The Simpson Strong-Tie TBP1475R50 Strong-Drive TB Wood-to-Steel Screw with black phosphate coating is designed for high-performance fastening of wood to steel in interior, dry environments. This structural screw features a flat head with under-head nibs for clean countersinking, a #4 drill point with wings to eliminate wood splitting, and a 6-lobe recess for controlled driving torque. The black phosphate finish provides smooth driving and a clean appearance for indoor structural applications where corrosion is not a concern.

Key Features

• Black phosphate coating for dry, interior use
• Flat head with nibs for precise, flush countersinking
• #4 drill point with wings for fast, clean boring through wood and into steel up to 1/4 inch thick
• 6-lobe (T-style) drive reduces cam-out and supports efficient, consistent installation
• Available in collated or hand-drive versions for jobsite or production line use

Applications

Ideal for fastening wood nailers, sleepers, subflooring, and other wood assemblies to steel framing in non-corrosive interior environments. Commonly used in commercial construction, trailer manufacturing, and modular building applications where strength and installation speed are priorities.

Installation

No pre-drilling is typically required. Use a compatible 6-lobe drive bit and drive the screw until the flat head sits flush or slightly recessed in the wood surface. The integrated wings bore out the wood and break off upon steel contact, allowing the #4 point to engage steel cleanly. For bulk installations, collated options are available for use with compatible auto-feed screwdrivers.