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The 3-6mm High-strength Self-tapping Screws for Metal/Wood redefine versatility in fastening, bridging the gap between metal and wood applications with a design that excels in both substrates.
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At the forefront of its innovation is the Hi-Lo thread design—a dual-pitch system that reduces driving torque by 40% while enhancing grip strength. This engineering breakthrough allows the same screw to penetrate metal sheets and wooden components without compromising performance. The yellow zinc plating, applied via a multi-layer process, delivers exceptional corrosion resistance, making these screws suitable for indoor, outdoor, and high-moisture environments. Unlike single-purpose fasteners, this product eliminates the need for separate metal and wood screws, streamlining inventory and installation processes for professionals and DIYers alike.
Material: Heat-treated carbon steel (10B21 grade) with 8.8 grade tensile strength, finished with yellow zinc plating
Drive Type: Pozi drive (PZ2) with deep recess for high-torque applications and reduced cam-out
Thread Type: Hi-Lo twin-thread (deep metal thread + shallow wood thread) with self-tapping tip
Diameter: 3mm to 6mm (M3 to M6)
Length: 16mm to 100mm, covering thin sheets to thick structural members
Corrosion Resistance: Passed 1,000-hour salt spray test per ISO 9227, exceeding industry standards
Shear Strength: 250kg in softwoods (pine/spruce) and 1,200N in 1.2mm mild steel sheets
Torque Reduction: Hi-Lo threads reduce driving torque by 40% compared to standard single-thread designs
Hi-Lo Thread Technology: This dual-thread system features a deeper, coarser thread for metal penetration—designed to cut cleanly through 1.5mm thick steel without pre-drilling—and a shallower, finer thread for wood engagement that minimizes splitting. The alternating pitch creates a mechanical lock in both materials, reducing loosening under vibration by 60%.
Yellow Zinc Plating: Applied in three layers (zinc, conversion coating, and sealant), this finish provides a protective barrier against rust, UV degradation, and chemical exposure. In outdoor applications, it extends service life by up to 5 years compared to standard zinc plating.
Pozi Drive System: The four-lobe recess design distributes torque evenly across the driver contact area, minimizing slippage (cam-out) by 70% compared to Phillips drives. This ensures consistent installation in high-volume projects, reducing fastener damage and tool wear.
Self-Tapping Capability: The precision-ground tip features a 45° cutting angle and sharp flutes that drill and tap threads simultaneously in metal sheets up to 1.5mm thick. In wood, the tip pierces fibers cleanly, eliminating the need for pilot holes in all but the densest hardwoods.
Multi-Material Performance: Engineered to transition seamlessly between metal and wood, these screws secure metal brackets to wooden beams in deck construction, fasten metal furniture frames to wooden panels, and reinforce wooden structures with metal angle brackets—all with a single fastener type.
Automotive Industry: Used in vehicle interior assemblies to mount metal trim panels to wooden dashboards, where vibration resistance prevents rattling; and in aftermarket modifications, securing metal accessories to wooden cargo areas.
Construction: Ideal for metal-to-wood connections in deck framing, where the Hi-Lo threads secure metal joist hangers to wooden beams; roofing applications, fastening metal flashing to wooden rafters; and exterior siding, attaching metal trim to wooden substrates.
Industrial Manufacturing: Trusted in machinery enclosure assembly, where the screws join metal frames with wooden backing panels; and in pallet production, securing metal reinforcement plates to wooden slats for heavy-load capacity.
Furniture Assembly: Secures metal table legs to wooden tabletops with minimal splitting; joins metal bed frames to wooden headboards; and fastens metal drawer slides to wooden cabinet carcasses, ensuring smooth operation.
DIY Projects: Perfect for building metal-wood hybrid structures like garden gates (metal frames with wooden slats), tool storage racks (metal brackets on wooden walls), and workbenches (metal vises mounted to wooden tops).
