Simpson Strong-Drive TB Wood-to-Steel Screw, #12 x 1-3/4", Black Phosphate is a structural fastener engineered by Simpson Strong-Tie for reliable wood-to-metal connections in dry, interior, and noncorrosive environments. Designed to fasten wood securely to steel up to 1/4 in. thick, this screw combines a self-drilling drill point with tapping threads to deliver fast, clean installation without pre-drilling. The black phosphate finish provides a professional appearance suited to interior structural applications, and the flat head with nibs allows flush, countersunk seating without extra effort.

Key Features

• Flat head with nibs for countersinking - the nibs cut into the wood surface automatically as the screw drives, producing a clean, flush finish without a separate countersink step and saving installation time.
• T30 6-Lobe (Torx) drive type - the 6-lobe recess transfers torque more efficiently than square or Phillips drives, reducing cam-out during installation and keeping the driver bit engaged even under high load.
• #4 drill point with wings - the drill point pierces steel without pre-drilling, while the wings ream the wood hole to the correct diameter before the threads engage steel, preventing wood splitting and ensuring a tight connection.
• Tapping threads at 14 TPI - the coarse tapping thread pitch is optimized for biting into steel up to 1/4 in. thick, creating a strong mechanical interlock without the need for a pre-tapped hole.
• Black phosphate coating - provides surface protection appropriate for dry, interior, or noncorrosive environments while reducing friction during installation for smoother driving.
• Structurally engineered and extensively tested - designed and validated by Simpson Strong-Tie to meet the demands of wood-to-metal structural fastening, giving contractors and builders confidence in joint integrity.
• Driver bit included - a compatible T30 driver bit is included, so installation can begin immediately without sourcing separate tooling.

Why This Product

• Purpose-built for wood-to-steel fastening in interior structural applications - unlike general-purpose screws, the TB screw's drill point, wing geometry, and tapping threads are all optimized specifically for penetrating steel up to 1/4 in. thick while maintaining a firm grip in the wood member above.
• Eliminates pre-drilling and countersinking steps - the combined #4 drill point with wings and flat head with nibs handle both operations in a single pass, reducing labor and the number of tools needed on the job.
• Engineered by Simpson Strong-Tie for structural confidence - this fastener is not a general hardware screw; it is tested and rated for structural wood-to-metal connections, making it appropriate where joint strength and load transfer matter.
• Comes ready to install - a T30 6-lobe driver bit is physically included, so crews can get to work right away without digging through a toolbox for a compatible bit.

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #12
• Length: 1-3/4 in.
• Head Type: Flat Head
• Head Diameter: 0.390 in.
• Shank Diameter: 0.175 in.
• Drive Type: T30 6-Lobe
• Thread Type: Tapping Threads
• TPI: 14
• Point Type: Drill Point with Wings
• Point Size: 4
• Max. Grip Length: 1.06 in.
• Coating/Finish: Black Phosphate Coating
• Approx. Count Per Lb: 86
• Country of Origin: Taiwan

Available Pack Options

• TBP1245R50: 50 Pk - includes Driver bit included
• TBP1245R2000: 2000 Pk - includes Driver bit included

Frequently Asked Questions

What is the maximum steel thickness this screw can fasten into?

The Simpson Strong-Drive TB Wood-to-Steel screw is rated for steel up to 1/4 in. thick. Using the screw in steel thicker than this maximum recommended thickness is outside the designed application range.

Do I need to pre-drill holes in the steel before installing this screw?

No. The #4 drill point with wings is designed to self-drill through steel without pre-drilling. The wings also ream the wood hole as the screw drives through, allowing a clean, single-step installation process.

Can this screw be used in outdoor or wet environments?

No. The black phosphate coating is intended for dry, interior, or noncorrosive environments only. This screw should not be used in outdoor, wet, or corrosive conditions.

What drive bit does this screw require?

This screw uses a T30 6-Lobe (Torx-style) drive. A compatible driver bit is physically included with your order, so no additional bit purchase is necessary to get started.