#17×16″ CTX T-40 Bronze Construction Lag Screws

#17 x 16″ T-40 Construction Lag Screws

Heavy-Duty Strength for Extreme Structural Applications

The Big Timber CTX™ #17 x 16″ Construction Lag Screws are built to handle the toughest structural demands with ease. These heat-treated, hardened screws are engineered to go beyond the strength of common lag screws, featuring deep-cutting threads for maximum hold and a triple-layer bronze coating for superior corrosion resistance. With an integrated washer head and a smooth T-40 star drive, these lag screws provide a secure, professional finish that’s ready to stand up to the elements.

Key Features of Big Timber CTX™ Lag Screws

• Triple Coating for Maximum Corrosion Resistance
  Rated for up to 1200 hours of corrosion resistance, the triple-coated bronze finish makes these screws ACQ-compatible, ideal for both interior and exterior projects that demand durability.
• Engineered for Superior Grip and Holding Power
  Featuring deep, sharp-cutting threads and an aggressive knurl, these screws are designed to securely draw lumber together while reducing the chance of splitting. The six-lobe star drive offers high torque without cam-out, extending the life of your bit and making installation a breeze.
• Precision Design with Washer Head and Type 17 Tip
  The built-in washer head provides increased pull-through strength, while the Type 17 point offers precise starts with reduced “walking”—no pre-drilling required. Under-head cutting nibs allow for self-countersinking, giving you a flush, professional finish.

Perfect for Structural Projects in Challenging Environments
Ideal for high-stakes applications such as log construction, timber frames, laminated beams, ledger boards, deck posts, SIP panels, and pole barns, these mountain-tested lag screws deliver reliable strength for heavy-duty projects. Certified for compliance with International Building Code and Residential Code standards, these screws are independently tested to perform.

Specifications & Available Quantities

• Available Quantities: 1 piece, 50 pieces, or 250 pieces
• Product Weight: 0.142 lb (individual), 21.59 lb (50ct. box) and 35.7 lb (bulk package)
• Load Capacity: Offers up to 1,850 lbf in tensile strength and 1,240 lbf in shear strength, built to handle heavy loads and demanding conditions

Big Timber Warranty
Big Timber guarantees these lag screws to be free from material and manufacturing defects. If a product is deemed defective, it will be replaced at no cost, though the warranty does not cover labor or installation-related costs.

Recommendation for High-Corrosion Areas
For projects within a mile of saltwater, near swimming pools, or in environments with high exposure to chemicals, Big Timber’s SCTX stainless steel fasteners are recommended to provide additional corrosion protection.

Big Timber CTX™ lag screws are built for those who don’t compromise on quality, giving you the reliability and strength you need to tackle any challenge.

CTX Standard Lag Screw Dimensions

Specifications