1/2" x 4" Zinc Plated Hex Large Diameter Concrete Anchor Lag (Box of 25) — Open-Box, 16% Off

CONTRACTOR PACK – Includes (25) heavy-duty large diameter 4 inch concrete screws. The hex washer head is designed for high-torque driving with a standard 3/4" socket, helping deliver a fast, secure, and professional installation in concrete, block, brick, and masonry.

SERRATED HEX WASHER HEAD – Built-in anti-rotation serrations on the underside of the hex washer head help grip the fastening surface and reduce the chance of anchor back-out after installation.

CUTTING THREADS – Aggressive serrated threads are designed to cut into concrete and masonry as the anchor is driven, helping reduce installation torque while creating a strong, secure hold.

ZINC-PLATED FOR RUST PROTECTION – Carbon-steel concrete lag bolt with a protective zinc finish that helps resist corrosion in dry, indoor environments. Offering durability where it matters most.

FAST & CLEAN INSTALLATION – One-piece screw anchor design installs quickly without the separate nuts, washers, or expansion clips required with traditional wedge anchors. The anchor cuts its own threads into the base material for a clean, secure hold.

Take on demanding fastening jobs with confidence using Surge Building Products large diameter concrete screws. Designed for strong, reliable anchoring in concrete, block, brick, and masonry, these heavy-duty screws provide the holding power needed for general construction applications where standard 1/4" concrete screws may not be enough. Each screw is manufactured from carbon steel and finished with zinc plating for added corrosion resistance in dry interior applications. The large diameter design helps deliver a stronger grip and increased load capacity, making these anchors ideal for fastening sill plates, wood framing, ledger boards, racking, equipment, brackets, and other heavy-duty materials to masonry surfaces. The hardened steel threads are engineered to cut into the base material and create a secure mechanical hold without the need for a separate expansion anchor. Simply drill the proper pilot hole, drive the screw into place, and achieve a clean, tight installation with fewer components and faster setup. These zinc-plated masonry screws are a dependable solution for contractors, builders, and maintenance professionals who need a strong concrete fastening option for heavier-duty applications.