Bi-Metal Hex Head Self Drilling Tek Screws with Fluted Drill Point
Understanding Bi-Metal: Two Metals, One Mission
At Fasto, we believe a fastener shouldn't force you to choose between mechanical strength and rust protection. Our Bi-Metal Self-Drilling Screws are specialized fasteners manufactured by metallurgically bonding two distinct metals into a single unit.
While ordinary stainless steel screws often fail or "burn out" when facing hard structural materials, our Bi-Metal hybrid combines the aggressive drilling power of alloy steel with the lifetime endurance of stainless steel. It is the definitive solution for high-stakes infrastructure, marine structures, and solar mounting systems.
Technical Anatomy: Built for Performance
1. The Hardened Point (SCM435 / SS420)
The business end of the screw is forged from either SCM435 Alloy Steel or SS420 Martensitic Stainless Steel. After precision heat treatment, this tip achieves the extreme tensile strength and hardness required to act as a high-speed drill bit.
- #5 Spiral Drill Point: Specifically designed to penetrate heavy structural steel without the need for a pilot hole.
- Efficiency: Significantly reduces the risk of screw breakage during installation in hard substrates.
2. The Stainless Steel Body (SS304 / SS316)
The head and the upper shank—the parts exposed to the atmosphere—are crafted from SS304 or SS316 Stainless Steel. This provides an impenetrable barrier against corrosion, especially in salt-mist marine environments or harsh industrial atmospheres.
3. Metallurgical Bonding
These two sections are not just "attached"—they are metallurgically bonded during the manufacturing process. This creates a durable, reliable fastener that performs as a single, cohesive piece under high-torque loads.
Key Features & Advantages
- Superior Drilling Capability: Unlike standard stainless fasteners, the hardened SCM435/SS420 tip bites into hard materials with ease.
- Reduced Installation Risk: Engineered to withstand high-torque forces, minimizing the downtime caused by snapped heads or blunt points.
- Long Service Life: Designed for a 25+ year lifecycle in outdoor and industrial applications.
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Cost Efficiency: By combining strength and resistance, these screws dramatically reduce long-term maintenance and replacement costs.
Technical Specifications (Verified Standards)
Core Applications
- Solar Panel Mounting Systems: The industry standard for aluminum-to-steel connections.
- Roofing & Cladding: Ensuring watertight integrity in metal-to-metal fastening.
- Marine Structures: Critical protection in high-chloride salt environments.
- HVAC & Infrastructure: Reliable performance in demanding industrial atmospheres
Why Fasto Bi-Metal?
Bimetal screws are high-performance fasteners designed for environments where failure is not an option. At Fasto, we integrate the technical depth of SCM435 alloy steel and the precision of #5 spiral points to ensure your project stays secure for decades.