9 x 3 in. Big T Trim Head Wood Screw, Coated, Trim Head, T-20, Bronze

9 x 3 in. Big T Trim Head Wood Screws, Bronze

Big T Exterior Corrosion-Resistant Trim Head Wood Screws are designed for reliable fastening in interior and exterior wood construction, remodeling, and repair applications. These coated wood screws feature heat-treated hardened steel for high tensile and shear strength, along with a triple-layer ACQ-compatible Bronze coating for added corrosion resistance. The trim head design provides a clean, low-profile appearance while the self-countersinking head helps create a finished installation.

The deep six-lobe T-20 star drive provides excellent bit engagement, helping reduce cam-out and allowing higher driving torque than traditional Phillips or square-drive screws. A precision-cut knurl enlarges the entry hole to reduce splitting and drag while helping draw lumber tightly together. V-cut thread notches cut through wood fibers for easier insertion at lower driving torque, while the Type 17 tip promotes fast, accurate starts and helps prevent the screw from walking.

Benefits & Features

• Heat-treated hardened steel provides high tensile strength and high shear strength.
• Triple-layer ACQ-compatible Bronze coating is suitable for many interior and exterior wood applications.
• Deep six-lobe T-20 star drive helps reduce cam-out and improves driving control.
• Star drive design handles significantly higher torque than Phillips or square-drive screws while helping extend bit life.
• Under-head cutting nibs help the trim head self-countersink into wood.
• Precision-cut knurl enlarges the hole to reduce splitting and drag while helping draw lumber together.
• V-cut thread notches cut wood fibers for easier insertion at lower torque.
• Type 17 tip provides faster, more precise starts and helps eliminate screw walking.
• Designed for easier insertion without pre-drilling in many wood applications.
• Aggressive thread design provides strong withdrawal strength.
• Low-profile trim head creates a clean, finished appearance.
• Head diameter measures approximately 0.24 in.
• Also available with ACQ-compatible Bronze or Bronze coatings in applicable sizes.

Common Applications

• Exterior and interior wood framing
• Exterior trim boards
• Window and door installation
• Decks and rails
• Siding
• Roofing
• Porches
• Fencing
• General construction, remodeling, and repair

Corrosion-Resistance Considerations

Big T coated exterior wood screws are compatible with treated lumber for many applications. However, areas within one mile of saltwater, near swimming pools, locations exposed to corrosive chemicals, livestock confinement areas, and other highly corrosive environments may require stainless steel fasteners of the appropriate size, grade, and type. Big T Stainless Steel Fasteners should be considered where available and appropriate for the application.

Important: Always follow the lumber manufacturer's recommendations for fastener selection and installation.