DEWALT Bi-Flex® Phillips Undercut Flat Head Bi-Metal Self-Drilling Structural Screws – Stalgard® GB Coating – 100/Pack

DEWALT Bi-Flex® Phillips Undercut Flat Head Bi-Metal Self-Drilling Structural Screws deliver the corrosion resistance of 300-series stainless steel with the drilling efficiency of hardened carbon steel. Designed for steel-to-steel, aluminum-to-aluminum, aluminum-to-steel, and wood-to-steel connections, these fasteners feature Stalgard® GB coating for enhanced galvanic compatibility in dissimilar metal applications and increased protection in outdoor or high-moisture environments.
The undercut flat head design provides a flush finish in countersunk holes while preserving full thread engagement. Immune to hydrogen-assisted stress corrosion cracking (HASCC) and tested to ICC-ES standards, these screws ensure high strength, ductility, and reliability in structural applications. Sold in 100-pack quantities for both professional and industrial use.

Key Features

• Phillips undercut flat head design for a flush finish in countersunk holes
• Bi-metal construction: 300-series stainless steel shank/head with hardened carbon-steel drill point
• Stalgard® GB coating for superior corrosion resistance and galvanic compatibility in dissimilar metal applications
• Immune to hydrogen-assisted stress corrosion cracking (HASCC)
• Self-drilling tip eliminates pre-drilling, saving installation time
• Suitable for steel-to-steel, aluminum-to-steel, aluminum-to-aluminum, and wood-to-steel fastening
• ICC-ES approved and tested to AISI S905, AC500, and AC491 standards
• Sold in convenient 100-pack quantities

Applications

• Steel-to-steel connections
• Aluminum-to-steel connections
• Aluminum-to-aluminum connections
• Wood-to-steel connections

Available Head Styles

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

Drill Point Types

• #2 and #3 depending on size and material thickness

Screw Sizes & Thread Options

• Diameters: #12 – 14 and ¼″ – 20
• Thread count: 14–20 TPI
• Length range: 1″ to 4″
• Stalgard® GB coating for corrosion protection and galvanic compatibility
• Bi-metal: 300-series stainless steel shank/head with hardened carbon-steel drill point
• Sold in 100-pack quantities

Product: Bi-Flex® (Phillips Undercut Flat Head) — Bi-Metal Self-Drilling Structural Screws

Material/Corrosion: 300-series stainless corrosion resistance + self-drilling efficiency; suitable for steel and aluminum.

Performance: High strength, ductility, reliability; immune to HASCC (hydrogen-assisted stress corrosion cracking).

Coating: Stalgard® GB for galvanic compatibility in dissimilar-metal connections (incl. aluminum).

Compatibility: 18-8 stainless compatible with pressure-treated lumber.

Applications: Steel-to-steel, aluminum-to-steel, aluminum-to-aluminum, wood-to-steel.

Approvals & Listings: ICC-ES ESR-4367; ICC-ES ESR-4374; compliant with IBC/IRC 2012, 2015, 2018, 2021; 2020 LABC/LARC & 2020 FBC supplements; tested per AISI S905, ICC-ES AC500, ICC-ES AC491.

Typical sizes (with weight & dimensions)

• DFSEBN200 — #12-14 × 1"
  Head Ø 0.415", head height 0.09", Point #2; Max LBL 0.406", Min Protrusion 19/32"; Stalgard® GB; Full Case qty 4,000.
  Approx. box/keg weight: ~31–31.2 lb (4,000 pcs). 
• DFSEBN220 — #12-14 × 1-1/4"
  Head Ø 0.415", head height 0.09", Point #2; Max LBL 0.656", Min Protrusion 19/32"; Stalgard® GB; Full Case qty 2,500.
  Carton weight: ~25 lb (2,500 pcs).
• DFSEBN240 — #12-14 × 1-1/2"
  Head Ø 0.415", head height 0.09", Point #2; Max LBL 0.906", Min Protrusion 19/32"; Stalgard® GB; Full Case qty 2,500.
  Box weight: ~29 lb (2,500 pcs). 
• DFSEBN630 — 1/4"-20 × 3"
  Head Ø 0.48", head height 0.10", Point #3; Max LBL 2.406", Min Protrusion 19/32"; Stalgard® GB; Full Case qty 500.
  Approx. box/keg weight: ~18 lb (500 pcs). 
• DFSEBN640 — 1/4"-20 × 4"
  Head Ø 0.48", head height 0.10", Point #3; Max LBL 3.406", Min Protrusion 19/32"; Stalgard® GB; Full Case qty 500.
  Approx. box/keg weight: ~22 lb (500 pcs).

Q: What makes the DEWALT Bi-Flex® Phillips Undercut Flat Head screw ideal for structural applications?
A: These screws combine a corrosion-resistant stainless steel shank/head with a hardened carbon-steel drill point, ensuring high strength and long-lasting performance.
The undercut flat head provides a flush, clean finish while maintaining full thread engagement.

Q: What is the benefit of the Stalgard® GB coating?
A: Stalgard® GB coating offers superior corrosion protection and enhances galvanic compatibility, making it ideal for connections involving dissimilar metals, such as aluminum-to-steel.
It extends the fastener’s life in outdoor and high-moisture environments.

Q: Where can I use these screws?
A: They are suitable for steel-to-steel, aluminum-to-aluminum, aluminum-to-steel, and wood-to-steel fastening.
They are ICC-ES approved and tested to meet stringent structural performance standards for building codes.