GRK's RSS screw is made of specially hardened steel to provide you with high tensile, torque and shear strength. The sharp threads and points bite instantly into the material (including hardwood), reducing the splitting effect due to smaller shanks. RSS screws that are 3-1/8 inch and longer have CEE. Threads which enlarge the screw hole for the non-threaded portion of the fastener, allowing the wood to settle easily and increases the screw’s drawing strength. The CEE thread also reduces the friction on the screw shank which can result in lowering the driving torque and the likelihood of splitting the wood. This is why the RSS screw is an efficient lag screw alternative. Our round head with built-in shield (washer type head) has no sharp edges like conventional lag screws. The added shoulder (nominal diameter) underneath the washer has the ability to center the RSS screw in pre-drilled hardware like hinges and connector plates.
Brand Name: GRK Fasteners
Callout Size: No. 20
Length: 6 in.
Drive Style: Star
Head Type: Washer Head
Thread Type: Self Tapping
Product Type: Structural Screws
Number in Package: 40 pk
Driver Bit Included: No
Color: Yellow
Indoor or Outdoor: Indoor and Outdoor
Diameter: 5/16 in.
Self Drilling: Yes
Finish: Climacoat
Packaging Type: Clamshell
Material: Steel

GRK Fasteners No. 20 X 6 in. L Star Washer Head Self Tapping Structural Screws 40 pk