GRK Fasteners RSS™ 5/16 x 3-1/8 Inch, Black Multi-Purpose Structural Screws, 500 PCS, Rust Resistant Climatek™ Coating, Decorative Hardware Decking Screws, Star Drive Recess, T-30 Bit Included, Black

GRK 95314
•Heavy Duty Lag Screw Alternative: Eliminates pre-drilling in most woods with Zip-Tip technology. Installs 3x faster than traditional lag screws
•ESR-2442 Code Approved For Structural Applications: Engineered for professional-grade connections in heavy duty framing, multi-ply beams, and timber framing. Integrated washer head delivers maximum clamping force for zero-gap joints in LVL, LSL, and engineered lumber.
•Advanced Corrosion Protection: Rust resistant Black Climatek™ coating provides exceptional durability for outdoor use and in pressure-treated lumber applications while matching decorative hardware
•W-cut Thread Design: Reduces installation torque by 40% for smoother, faster driving. CEE threads minimize splitting in dense hardwoods, engineered lumber, and laminated beams.
•Precision Engineering: Star/Torx drive recess with 6 points of contact prevents stripping and minimizes wobble between screws and bits.

GRK RSS Rugged Structural Wood Screw – 5/16 x 3-1/8 Inch, Black Climatek Coated, 500-Pack with T-30 Bit Built for professionals and serious DIYers, the GRK RSS Rugged Structural Wood Screw is a true workhorse for heavy-duty framing, decking, and wood construction. A 500-piece supply of black, corrosion-resistant fasteners, designed to deliver dependable performance in outdoor and treated wood applications—from pressure-treated lumber and cedar to laminated beams and pole barns. Why this screw stands out- Time-saving, hole-free starts: The patented Fast Bite Tip combined with Zip-Tip technology lets you drive straight into wood without predrilling, reducing labor and speeding up large projects while minimizing wood splitting.- Smooth, low-torque driving across all wood types: W-Cut design balances bite and torque for consistent results, so you get predictable driving even in dense or resinous species.- Superior corrosion resistance for outdoor use: The Black Climatek coating provides robust protection against the elements, making these screws ideal for exterior framing, deck projects, and any outdoor woodwork in salt air, moisture, or pressure-treated environments.- Structural confidence, ICC-ES approved: ESR-2442 approval means these self-drilling screws are recognized for structural applications, giving you peace of mind in load-bearing builds.- Reliable drive with six-contact star head: The star drive recess minimizes cam-out and head stripping, helping you maintain a secure socket engagement and finish faster on demanding construction tasks.- Multi-purpose deck and decorative hardware capability: In addition to structural work, these screws are well-suited for decorative decking hardware, offering a clean, uniform black finish that looks great in visible outdoor installations.- Included bit for immediate use: The package includes a T-30 bit and a six-point star drive, so you’re ready to install from the moment you open the box. Ideal uses- Exterior framing and decking projects where long-term corrosion resistance matters- Timber framing, laminated beam connections, and pole barns where high-strength fasteners are required- Cedar, pressure-treated lumber, and other wood species that benefit from a self-drilling, no-pilot-hole approach- Projects seeking a cohesive, dark finish that blends in with black hardware What you get- 500 total screws of GRK RSS 5/16 x 3-1/8 Inch- Black Climatek coating for outdoor durability- Star-drive recess for reliable engagement- T-30 bit included for immediate installation Tips for best results- Use in exterior or treated wood assemblies where a strong, fast, long-lasting connection is needed.- Let the Fast Bite Tip do the work—let the screw lead the way, and avoid forcing the bit to prevent stripping.- Choose the RSS size that matches your lumber thickness and load requirements to ensure proper embedment and performance.- For coastal or highly corrosive environments, rely on the Climatek-coated finish to help extend service life. With GRK RSS, you’re choosing a premium, field-tested solution that combines fast, dependable installation with proven structural performance and durable, visually appealing hardware finish.