DeWalt Bi-Flex™ Phillips Pan Head Self-Drilling Metal Screws – Corrosion-Resistant for Metal-to-Metal Applications, 100/Packs

DeWalt Bi-Flex™ Phillips Pan Head Self-Drilling Screws are engineered for superior performance in metal-to-metal applications. These fasteners feature a self-drilling point that eliminates the need for pre-drilling, helping save time on the job. Designed with a hardened steel shank and Bi-Flex™ corrosion-resistant coating, they provide durability and strength in harsh environments. Ideal for HVAC, electrical, and general metal construction projects, these screws deliver consistent drive performance and long-term reliability.

Key Features:

• Self-drilling tip eliminates the need for pilot holes
• Bi-Flex™ coating offers superior corrosion resistance
• Hardened steel shank ensures strength and durability
• Engineered for secure metal-to-metal fastening
• Pan head with Phillips drive provides a clean, flush finish
• Ideal for use in HVAC, electrical work, and general metal construction

Applications

• Steel-to-steel connections
• Aluminum-to-steel or aluminum-to-aluminum fastening
• Fastening dissimilar metals where corrosion resistance is required
• General metal construction and fabrication

Bi-Flex® screws are bi-metal self-drilling tapping screws designed to combine the corrosion resistance of 300-series stainless steel with the speed of drill screws. Suitable for use in both steel and aluminum.

Available Head Styles

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

Drill Point Types

• Self-drilling points matched to material thickness (selection varies by size)
• Common point options within the Bi-Flex® line include #2 and #3; heavier-gauge offerings may include higher numbers

Refer to the DEWALT technical data/size chart for exact drill-point per diameter/length.

Screw Sizes & Thread Options

• Multiple diameters and lengths available (listed under this parent item)
• Self-drilling tapping threads for metal-to-metal fastening
• 300-series stainless steel shank/head with hardened carbon-steel drill point (bi-metal construction)
• Sold in 100-pack quantities

Exact diameter, length and thread specs vary by SKU; see the DEWALT size chart and the variant table below.

Type / material: Bi-metal self-drilling/tapping structural screws — 300-series stainless body with hardened drill tip

Head / drive: Phillips pan head (typical #2 Phillips drive for #8/#10)

Corrosion protection: Stalgard® GB coating for superior galvanic compatibility (great for dissimilar metals incl. aluminum)

Performance: High strength, ductility, and reliability; immune to HASCC

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

Approvals (family): ICC-ES ESR-4367, ESR-4374; tested per AISI S905, AC500 (misc. to steel), AC491 (aluminum)

Size-specific (dimensions, pack, and estimated box weight)

• DFSEAX100 — #8-18 × 3/4″, Point #2
  Head Ø 0.315″ · Head H 0.110″ · Max load-bearing 0.156″ · Min protrusion 19/32″ · Finish: Stalgard® GB · Full Case qty 5,000
  Approx. box weight: ~30–38 lb (varies by supplier/pack materials)
• DFSEAX110 — #10-16 × 3/4″, Point #2
  Head Ø 0.365″ · Head H 0.130″ · Max load-bearing 0.250″ · Min protrusion 1/2″ · Finish: Stalgard® GB · Full Case qty 5,000
  Approx. box weight: ~34–42 lb
• DFSEAX120 — #10-16 × 1″, Point #2
  Head Ø 0.365″ · Head H 0.130″ · Max load-bearing 0.500″ · Min protrusion 1/2″ · Finish: Stalgard® GB · Full Case qty 5,000
  Approx. box weight: ~38–46 lb

Notes:
• Dimensions (head diameter/height, max load-bearing, min protrusion), finishes, and pack quantities come from your table.
• Weights are practical shipping ranges based on typical 5,000-count cartons for #8/#10 pan-head drill screws; exact weight may vary with packaging and vendor.

Q: What makes Bi-Flex® “bi-metal”?
A: A 300-series stainless body for corrosion resistance paired with a hardened self-drilling tip for fast drilling.

Q: Why choose the Phillips pan head version?
A: The pan head gives a wide bearing surface and low-profile finish; installs with a common #2 Phillips drive.

Q: Is it corrosion-resistant?
A: Yes—Stalgard® GB coating improves corrosion resistance and galvanic compatibility for dissimilar-metal connections.

Q: What sizes and materials does it cover?
A: Listed sizes include #8-18 × 3/4″ and #10-16 × 3/4″, 1″; suitable for steel-to-steel, aluminum-to-steel, aluminum-to-aluminum, and wood-to-steel.