GRK Fasteners RSS 12221 Structural Screw, 5/16 in Thread, 3-1/8 in L, Washer Head, Star Drive, Steel, 100 PK

GRK's RSSâ„¢ 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. RSSâ„¢ screws that are 3-1/8 in 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 RSSâ„¢ 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 RSSâ„¢ screw in pre-drilled hardware like hinges and connector plates.

Unit: PK100

• Applicable Materials: Wood
• Drive Size: T-30
• Drive Type: Star
• Head Type: Washer
• Length: 3-1/8
• Material: Steel
• Package Quantity: 100 PK
• Shear Strength: 2948 lb
• Tensile Strength: 4247 lb
• Thread Length: 2-1/8 in
• Thread Size: 5/16 in

Application: For interior and exterior use in carrying beams, ledger boards, stair rails, deck posts, playground equipment and other professional applications

MPN: 12221 - UPC: 772691122216