For over 20 years, GRK has produced contractor-grade fasteners for professional use, incorporating innovative design features to make screws that are faster and easier to drive, hold better in wood, plastic and composite materials, and reduce the risk of splitting.
These screws all have Torx heads (and are supplied with a matching Torx bit) to reduce the potential for cam-out and slippage in the drive. They have a rust-resistant Climatek coating that won't react with treated.
Made of hardened steel for high torque and shear strength, these are GRK's toughest screws, highly recommended for load-bearing applications. Self-tapping tips eliminate need for pre-drilling; sawtooth-like ridges on threads near the tip reduce friction and driving effort. Secondary threads enlarge the upper portion of the hole slightly so the Torx-drive screw seats snugly with less torque. The broad, washer-style head spreads the bearing surface over a large contact area, improving hold. A small bevelled shoulder under the head helps the screw seat squarely in hinges and other hardware.