DeWALT Dril-Flex® Self-Drilling Metal Screws – PUF Head | Stalgard® Coated Fasteners for Metal-to-Metal Applications, 100/Packs

Dril-Flex® Self-Drilling Structural Screws combine dual heat treatment with a self-drilling, self-tapping design to deliver the strength, ductility, and resistance to embrittlement required for critical connections. The Phillips undercut flat head seats flush where clearance matters and provides a clean, low-profile finish. Stalgard® coating improves corrosion resistance and galvanic compatibility in dissimilar-metal applications, while the hardened drilling point and lead threads speed installation. Engineered to reduce the risk of hydrogen-assisted stress corrosion cracking, Dril-Flex screws are a reliable choice for façade, glazing, and solar assemblies.

Key Features

• Dual heat-treated structure for high strength and ductility in structural applications
• Hardened drilling point & lead threads for fast, consistent self-drilling/tapping
• Lower-hardness load-bearing section helps reduce HASCC vs. case-hardened fasteners
• Phillips undercut flat head for flush seating and added clearance in tight assemblies
• Stalgard® corrosion protection; enhanced galvanic compatibility in dissimilar-metal connections
• ICC-ES recognized (per Dril-Flex family reports) for code compliance across multiple IBC/IRC cycles

Applications

• Curtain walls
• Rainscreen
• Window walls / glazing
• Solar panel systems

Available Head Styles

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

Drill Point Types

• #3 and #4, depending on screw size and base-material thickness

Screw Sizes & Thread Options

• Diameters: #12 and 1/4″
• Thread count: 14 TPI and 20 TPI
• Length range: 1″ to 4″
• Typical drive: #3 Phillips (per item sizes listed)

Product type: Dual heat-treated, self-drilling/tapping structural screws for critical connections; engineered for strength, ductility, and resistance to embrittlement. 

Head / drive: Phillips Undercut Flat Head (82° head angle), #3 Phillips drive. 

Corrosion protection: Stalgard® coating for enhanced corrosion resistance and galvanic compatibility. 

Applications: Curtain walls, rainscreen, window walls/glazing, solar panel systems. 

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

• DFSEBL215 — #12-14 × 1″ (Point #3) Max load-bearing length 0.500″ · Min protrusion 1/2″ · Nominal head Ø 0.415″ · Head height 0.09″ · Pack: 4,000 Approx. box weight: ~36 lb (scaled from 0.9 lb per 100).
• DFSEBL220 — #12-14 × 1-1/4″ (Point #3) Max load-bearing length 0.750″ · Min protrusion 1/2″ · Nominal head Ø 0.415″ · Head height 0.09″ · Pack: 3,000 Approx. box weight: ~29–30 lb (estimate) — extrapolated from the #12-14 × 1″ weight above, adjusted for added length. 
• DFSEBL223 — #12-14 × 1-1/2″ (Point #3) Max load-bearing length 1.000″ · Min protrusion 1/2″ · Nominal head Ø 0.415″ · Head height 0.09″ · Pack: 2,500 Box weight: 25 lb / 2,500. 
• DFSEBL330 — 1/4″-20 × 3″ (Point #4) Max load-bearing length 2.188″ · Min protrusion 13/16″ · Nominal head Ø 0.460″ · Head height 0.10″ · Pack: 500 Box weight: 17.5 lb / 500. 
• DFSEBL340 — 1/4″-20 × 4″ (Point #4) Max load-bearing length 3.188″ · Min protrusion 13/16″ · Nominal head Ø 0.460″ · Head height 0.10″ · Pack: 500 Approx. box weight: ~22.5 lb / 500 (per-piece ~0.045 lb × 500). 

Notes: • “Max load-bearing length” & “min protrusion” per DEWALT ordering table; undercut flat heads are 82°. • Weights marked “approx./estimate” are scaled from distributor-published pack weights; packaging may vary slightly by supplier.

Q: Why choose DEWALT Dril-Flex® Phillips Undercut Flat Head self-drilling screws?
A: These screws combine a hardened drill point and lead threads for fast, efficient drilling, with a lower-hardness section for improved ductility and resistance to embrittlement. The undercut flat head design allows flush seating and secure torque engagement. Sold in 100-pack quantities with multiple sizes available under this parent page.

Q: What does the Stalgard® coating do?
A: Stalgard® multi-layer coatings provide superior corrosion resistance and reduce galvanic interaction in dissimilar-metal assemblies. Stalgard® SUB extends this protection to 2,000 hours in salt spray tests (ASTM B117).

Q: Which size should I choose for my application?
A: Choose a length that allows 3–5 full threads to extend past the final material layer for strong engagement. The drill-point capacity should meet or exceed the combined material thickness. Shorter lengths are best for light-gauge steel; longer screws suit thicker or multi-layer assemblies.

Q: Are these code-compliant for structural metal-to-metal connections?
A: Yes. These screws carry ICC-ES approvals (ESR-3332, ESR-4367, ESR-4374) and meet major building codes, including IBC, IRC, Florida, and Los Angeles codes. Always verify part-specific approvals for your chosen size and finish.