Elevate your outdoor construction projects with SPAX Double Thread Screws. Designed for unmatched durability and performance, these screws are engineered with a unique double thread that ensures a tight, secure connection between wooden pieces. The innovative design features a small gap between threads, which creates a powerful clamping effect and prevents loosening over time. This results in a strong, gap-free bond, making them ideal for decking, fencing, and other wood applications. Crafted from premium 304 stainless steel, these screws offer exceptional corrosion resistance, making them perfect for use in outdoor and coastal environments. The flat head provides a clean, flush finish, while the patented tip with cutting serrations ensures faster, easier driving. The T-STAR Plus drive system enhances bit engagement compared to traditional Phillips and square drives, delivering a more secure hold. Fully compliant with code requirements, these screws are suitable for use with ground contact, pressure-treated, and fire-retardant lumber. SPAX screws meet industry standards including AWPA UC1-UC4B, UCFA, and UCFB, guaranteeing reliability and performance.