard No. 6 x 0.75 inch hex washer head self-drilling screw suitable for light-gauge metal fastening applications in HVAC, electrical, and sheet metal work.

Installation Notes

Installation is performed by HVAC technicians, electricians, and sheet metal workers using a hex driver bit or magnetic nut setter in a power drill or impact driver. Confirm substrate gauge is within the rated range for the self-drilling point before driving. Do not overdrive the fastener, as the washer head and substrate can be damaged by excessive torque. Follow applicable NEC or mechanical code requirements for the specific application being fastened.