Fastenmaster FMFL634-50 Flatlok Structural Wood Screw 50 Count

Product Description

The FASTENMASTER FMFL634-50 is a FlatLok engineered structural wood screw sold in a 50-count box, designed for multi-ply dimensional and engineered wood connections. At 6-3/4 inches in length, the screw features a flat head profile that sits flush with the work surface, making it compatible with drywall and trim finishing over the fastened assembly. The included Torx ttap drive bit reduces the risk of cam-out and stripping during installation. No pre-drilling is required, and the fastener carries ACQ approval for use with treated lumber. Corrosion resistance is guaranteed, and the product is code compliant for structural applications.

FlatLok screws are used in residential and light commercial framing and structural wood assemblies where multi-ply beams, headers, posts, or engineered lumber components must be mechanically fastened. The approved single-sided installation method allows a contractor or carpenter to complete the connection from one face without needing access to the back side of the assembly. This is particularly useful in tight framing situations, retrofit structural work, or when fastening LVL beams, glulam members, or multi-ply dimensional lumber in floor, roof, and wall systems.

Key Features

• 6-3/4 inch length engineered for structural multi-ply wood connections
• Flat head design allows drywall or trim to be applied directly over fastener
• Approved for single-sided installation, no back-side access required
• No pre-drilling required, reducing labor time on structural assemblies
• Torx ttap bit included to minimize bit stripping during installation
• ACQ approved and guaranteed corrosion resistant for use with treated lumber

Compatibility

Designed for use in multi-ply dimensional and engineered wood connections including applications requiring code-compliant structural fasteners approved for ACQ treated lumber.

Installation Notes

Installation is typically performed by a licensed carpenter, framing contractor, or structural installer following applicable building code requirements. No pre-drilling is required, but fastener placement should follow the approved fastening schedule for the specific structural connection. Verify that the correct Torx ttap bit is seated fully before driving to avoid cam-out. Always follow the project engineer or building code authority specifications for fastener spacing and load requirements.

Technical Specifications

• Length: 6-3/4 inches
• Drive Type: Torx ttap
• Head Style: Flat
• Application: Multi-ply dimensional and engineered wood connections
• ACQ Approved: Yes
• Pre-Drilling Required: No
• Quantity: 50 per box
• Weight: 4.65 pounds
• UPC: 00608309429166

Standard Information

• Brand: FASTENMASTER
• Manufacturer Part Number: FMFL634-50