FastenMaster HeadLok structural wood screws replace 3/8" lag bolts in wood-to-wood connections, eliminating the need for pre-drilling, wrenching, and washers. The wide, low-profile flat wafer head (0.625" diameter) sits flush and distributes load like a washer, while the aggressive thread profile delivers exceptional withdrawal and holding strength.

• Length: 4-1/2"
• Replaces 3/8" lag bolts - no pre-drilling required
• Flat wafer head installs flush, no washers needed
• Carbon steel with black Ecoat corrosion-resistant coating
• ACQ approved for use in pressure-treated lumber
• Chisel gimlet point for fast, self-starting installation
• ICC-ES ESR-1078 code compliant for structural connections
• Requires T30 TORX drive bit (included with most pack sizes)
• 12 screws per clamshell pack

Applications: doubled 2x dimensional framing, ledger board to rim joist, multi-ply beam fabrication, and stair stringer to header.

Tip: Drive with a high-torque impact driver or corded drill - a standard 12V drill can stall partway through long screws. For installations near board edges, the chisel point reduces splitting but does not eliminate it on dry softwoods; set the screw back 1-1/2 times its diameter from the edge.