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5/16 x 5-1/8-Inch Rugged Structual Screw Star Drive Low Profile Washer Head, 20-Pack
- Mfg.#
- GRK14231
- Sku#
- 1800564
- Recessed star drive for zero stripping, with six points of contact
- CEE THREAD™ enlarges hole to reduce splitting
- W-CUT™ for low torque, faster drive
- ZIP-TIP™ ensures no pre-drilling and faster penetration
- Washer head for immense holding power
* Estimated stock levels as of Fri, Apr 10, 2026. All items subject to prior sale. Prices may vary between stores and online. Please call ahead to confirm availability of items marked as Limited Stock.
Description
GRK's RSS™ rugged structural 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 which are 3-1/8 in and longer have a six threaded CEE thread that enlarges the screw hole for the non-threaded portion of the fastener, allowing the wood to settle easily and increasing 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.
Specifications
General
| Applicable Materials | Treated Lumber |
|---|---|
| Head Type | Washer |
| Shear Strength | 2948 lbf |
| Tensile Strength | 4247 lbf |
| Thread Length | 3-1/2 in |
| Type | Rugged |
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