Fastenmaster FMHLGM278-50 Structural Screw 50 Count

Product Description

The FASTENMASTER FMHLGM278-50 is a wafer head structural screw designed for load-bearing wood and OSB fastening applications. Each screw measures 0.172 inches in diameter and 2-7/8 inches in length, providing shear values that exceed those of standard 3/8-inch lag screws. The wafer head design eliminates the need for a separate washer while delivering increased pull-through strength. A chamfer under the head further reinforces the connection at the fastening surface. A Spider Drive bit is included in every box, enabling high bit engagement and consistent drivability without cam-out. This screw is suited for installation by carpenters, framers, and structural trades working with dimensional lumber and engineered wood panels.

These structural screws are used in residential and light commercial framing, ledger board attachment, deck construction, and other applications where a high-strength mechanical fastener is required into wood or OSB substrates. The sharp gimlet point allows for fast starts without pre-drilling in most wood applications, reducing installation time. The aggressive thread profile enhances both holding strength and withdrawal resistance, making these screws appropriate for connections subject to shear and tension loads.

Key Features

• Shear values exceeding standard 3/8-inch lag screws for structural-grade performance
• Sharp gimlet point for fast, self-starting installation into wood and OSB
• Aggressive thread profile for high holding and withdrawal strength
• Wafer head eliminates the need for a washer and improves pull-through resistance
• Chamfer under head increases bearing strength at the fastening surface
• Spider Drive recess provides maximum bit engagement and reduces cam-out
• Spider Drive bit included in every box

Compatibility

Designed for structural fastening into dimensional lumber, engineered lumber, and OSB in residential and light commercial framing and decking applications.

Installation Notes

Installation should be performed by a qualified carpenter, framer, or structural contractor familiar with applicable building codes. Always verify that fastener spacing and embedment depth comply with project structural drawings and local code requirements before driving screws. Use the included Spider Drive bit or a compatible Spider Drive driver bit to ensure full engagement and avoid stripping the recess. No pre-drilling is required in most wood substrates, but pilot holes may be needed near board edges to prevent splitting.

Technical Specifications

• Diameter: 0.172 inches
• Length: 2-7/8 inches
• Drive Type: Spider Drive
• Head Style: Wafer Head
• Point Type: Gimlet Point
• Compatible Substrate: Wood, OSB
• Quantity: 50 per box
• Weight: 1.759 pounds
• UPC: 00608309410577

Standard Information

• Brand: FASTENMASTER
• Manufacturer Part Number: FMHLGM278-50