5/16 In. In. X 4 In. L Star Hex Head W-Cut Structural Screws

GRK RSS structural screws are engineered fasteners made of specially hardened steel designed to deliver high tensile, torque, and shear strength for demanding construction and renovation projects. These screws feature sharp threads and points that bite instantly into materials, including hardwood, making them an efficient lag screw alternative for deck construction, ledger board installation, and other heavy-duty applications where reliability and performance are essential.

The 5/16 x 4-inch size with washer head design provides a secure, flush connection while minimizing gaps between materials. The built-in shield head eliminates sharp edges found on conventional lag screws, and the shoulder underneath centers the screw in pre-drilled hardware like hinges and connector plates. Ideal for both professional contractors and DIY enthusiasts, this 400-pack offers the quantity needed for larger projects.

Features and Benefits

• CEE Thread Technology: Available on screws 3-1/8 inches and longer, CEE threads enlarge the screw hole for the non-threaded portion, allowing wood to settle easily and increasing drawing strength while reducing friction and driving torque.
• Reduced Splitting: The sharp points and specially hardened steel construction, combined with smaller shanks and CEE geometry, significantly reduce the splitting effect in wood materials.
• Self-Drilling and Self-Tapping: The sharp point eliminates the need for pre-drilling in many applications, allowing for quick and efficient installation.
• Washer Head Design: The built-in washer head minimizes material gaps and provides a flush, stable connection without sharp edges.
• High Tensile Strength: Engineered to withstand high torque and shear forces, delivering professional-grade performance in structural applications.

Specifications

• Brand: GRK Fasteners
• Model: RSS 10225
• Thread Size: 5/16 inch
• Length: 4 inches
• Head Type: Washer Head
• Drive Type: Star Drive
• Material: Steel, specially hardened
• Pack Quantity: 400 screws