#17×8″ CTX T-40 Bronze Construction Lag Screw

#17 x 8″ Construction Lag Screws

Engineered for Strength, Designed for Precision

Big Timber’s CTX™ #17 x 8″ Construction Lag Screws are built for professionals who demand superior strength and reliability in every project. Heat-treated and hardened for maximum durability, these screws outlast and outperform ordinary lag screws. With deep-cutting threads for powerful hold and a Type 17 tip for quick, accurate starts, these screws are crafted for clean, hassle-free installation. A built-in washer head adds pull-through strength and a polished, professional finish.

Why Choose Big Timber CTX™ Lag Screws?

• Triple-Layer Bronze Coating for Unmatched Corrosion Resistance
  Featuring a triple-layer bronze finish, these screws are ACQ-rated, providing up to 1200 hours of protection in both ACQ and salt spray conditions—perfect for both interior and exterior use.
• Exceptional Grip and Holding Power
  Engineered with deep, wide threads and aggressive knurling, these screws grip firmly and reduce splitting. The T-40 star drive minimizes cam-out and extends bit life, ensuring consistent torque during installation.
• Precision and Ease with a Washer Head and Type 17 Tip
  The integrated washer head provides added pull-through strength and a smooth finish, while the Type 17 point ensures fast, precise starts with minimal “walking” and eliminates the need for pre-drilling. Under-head cutting nibs support self-countersinking for a flush fit.

Perfect for Heavy-Duty Structural Applications
Ideal for structural projects such as log construction, timber framing, laminated beams, ledger boards, stair rails, deck posts, SIP panels, and pole barns, these lag screws are designed to excel in demanding conditions. Tested to meet International Building Code and Residential Code standards, they are proven for reliable performance in any environment.

Specifications & Available Quantities

• Available Quantities: 1 piece, 25 pieces, 100 pieces, or 250 pieces
• Product Weight: 0.094 lb (single screw), also available in 2 lb, 10 lb, and 25.2 lb bulk packages
• Dimensions: 0.310″ thread diameter with a T-40 star drive for secure, high-torque installations

Big Timber Warranty
Big Timber ensures its products are free from defects in material and manufacturing. Any defective product will be replaced at no cost. Note that labor and installation costs are not covered by this warranty.

Corrosion Protection for Extreme Conditions
For projects near saltwater, pools, or high-corrosion areas, Big Timber’s SCTX stainless steel fasteners are recommended to provide maximum durability.

Big Timber CTX™ lag screws are built to offer the reliable, professional-grade strength that builders trust, making them the superior choice for any challenging construction task.

Dimensions

Specifications