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Strong-Drive® TF WOOD-TO-STEEL Screw 

Strong-Drive® TF WOOD-TO-STEEL Screw

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The Strong-Drive TF Wood-to-Steel screw is a 3" (75 mm) load-rated structural fastener designed to bore through wood and into steel up to 15/32" thick. Its flat head with nibs easily countersinks into the wood and provides excellent pull-through resistance. Its #5 drill point with wings bores through wood before engaging and drilling into the steel member.

Key Features

  • 6-lobe recessed drive for secure driving and longer bit life
  • #5 drill point with wings for boring through wood
  • Flat head with nibs for easy, flush countersinking
  • Self-tapping threads for secure attachments to steel members
  • Available in bulk quantities for hand driving, or collated for Quik Drive® systems
  • Available in black phosphate coating
  • Load rated
  • No predrilling required


  • Wood to steel (maximum recommended thicknesses: 15/32")

Product Includes

  • 50-count model includes (1) driver bit; 1,000-count model includes (2) bits


  • Industry studies show that hardened fasteners can experience performance problems in wet or corrosive environments. Accordingly, use this product in dry, interior and noncorrosive environments only.

Related Links

Related Literature

Product Information Table

Fastener Production Information and Stuff & Things
New products
Model No. Coating/Material Screw Size Length (in.) Head Diameter (in.) Drive Type Head Type Thread Type TPI Max. Grip Length (in.) Point Type Point Size Packaging Qty.
TFP1475R1000 Black Phosphate Coating #14 3 0.460 T30 6-Lobe Flat Head Tapping Threads 14 1.941 Drill Point with Wings 5 1000
TFP1475R50 Black Phosphate Coating #14 3 0.460 T30 6-Lobe Flat Head Tapping Threads 14 1.941 Drill Point with Wings 5 50

Load Tables

TF Wood-to-Steel — Allowable Loads — SPF, DFL, SP Lumber Attached to Steel

(Results are the same per wood species for steel members 1/4" through 15/32" thick)
Model No. Length in. (mm) Nominal Wood Thickness (in.) Wood Species Reference SPF, DFL, SP Allowable Loads (lb.)
Uplift Shear
CD = 1.0 CD = 1.6 CD = 1.0 CD = 1.6
  1. For use with structural steel members from 1/4" up to 15/32" thick.
  2. Minimum steel strength Fu = 45 ksi.
  3. Standard product available in a black phosphate coating.
  4. Reference allowable loads are based on tests using 2x (1.5 in.) thick wood members.
  5. Use increased allowable loads (CD = 1.6) only when resisting wind or seismic forces. Values must be multiplied by all applicable adjustment factors per the NDS.
  6. Minimum fastener spacing requirements to achieve allowable loads: 4" end distance, 1.5" edge distance, 0.75" between staggered rows, 2.5" between non-staggered rows (perpendicular to grain), 1.75" between non-staggered rows (parallel to grain), 1.75" between fasteners in a row (perpendicular to grain), and 4" between fasteners in a row (parallel to grain).
TFP1475 3"
1.5x SPF 190 300 210 335
DFL 260 415 265 425
SP 370 590 300 480

Code Reports & Compliance