Do It 729992 Exterior Deck Screw 3-1/2 in Coarse Thread 1 Lb

Product Description

The DO IT 729992 is a 3-1/2 inch exterior-grade combo drive screw engineered for demanding outdoor fastening applications. Built on a galvanized base with a PrimeGuard Plus coating, these screws deliver high corrosion resistance and a long service life in exposed conditions. The finish color is formulated to blend with treated lumber, making them a natural fit for deck and dock construction. The extra coarse thread pattern reduces wood splitting and friction during installation, while the Type 17 drill tip allows direct drive into wood without pre-drilling. Each box contains 1 pound of fasteners.

These screws are designed for exterior applications including decks, docks, fences, and gazebos. They are compliant for use with treated lumber, including ACQ and CA-treated wood products. The coarse thread geometry provides strong pull-through resistance in dimensional lumber and engineered wood substrates. Typically installed by carpenters, general contractors, and experienced DIYers working on outdoor structures where moisture exposure and wood movement are ongoing concerns.

Key Features

• Galvanized base with PrimeGuard Plus coating for high corrosion resistance
• Type 17 drill tip eliminates the need for pre-drilling
• Extra coarse thread reduces wood splitting and drive friction
• Flat countersinking head sits flush with the work surface
• Finish color blends with treated lumber
• Compliant for use with treated lumber including ACQ and CA treatments

Compatibility

Designed for all exterior wood construction applications including decks, docks, fences, and gazebos using treated or untreated dimensional lumber.

Installation Notes

Installation is typically performed by carpenters or general contractors using a standard drill-driver or impact driver set to an appropriate clutch setting to avoid overdriving. No pre-drilling is required thanks to the Type 17 drill tip, though pilot holes may be advisable near board ends to prevent splitting in dense or narrow stock. Always verify that fastener coating compliance meets local building code requirements when working with pressure-treated lumber.