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GRK RSS Structural Screws

SKU:
GRK_RSS_.3125x2.5
$0.65
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Description

GRK RSS Rugged Structural Screws - 5/16"x2-1/2" – The Premium Lag Screw Alternative

 
GRK RSS Rugged Structural Screws - 5/16"x2-1/2" are engineered for professional-grade strength and effortless installation in demanding wood-to-wood structural applications. Built from specially hardened steel, these screws deliver exceptional tensile, torque, and shear strength while outperforming traditional lag screws in speed and ease of use.
 
Whether you're building deck substructures, installing ledger boards, assembling multi-ply beams, or working with LVL and LSL, GRK RSS screws provide reliable, code-approved performance without the hassle of pre-drilling in most woods.
 
Why GRK RSS Structural Screws Outperform Traditional Lag Screws
  • Faster, easier installation — Zip-Tip™ and Fast Bite Tip allow one-step driving with no pre-drilling required in most applications.
  • Reduced wood splitting — CEE Thread™ technology (on screws 3-1/8" and longer) enlarges the pilot hole for the shank, minimizing friction and splitting even in dense hardwoods and engineered lumber.
  • Superior clamping force — The integrated washer head combined with unique thread design draws materials tightly together for zero-gap joints.
  • Low torque, high productivity — W-Cut™ thread design dramatically reduces driving torque for smoother, faster installs and less fatigue.
  • Zero stripping — Star (Torx) drive recess provides 6 points of contact for secure bit engagement. Precision Fit design minimizes wobble when used with GRK bits.
  • Corrosion protection — Climatek™ coating is ICC-ES AC257 approved for use in pressure-treated lumber and offers excellent resistance for interior and exterior applications.
Key Features & Benefits
  • Hardened steel construction — Delivers high tensile, torque, and shear strength for structural integrity.
  • Integrated washer head — Provides maximum clamping force and a clean, finished appearance with no sharp edges like conventional lag screws.
  • Unique thread design — Pulls substrates together while the washer head ensures tight, gap-free connections.
  • W-Cut™ thread — Lowers installation torque by up to 40% for faster driving and reduced splitting.
  • CEE Thread™ (longer sizes) — Enlarges the hole for the unthreaded shank, allowing wood to settle and increasing holding power.
  • Star Drive recess — Eliminates cam-out and stripping with superior bit engagement.
  • Climatek™ coating — Superior corrosion resistance; code-approved for treated lumber.
  • GRK head markings — Easy identification of genuine GRK fasteners.
Ideal Applications
 
GRK RSS screws are perfect for:
  • Deck ledger boards and substructures
  • Carrying beams and multi-ply assemblies
  • LVL, LSL, and engineered lumber connections
  • Heavy-duty framing and structural remodeling
  • Stair stringers and rails
  • Deck posts and playground equipment
  • Interior and exterior wood-to-wood structural connections
Code Approval & Performance
GRK RSS screws are evaluated and approved for structural applications under ICC-ES ESR-2442. This provides the engineering backing contractors and inspectors require for critical connections in residential and commercial projects. They are also approved for use in pressure-treated lumber.GRK RSS vs. Traditional Lag ScrewsTraditional lag screws require pre-drilling, higher torque, and more time. GRK RSS screws install significantly faster with less effort, reduce the risk of splitting, and provide comparable or superior holding power in a more convenient format — all while meeting modern code requirements.
 
Installation Tips
  • Use a high-torque drill/driver (corded or high-quality cordless recommended for longer screws).
  • #10 and 1/4" RSS use T-25 bit; 5/16" and 3/8" use T-30 bit.
  • Drive straight and steady — the aggressive point and thread design does the work.
  • For very dense woods or specific engineered products, consult the ESR report or perform a test drive.