SPAX PowerLag T-STAR Washer Head structural wood screw with HCR (High Corrosion Resistant) double-barrier coating for exterior use, including treated lumber. Patented serrated threads eliminate pre-drilling and reduce driving torque by up to 40%, while the built-on washer head eliminates the need for a separate washer. IRC/IBC code compliant (ICC-ES ESR-1783 / DrJ TER No. 1912-07). Ideal for deck ledger attachment, deck framing, treated lumber connections, fence posts, and other structural wood-to-wood applications. 5/16 in. diameter, 3-1/2 in. length, T-40 drive, 12-count package.

Key Features:

• HCR (High Corrosion Resistant) double-barrier coating approved for treated lumber
• No pre-drilling required
• Patented serrated threads reduce driving torque by up to 40%
• Built-on washer head design eliminates need for separate washer
• T-40 drive, compatible with standard bits
• IRC/IBC code compliant, ICC-ES ESR-1783
• 12-count package