GRK Fasteners RSS™ 5/16 x 6 Inch, Black Multi-Purpose Structural Screws, 300 PCS, Rust Resistant Climatek™ Coating, Decorative Hardware Decking Screws, Star Drive Recess, T-30 Bit Included, Black

GRK 95614
•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.

Meet the GRK RSS Rugged Structural Wood Screw — a professional-grade fastener built for heavy framing, decking, and demanding outdoor builds. This 5/16″ x 6″ black screw comes in a 300-piece box and includes a T-30 bit, so you’re ready to drive from first drill to the final board.

• Self-drilling with Fast Bite Tip and Zip-Tip technology: drive without pilot holes in many wood species, speeding up decking, framing, and timber projects without sacrificing hold.
• W-Cut design: delivers smooth, low-torque driving across pressure-treated lumber, cedar, laminated beams, and other common outdoor woods, reducing driver fatigue and wear on the bit.
• Climatek Black coating: rugged, corrosion-resistant finish engineered for exterior use and harsh environments, ensuring long-lasting performance on treated lumber and outdoor structures.
• ICC-ES ESR-2442 approved: verified for structural applications, giving professional builders and serious DIYers confidence in load-bearing installations.
• Star Drive with 6-point contact: minimizes cam-out and head stripping, so you can consistently drive screws without worrying about stripping or re-driving.
• Versatile application: ideal for deck framing and decking, timber framing, laminated beams, pole barns, and even decorative hardware that benefits from a clean, black finish.
• Value-packed kit: 300 screws in one box, designed for larger projects and repeated use, with a ready-to-use bit included for immediate installation.

Ideal for professionals and DIYers tackling outdoor construction where strength, reliability, and aesthetic finish matter. The GRK RSS answers common questions about wood-to-wood connections in exterior projects: Can you skip pilot holes? Can you rely on a screw for structural loads? Will the finish endure weather and treatment chemicals? The answer with this fastener is yes—when you need a single, high-performance solution for decks, framing, and structural wood work, GRK RSS delivers.

Practical use scenarios:

• Deck building and railing systems where long-term hold and corrosion resistance matter.
• Timber framing and laminated beam connections that require robust, fast, and repeatable fastening.
• Pergolas, outdoor furniture, and decorative hardware where a black, low-profile finish complements the project’s design.

Tips for best results:

• For extremely dense hardwoods, consider a brief pilot hole to guide the screw while still benefiting from a substantial bite.
• Use the included T-30 bit to maximize drive efficiency and extend bit life during large installations.
• Choose the 5/16″ x 6″ size when you need a strong fastening in thick framing or decking boards without compromising on finish or performance.