Hex-Head Lag Screws for Specified Heavy Timber Joints and Brackets

Product Information

Lag Screws / Lag Bolts are large wood-thread fasteners with a hexagonal head, a substantial shank and a pointed tip. They engage timber directly rather than a matching nut. Typical specified uses include beam-to-post joints, steel brackets fixed to timber and timber swing-frame connections. Suitability depends on the connection design, timber species and condition, screw dimensions, thread penetration and required loads; this catalogue does not assign a universal load rating.

Prepare a pilot hole for the threaded portion in the receiving timber and the specified clearance hole through the attached member for the unthreaded shank. Hole dimensions and depths must follow the selected screw and connection specification, including timber density, edge and end distances and fastener spacing. A clearance hole is not a full-diameter hole through the timber intended to hold the threads. Fit the specified washer or bearing plate under the head where required by the connection design.

Install by turning the hex head with a correctly sized Socket Wrench or ratchet; use a drill and suitable bits to prepare the holes. Keep the screw aligned and tighten to the specified seating condition without crushing the wood or stripping the threads. Match coating or stainless grade to outdoor exposure and preservative-treated timber where applicable. Bracket bases fixed into concrete need a separately specified anchoring system. Lag screws are also called lag bolts or coach screws, but carriage bolts have a different head and fastening arrangement and are not interchangeable.

Features & Benefits

• HEXAGONAL HEAD - Accepts a correctly sized socket for controlled rotational installation.
• COARSE WOOD THREAD - Engages the receiving timber directly without a matching nut.
• SUBSTANTIAL SHANK - For heavier timber connections when selected by the connection specification.
• PRE-DRILLED INSTALLATION - Separate pilot and clearance-hole requirements support correct engagement and seating.
• BEARING AND EXPOSURE MATCHING - Confirm washers, material and coating for the joint and environment.
• WHOLESALE SPECIFICATION MATCHING - Submit dimensions, drawing or sample and packing requirements for quotation.