AnchorMark Decking Screw 45mm S2 TTA 316SS 5.5mm 663650 is a professional-grade timber-to-aluminium fastener engineered for securing hardwood and composite decking to aluminium joists. This premium 316 marine-grade stainless steel screw features a wing drill tip for self-drilling capability through aluminium without pre-drilling and a barefoot-safe step head design that sits flush with the deck surface. The innovative Sit®-Drive system (TX20 compatible) provides superior torque transfer and reduces cam-out during installation.

The 5.5mm diameter x 45mm length is specifically designed for TTA (timber-to-aluminium) applications where corrosion resistance is critical. The wing tip drills cleanly through aluminium joists while the sharp thread design ensures secure grip in hardwood decking materials. The step head countersinks perfectly creating a smooth barefoot-safe finish ideal for outdoor living spaces and pool decking.

These screws are perfect for coastal environments, marine applications, and high-moisture areas where maximum corrosion resistance is essential. The 316 stainless steel construction delivers superior performance compared to 304 grade in saltwater and chlorinated environments. The Sit®-Drive engagement system provides positive bit retention and consistent torque application reducing installer fatigue on large decking projects.

Includes:

• AnchorMark 45mm Decking Screws (100 pack)
• 316 Marine-Grade Stainless Steel
• Wing Drill Tip
• Barefoot-Safe Step Head
• Sit®-Drive / TX20 Compatible
• 5.5mm Diameter x 45mm Length