Hillman Fasteners 47874 Lag Screw 5/16x2.5in 175 Pack

Product Description

The HILLMAN FASTENERS 47874 is a 175-count pack of 5/16-inch by 2.5-inch construction lag screws engineered for demanding outdoor structural applications. Each screw features a patented cross-cut thread design and a wood-biting cut point that work together to reduce the risk of wood splitting during installation. The cross-cut threads grind and remove wood fibers from the hole rather than compressing them, while the cam-out-resistant drive geometry delivers a smooth, controlled drive. These screws are rated for use with pressure-treated lumber, making them a practical choice for exterior structural connections where moisture resistance is required.

These lag screws are intended for residential and light commercial outdoor construction including decks, stairs, and playsets. The 5/16-inch diameter and 2.5-inch length suit mid-range structural connections where a standard wood screw lacks the shear strength required. Carpenters, general contractors, and experienced DIYers working on framing, ledger boards, and post-to-beam connections will find this pack sized appropriately for larger jobs. The 175-count quantity reduces the need for multiple supply runs on multi-day projects.

Key Features

• Patented cross-cut threads reduce wood splitting by grinding and removing fibers from the hole
• Wood-biting cut point improves bite and reduces cam-out during drive
• Compatible with pressure-treated lumber for exterior and ground-contact applications
• 5/16-inch by 2.5-inch dimensions suited for mid-range structural fastening tasks
• 175-count pack supports large-scale decking, stair, and playset builds

Compatibility

Designed for use with pressure-treated lumber in outdoor structural applications including decks, stairs, and playsets. Suitable for use anywhere a 5/16-inch by 2.5-inch lag screw is specified.

Installation Notes

Lag screws of this diameter are typically installed by carpenters or general contractors using a impact driver or socket wrench with the appropriate hex drive. Always pre-drill a pilot hole sized to the shank diameter to prevent splitting, particularly in dense or dry lumber. Follow local building codes, including IRC framing requirements, when fastening structural members such as ledger boards or deck framing. Do not overdrive — seat the screw head flush to the wood surface without countersinking unless the application requires it.