Timco 5.5x85mm Metal Construction Screws, Bi-Metal, 100 Pack
Timco's 5.5x85mm bi-metal screws for wood-to-steel connections. Self-drilling, countersunk with wing-tip design. Ideal for exterior use.
The Timco 5.5x85mm Metal Construction Screws are precision-engineered fasteners specifically designed for attaching timber to light section steel (up to 5mm thickness). These screws feature an innovative wing-tip design that reams out the timber, allowing the screw to achieve maximum RPM without burning out. When the wings encounter metal, they break off to enable the thread to self-tap into the metal.
Constructed from bi-metal material, these screws combine a hardened carbon steel drill tip fused to an A2-304 Austenitic Stainless Steel body, offering excellent durability and corrosion resistance - making them suitable for exterior applications. The partially threaded (P/T) design provides greater holding power while reducing splitting in timber applications.
These screws feature a countersunk head with ribs for secure seating and a Phillips recess for easy driving. Their self-drilling No.3 point eliminates the need for pre-drilling in most applications, saving time and effort during installation.
Key Features:
- Wing-tip design for efficient timber and metal penetration
- Bi-metal construction for strength and corrosion resistance
- Self-drilling point eliminates pre-drilling
- Countersunk head with ribs for flush finish
- Phillips drive for compatibility with standard screwdrivers
- Suitable for exterior applications with organic coating
- Attaching wood to light section steel (≤5mm)
- Exterior construction applications
- Timber frame to metal bracket connections
- Decking to metal substructure
- Thread Diameter: 5.5mm
- Length: 85mm
- Head Type: Countersunk with Ribs
- Recess Type: Phillips
- Point Type: Self-Drilling No.3
- Material: Bi-Metal (A2-304 Stainless Steel/Carbon Steel)
- Effective Thread Length: 47mm (P/T)
- Max Drilling Thickness: 5.0mm
- Suitable Timber Thickness: 44-63mm
- Quantity: 100 pieces
- Weight: 1140g
- Special Feature: Wing-tip design
- Special Feature: Exterior-grade organic coating
Always follow local regulations and product guidance.
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