High-Speed Self-Drilling Screws for Metal Construction
In the fast-paced world of metal roofing and steel frame construction, time is money. Self-Drilling Screws from Donghuang, commonly known as Tek screws, are the ultimate time-saving solution. These fasteners feature a built-in drill bit point that allows them to drill, tap, and fasten in a single, continuous motion. By eliminating the need for separate drilling and tapping steps, Donghuang helps contractors reduce labor time by up to 50% on large-scale steel projects. Whether you are fastening metal-to-metal or wood-to-metal, our self-drilling screws provide a high-strength mechanical bond with unrivaled efficiency, ensuring your projects are completed ahead of schedule and under budget.
Engineering the Perfect Drill Point
Not all drill points are created equal. At Donghuang, we use a specialized cold-forging process to ensure the drill flutes are sharp and the point is perfectly centered. A dull or off-center point can lead to "walking" on the metal surface, which scratches the protective coating of the steel sheets. Our screws are categorized by their drilling capacity—our heavy-duty #5 point screws can penetrate up to 12.5mm of structural steel without a pilot hole. We use high-carbon steel that is through-hardened for the drill point while maintaining a slightly more ductile shank to handle the lateral stresses caused by thermal expansion and contraction in large-scale metal buildings.
Sealing and Weatherproofing Solutions
Since self-drilling screws are frequently used in roofing and siding, preventing water ingress is a top priority. Donghuang offers self-drilling screws equipped with EPDM backed washers. These washers are resistant to UV radiation and extreme temperature fluctuations, creating a watertight seal that lasts for decades. To complement the durability of the EPDM, our screws are coated with advanced anti-corrosion finishes like Silver Ruspert or color-matched powder coatings that blend seamlessly with the building’s exterior. This attention to detail ensures that the fastener is never the weak link in a building's envelope, protecting the structural assets within from leaks and subsequent rust damage.
The Donghuang Standard of Reliability
Choosing Donghuang means choosing a fastener that has been tested in the most demanding environments. We perform rigorous "speed-to-drill" tests to ensure our screws meet industry benchmarks for efficiency. Our self-drilling screws are used globally in pre-engineered metal buildings (PEMB), solar panel mounting systems, and HVAC ductwork. With Donghuang, you get a fastener that bites instantly, drills smoothly, and holds tightly. We provide technical data sheets covering pull-out, shear, and torque values to help engineers specify the correct fastener for every application, ensuring safety and compliance with international building codes and standards for industrial and commercial construction.
