GRK RSS 5/16 in x 3-1/8 in Rugged Structural Screws are engineered for high-strength structural connections. Designed to replace lag screws in many applications, these fasteners provide exceptional holding power with faster installation and less effort. The washer head delivers increased bearing surface for secure clamping, while the star drive head reduces cam-out and stripping.

The Climatek coating offers advanced corrosion resistance for exterior use and pressure treated lumber. The sharp point and aggressive thread design help reduce splitting and often eliminate the need for pre-drilling. The 25 count pack is ideal for deck ledgers, posts, beams, and other structural connections where strength and reliability matter.