Grip-rite GRSSFW516820 Flat Washer Head Structural Screw

Product Description

The GRIP-RITE GRSSFW516820 is a flat washer head structural screw designed for structural fastening applications in wood framing, connectors, and load-bearing assemblies. Part of the PrimeGuard Plus line, this screw features an integrated flat washer head profile that distributes clamping load across a broader bearing surface, reducing pull-through in structural lumber and engineered wood products. Sold by the box, this fastener is suited for contractors, framers, and structural tradespeople who require consistent, code-compliant fastening performance on the job site.

This structural screw is appropriate for residential and light commercial framing projects where Simpson-style connector plates, ledger boards, rim joists, or similar structural wood connections require rated fasteners. The flat washer head style is commonly specified where conventional hex or round head fasteners are not suitable for the connection detail. Installers working under IRC or IBC structural requirements will find this screw applicable to a range of wood-to-wood and metal-connector fastening tasks.

Key Features

• Flat washer head design increases bearing surface and reduces pull-through in structural lumber
• PrimeGuard Plus coating provides corrosion resistance for treated lumber and exterior applications
• Sold by the box for job-site quantity use
• Designed for structural connections in framing and connector fastening applications

Compatibility

Designed as a structural fastener for wood framing, engineered lumber, and metal connector applications typical of residential and light commercial construction.

Installation Notes

Installation should be performed by a qualified framer or carpenter following applicable IRC or IBC structural fastening requirements. Verify that fastener size and spacing meet the connector or structural engineer specifications for the application. Use an appropriate driver bit matched to the screw head recess to prevent cam-out and ensure full seating. Do not overdrive; the washer head should sit flush to the wood surface without countersinking.