GRK RSS 5/16 x 4 Inch Black Multi-Purpose Structural Screws are built for heavy-duty framing, decking, and construction projects, delivering professional-grade performance where reliability matters most. With a durable Black Climatek coating and advanced tip technology, these screws keep your outdoor builds solid and enduring from the first screw to the final bolt-down.

• Size and quantity: 5/16" diameter, 4" length — 400 screws per box
• Coating and durability: Black Climatek coating provides exceptional corrosion resistance for pressure-treated lumber, cedar, and other wood species, extending the life of outdoor structures
• Self-drilling efficiency: Fast Bite Tip and Zip-Tip technology eliminate the need for pilot holes, speeding up installation without sacrificing grip
• Low-torque driving: W-Cut design reduces friction for smoother, easier driving across various wood types
• Secure drive: Star drive head with six-point contact minimizes cam-out and head stripping, even under demanding loads
• Ready to use out of the box: Includes a T-30 bit for immediate use on site
• Structural assurance: ICC-ES ESR-2442 approval verifies suitability for structural applications
• Ideal applications: Deck framing, timber framing, laminated beams, pole barns, and other heavy-duty wood projects

Why this screw design matters

The combination of Fast Bite Tip, Zip-Tip, and W-Cut technology means you can drive these screws directly into timber and treated lumber without pre-drilling, reducing install time and minimizing cracking or splitting. The six-point star drive provides maximum engagement with minimal risk of cam-out, so even long runs stay true and secure. The robust Climatek coating stands up to outdoor exposure, giving you confidence that exterior decks and structural connections won’t rust prematurely.

Who benefits most

Professional builders tackling framing, decking, and timber-intensive jobs will appreciate the reliability and speed, while serious DIYers upgrading outdoor structures or renovating cedar or treated-wood decks will find these screws a dependable, long-lasting solution. If you’re aiming for strong connections that resist the elements and stay true over time, GRK RSS 5/16 x 4 Inch screws are engineered to deliver concrete results with every drive.

From patio decks to pole barns, these screws pair rugged performance with an clean, dark finish that blends with modern hardware. Use them for fast, secure assemblies where you demand durability, precision, and efficiency.