DeWALT Bi-Flex® Phillips Flat Head with Wings Bi-Metal Self-Drilling Structural Screws - 100/Pack

DEWALT Bi-Flex® Phillips Flat Head with Wings screws are bi-metal self-drilling structural fasteners designed for efficient wood-to-metal installations. Featuring a corrosion-resistant 300-series stainless-steel shank and head paired with a hardened carbon-steel drill point, these screws deliver long-lasting performance in outdoor and high-moisture environments. The integrated cutting wings create clearance holes through wood or composite materials before breaking off as the drill point engages metal, preventing separation of materials and ensuring a flush, countersunk finish. Ideal for construction, framing, sheathing, and mixed-material applications, these fasteners eliminate the need for pre-drilling and are sold in convenient 100-pack quantities.

Key Features

• Phillips flat head with wings for flush, countersunk finish in wood-to-metal fastening
• Bi-metal construction: 300-series stainless-steel shank/head with hardened carbon-steel drill point
• Self-drilling tip eliminates pre-drilling for faster installation
• Cutting wings bore through wood or sheathing to prevent “jacking” before engaging metal
• Corrosion-resistant for outdoor and high-moisture environments
• Sold in 100-pack quantities

Applications

• Wood-to-metal fastening
• Attaching plywood or sheathing to metal framing
• Aluminum-to-steel or aluminum-to-aluminum fastening
• Mixed-material construction where corrosion resistance is required

Available Head Styles

• Phillips Flat Head with Wings (this page)
• Hex Washer Head
• Phillips Pan Head
• Phillips Undercut Flat Head
• Phillips Pancake Head

Drill Point Types

• #3 and #5 – depending on size
• Wings for wood-to-metal applications

Screw Sizes & Thread Options

• #10 to ¼″ Diameter
• Thread count: 14–24 TPI
• Length: 1½″ to 2⅝″

Bi-metal self-drilling structural screw — Corrosion resistance of 300-series stainless with the drilling efficiency of a self-drilling screw; suitable for steel and aluminum.

Phillips flat head with wings — Countersinks flush; wings clear material and prevent premature thread engagement until base metal is reached.

High strength, ductility, reliability — Immune to hydrogen-assisted stress corrosion cracking (HASCC).

Stalgard® GB coating — Greater galvanic compatibility for dissimilar metals (incl. aluminum); higher corrosion resistance than carbon steel and 410 stainless fasteners.

18-8 stainless compatible — Suitable for use with pressure-treated lumber.

Applications — Steel-to-steel, aluminum-to-steel, aluminum-to-aluminum, and wood-to-steel connections.

Approvals & Listings

• ICC-ES ESR-4367; ICC-ES ESR-4374
• Complies with IBC/IRC 2012, 2015, 2018, 2021
• 2020 LABC/LARC and 2020 FBC ICC-ES Report Supplements
• Tested per AISI S905, ICC-ES AC500 (Misc. Building Materials to Steel), and ICC-ES AC491 (Use in Aluminum)

Typical sizes offered

• #10-16 × 1-1/2″ — Point #3; nominal head Ø 0.37″; max load-bearing length 0.813″; min protrusion 11/16″; finish Stalgard® GB; Full Case qty 3,500.
• #12-24 × 2-13/16″ — Point #5; nominal head Ø 0.415″; max load-bearing length 1.563″; min protrusion 1-1/4″; finish Stalgard® GB; Full Case qty 1,000.
• 1/4″-20 × 2-13/16″ — Point #5; nominal head Ø 0.48″; max load-bearing length 1.563″; min protrusion 1-1/4″; finish Stalgard® GB; Full Case qty 1,000.

Q: Why choose DEWALT Bi-Flex® Phillips Flat Head with Wings for wood-to-metal fastening?
A: These bi-metal self-drilling structural screws combine a corrosion-resistant 300-series stainless-steel shank/head with a hardened carbon-steel drill point for fast penetration.
The flat head seats flush, and the self-drilling tip eliminates pre-drilling—ideal for attaching sheathing or plywood to steel framing.

Q: What do the “wings” do—and do they break off?
A: The cutting wings create a clearance hole through wood or composite so the material doesn’t “jack” away from the substrate.
As the drill point reaches the metal, the wings shear off, allowing the threads to engage the steel securely for a tight, flush connection.

Q: How do I pick the right size and drill-point?
A: Match screw length and point to the total thickness of your assembly.
For wood-to-steel, #10–#12 or 1/4″ diameters with #3 or #5 points (with wings) are common.
Use longer lengths for thicker stacks so threads fully engage without over-penetration; check the size chart for exact combinations by diameter and gauge.