The SPAX factor - for the craftsman that concentrates on the details, we work for you. For the pro that puts qualify first, we help you create stronger connections, enhance performance and improve results when your reputation is on the line. This high performance wood screw is not your average screw. Designed for structural wood applications and heated treated to grade 5 durability. It is made with carbon steel and coated for lasting results to fasten strongly and securely. U.S made SPAX is your trusted partner for your fastening needs. Do it Once, Do it Right with SPAX.

Check out our Threads! Our patented thread serration technology allows the screw to be driven faster, reduces splitting in wood, and reduces driving torque by 40 percent. Let the SPAX FACTOR take some of the hassle out of your next project

The ideal replacement for the conventional lag. IRC/IBC Code Compliant: TER-No. 1912-07

True to size thread diameters, grade 5 heat treat, and the washer head style are just some of this fasteners distinct advantages. Tested under the toughest scenarios to give you confidence in every connection

T-Star 6 lobe design is compatible with all industry standard bits and provides superior bit engagement

Fastener length stamp on the head provides convenient identification without measuring and aids on-site inspections

The HCR (High Corrosion Resistant) double barrier coating is tested and recognized for use in ground contact and pressure treated lumber for exterior fresh water general construction applications

Engineered and Manufactured in the USA

SPAX 5/16-in. PowerLags require a T-Star driver bit: T-40 Bit

Common applications: Landscaping timber, deck ledger attachment, fencing, exterior treated lumber, structural wood to wood connections