GRK Fasteners RSS Structural Screw 5/16" x 6" T30 Star Drive brings professional-grade strength and ease of installation to your toughest woodworking and construction projects. Crafted from specially case-hardened steel and finished with GRK’s proprietary Climatek™ coating, this structural screw resists corrosion and delivers exceptional tensile and shear performance—ideal for both interior and exterior applications. The built-in washer head and precision-engineered thread design make it an efficient lag-screw alternative that bites instantly into hardwoods without splitting, while self-drilling features eliminate the need for pre-drilling.

Whether you’re installing ledger boards, securing deck posts, framing carrying beams or building playground equipment, the RSS screw’s zero-stripping Star Drive and CEE™ thread technology ensure fast, reliable drive and maximum holding power with minimal effort.

Key Features

• Recessed T30 Star Drive with six points of contact for zero stripping
• CEE™ thread enlarges the pilot hole to reduce splitting and increase draw strength
• Built-in washer head delivers immense holding power and even load distribution
• Precision cutting pockets create a clean hole and further reduce splitting
• Case-hardened steel for high tensile, torque and shear strength
• Climatek™ coating (AC257 code approved) for superior corrosion resistance in treated lumber
• Zip™ Tip™ for no-pre-drilling, faster penetration
• Cut™ geometry for low torque and faster drive