Bi-Metal Self-Drilling Screws (304 + 410) Bi-metal self-drilling screws are a type of fastener designed to drill into hard materials like steel or metal decking without the need for pre-drilling. They're especially useful in construction or industrial applications where fastening stainless steel to steel substrates is required. Key Features: Bi-metal Composition: Typically made with a stainless steel body (for corrosion resistance) and a carbon steel drill point (for hardness and drilling capability). Self-Drilling Tip: The hardened carbon steel tip acts like a drill bit, allowing the screw to penetrate metal without a pilot hole. Corrosion Resistance: The stainless steel upper portion resists rust, making them ideal for outdoor or marine environments. Thread Design: Often engineered for optimal grip in both thin and thick metal profiles. Composition: 304 Stainless Steel (Head & Shank): Excellent corrosion resistance Ideal for outdoor, coastal, or high-moisture environments Non-magnetic and highly durable 410 Hardened Carbon Steel (Drill Point): High hardness and strength Can drill through structural steel (up to ~12mm or more depending on the screw design) Magnetic, heat-treated for cutting performance ✅ Advantages: No pre-drilling required, even into heavy-gauge steel Corrosion resistance where it matters (the exposed part — the shank and head — are 304 stainless) Reliable drilling performance due to the hardened 410 tip Aesthetic finish with the stainless steel head (especially important for visible installations) ⚙️ Typical Uses: Fastening stainless steel sheets to steel frames Rooftop solar panel systems Electrical or HVAC panel installation Metal decking or siding in industrial buildings Marine or coastal construction 📏 Common Specs: Diameter - 4.2, 4.8, 5.5, 6.3, #8, #10, #12 Length - 1" to 6" Head Type - Hex washer, pan, countersunk Drive Type - Phillips, Torx, Hex If you have any requirement, please email us on sales@sagarsteel.net or call us on +91 9920177883