Product Details

Strong-Drive® TF WOOD-TO-STEEL Screw

Product Details

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

Available in mechanically galvanized or black phosphate coating
Flat head with nibs for easy countersinking and pull-through resistance
6-lobe recess for secure driving (driver bit in each box; replacement bit model BIT30T-S2-R1)
#5 drill point with wings to bore through wood member
Self-tapping threads to securely fasten into steel member
This screw is also available collated for Quik Drive® auto-feed screw driving systems
Installation Guidelines: Maximum recommended thickness: 1/4" to 15/32"

Applications

Wood to steel (maximum recommended thicknesses: 1/4" to 15/32")

Product Includes

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

Warning

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.

Catalog Pages

Fastener Product Information: C-F-2023 (Fastening Systems), page 116
Fastener Technical Data and Loads: C-F-2023TECHSUP, page 213

Related Literature

Fastening Systems Catalog

C-F-2023

A catalog including new product information as well as any applicable specification and installation instructions for Simpson Strong-Tie® fasteners and Quik Drive® systems.

Catalog

Fastening Systems Technical Guide

C-F-2023TECHSUP

A technical document featuring engineering information for structural fasteners featured in the C-F-2023 Fastening Systems Catalog.

Catalog

Guía técnica de los sistemas de sujeción

C-F-2023TECHSP

Un documento técnico información de ingeniería para los sujetadores estructurales que se incluyen en el C-F-2019SP Catálogo de sistemas de sujeción.

Catalog

Sistemas de sujeción

C-F-2023SP

Catálogo que incluye información sobre productos nuevos y las instrucciones de instalación y especificaciones correspondientes para los sujetadores Simpson Strong-Tie® y los sistemas Quik Drive®.

Catalog

Quik Drive® Wood-to-Steel Solutions

F-Q-PROHSD23

A flier providing current product information, patent numbers and code references for our wood-to-steel fastening solutions.

Flier

Simpson Strong-Tie® Strong-Drive® TFP1475 Wood-to-Steel Screw as an Alternative to a 5/16" Generic Trailer Deck Screw

L-F-TFPSUB23

Simpson Strong-Tie recently tested Strong-Drive® TFP1475 screws (#14-14x3″) as an alternative to 5/16"-18x2½" generic trailer deck screws for attaching wooden planks to steel trailer frames.

Engineering Letter

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.
Footnotes Grip length includes side member, steel thickness, air gap (if any) and allowance for three threads protruding through the steel.
TFP1475R1000	Black Phosphate Coating	#14	3	0.460	T30 6-Lobe	Flat Head	Tapping Threads	14	1.94	Drill Point with Wings	5	1000
TFP1475R50	Black Phosphate Coating	#14	3	0.460	T30 6-Lobe	Flat Head	Tapping Threads	14	1.94	Drill Point with Wings	5	50
TFG1475R1000	N2000® Mechanically Galvanized	#14	3	0.460	T30 6-Lobe	Flat Head	Tapping Threads	14	1.94	Drill Point with Wings	5	1000
TFG1475R50	N2000® Mechanically Galvanized	#14	3	0.460	T30 6-Lobe	Flat Head	Tapping Threads	14	1.94	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
				C_D = 1.0	C_D = 1.6	C_D = 1.0	C_D = 1.6
For use with structural steel members from 1/4" up to 15/32" thick. Minimum steel strength Fu = 45 ksi. Standard product available in a black phosphate coating. Mechanically galvanized (N2000) coating available for additional corrosion protection. Reference allowable loads are based on tests using 2x (1.5 in.) thick wood members. Use increased allowable loads (C_D = 1.6) only when resisting wind or seismic forces. Values must be multiplied by all applicable adjustment factors per the NDS. 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" (75)	1.5x	SPF	190	300	210	335
			DFL	260	415	265	425
			SP	370	590	300	480
TFG1475	3" (75)	1.5x	SPF	190	300	210	335
			DFL	260	415	265	425
			SP	370	590	300	480