Midwest Tool 35003 Lag Screw 5/16 in X 1-1/2 in Hex Drive 20 Pack

Product Description

The MIDWEST TOOL 35003 is a zinc plated steel lag screw designed for heavy-duty fastening applications in wood and masonry construction. At 5/16 inch in diameter and 1-1/2 inches in length, this lag screw features a hexagonal head that accepts a standard socket or wrench for high-torque installation. Lag screws differ from standard wood screws in their larger body diameter and hex-drive head, making them suitable for structural connections that require a secure, lasting hold. Each package contains 20 screws.

This lag screw is used in residential and commercial construction and trade service work where heavy timbers, lumber assemblies, or wood-to-masonry connections require a reliable threaded fastener. Common applications include framing tie-ins, ledger board attachment, beam connections, and structural wood assemblies. The zinc plating provides a basic level of corrosion resistance suitable for interior and dry exterior environments. Carpenters, general contractors, and trade professionals working on structural installs will find this a standard stocking fastener.

Key Features

• 5/16 inch diameter by 1-1/2 inch length for medium-duty structural fastening
• Hex drive head accepts standard sockets and wrenches for high-torque installation
• Steel construction with zinc plating for corrosion resistance
• Suitable for wood-to-wood and wood-to-masonry applications
• Sold in a 20-piece pack for convenient jobsite stocking

Compatibility

Designed as a standard hex-head lag screw for use in wood framing, timber connections, and wood-to-masonry fastening applications where a 5/16 inch diameter fastener is specified.

Installation Notes

Installation is typically performed by carpenters, general contractors, or licensed trade professionals using a socket wrench or impact driver with the appropriate hex socket. Always pre-drill a pilot hole sized to the shank and thread diameter to prevent wood splitting and reduce installation torque. Follow applicable building code requirements, including IRC or IBC fastener specifications, when using lag screws in structural applications. Do not overtighten, as this can strip the wood fibers and reduce holding strength.

Technical Specifications

• Diameter: 5/16 inches
• Length: 1-1/2 inches
• Drive Type: Hex
• Head Type: Hex
• Material: Steel
• Finish: Zinc Plated
• Quantity: 20 pieces
• Country of Origin: China

Standard Information

• Brand: MIDWEST TOOL
• Manufacturer Part Number: 35003