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

DEWALT Dril‑Flex® Self‑Drilling Structural Screws are dual heat‑treated tapping fasteners engineered for reliable steel‑to‑steel connections in demanding building‑envelope and light‑structural applications. A high‑hardness #2–#5 drill point with lead threads speeds drilling and tapping, while a lower‑hardness load‑bearing section improves ductility and reduces susceptibility to hydrogen‑assisted stress corrosion cracking versus case‑hardened alternatives. Stalgard® and Stalgard® SUB coatings deliver significantly improved corrosion resistance and galvanic compatibility—especially in mixed‑metal assemblies with aluminum—compared to standard zinc plating. (Typical performance: no red rust on significant surfaces after 1,000 hours with Stalgard® and 2,000 hours with Stalgard® SUB per ASTM B117.) Dril‑Flex® HWH screws are code‑listed for use under the IBC/IRC and tested to ICC‑ES AC118 (steel‑to‑steel) and AC500 (miscellaneous materials to steel). Offered in multiple diameters and lengths under this parent item, each size is sold in 100‑pack quantities for efficient jobsite stocking and submittals.

Key Features

• Dual heat‑treated design: hard drill point for fast penetration; tougher shank for ductility under load
• Hex washer head (HWH) drive for positive engagement and high clamp load
• Stalgard® / Stalgard® SUB coatings for superior corrosion resistance and better galvanic compatibility in aluminum and mixed‑metal assemblies
• Typical salt‑spray performance: 1,000 hrs (Stalgard®) and 2,000 hrs (Stalgard® SUB) with no red rust on significant surfaces per ASTM B117
• ICC‑ES listed (ESR‑3332, ESR‑4367, ESR‑4374); compliant with 2012/2015/2018/2021 IBC & IRC; tested to AC118 and AC500
• Multiple sizes (#10–5/16" diameters, various thread pitches and lengths) available under this parent item; each ships in 100‑pack quantities

Applications

• Steel-to-steel structural connections
• Aluminum-to-steel fastening with galvanic protection
• Attaching curtain walls, rainscreens, window walls, and glazing systems
• Solar panel mounting and other exterior metal construction
• Fastening dissimilar metals where high corrosion resistance is required
• General structural and light-gauge steel fabrication

Available Head Styles

• Hex Washer Head (this page)
• Hex Washer Head with Serrations

Drill Point Types

• Self-drilling points matched to material thickness (selection varies by size)
• Common point options within the Dril-Flex® line include #2, #3, #4, and #5
• Refer to the DEWALT technical data/size chart for exact drill-point per diameter/length

Screw Sizes & Thread Options

• Multiple diameters and lengths available (#10, #12, 1/4", and 5/16")
• Self-drilling tapping threads for metal-to-metal fastening
• Alloy-steel construction with dual heat-treated design for strength and ductility
• Stalgard® and Stalgard® SUB coating options for superior corrosion resistance
• Sold in 100-pack quantities

• Construction & performance
  • Dual heat-treated self-drilling/tapping structural screws for strength, ductility, and resistance to embrittlement. 
  • High-hardness point/lead threads for drilling; lower-hardness load-bearing section to reduce HASCC risk vs. case-hardened fasteners. 
  • Coatings: Stalgard® or Stalgard® SUB for enhanced corrosion resistance + galvanic compatibility (incl. aluminum); SUB typically outperforms standard zinc in salt-spray tests. 
• Typical applications: Curtain walls, rainscreen, window walls/glazing, solar panel systems.
• Approvals & listings: ICC-ES ESR-3332, ESR-4367, ESR-4374; code compliant with 2012/2015/2018/2021 IBC/IRC; tested to AC118 & AC500 (steel-to-steel & misc. materials). 

Representative sizes — dimensions & box weights

• DFSEAF430 — #10-16 × 3/4"
  Head: Hex Washer | Drive: 5/16" | Shank: #10 | TPI: 16 | Point: #3 | Material: Alloy Steel | Finish: Stalgard® SUB | Full Case qty 6,000
  Box weight: ~48 lb (6,000/BX). 
• DFSEAF486 — #10-16 × 1"
  Head: Hex Washer | Drive: 5/16" | Shank: #10 | TPI: 16 | Point: #3 | Material: Alloy Steel | Finish: Stalgard® | Full Case qty 5,000
  Box weight: ~45 lb (5,000/Bulk). 
• DFSEAF480 — #10-16 × 2-1/2"
  Head: Hex Washer w/ Serrations | Drive: 5/16" | Shank: #10 | TPI: 16 | Point: #3 | Material: Alloy Steel | Finish: Stalgard® SUB | Full Case qty 1,500
  Box weight: ~25.05 lb (1,500/BX). 
• DFSEAF621 — #12-14 × 7/8"
  Head: Hex Washer | Drive: 5/16" | Shank: #12 | TPI: 14 | Point: #3 | Material: Alloy Steel | Finish: Stalgard® SUB | Full Case qty 5,000
  Box weight: ~55 lb (5,000/Bulk). 
• DFSEAF690 — #12-14 × 2"
  Head: Hex Washer | Drive: 5/16" | Shank: #12 | TPI: 14 | Point: #3 | Material: Alloy Steel | Finish: Stalgard® SUB | Full Case qty 2,000
  Box weight: ~40 lb (2,000/BX). 
• DFSEAF816 — 1/4"-14 × 1"
  Head: Hex Washer | Drive: 3/8" | Shank: 1/4" | TPI: 14 | Point: #3 | Material: Alloy Steel | Finish: Stalgard® SUB | Full Case qty 3,000
  Box weight: ~51 lb (3,000/Bulk). 
• DFSEAF886 — 1/4"-20 × 2"
  Head: Hex Washer | Drive: 3/8" | Shank: 1/4" | TPI: 20 | Point: #4 | Material: Alloy Steel | Finish: Stalgard® SUB | Full Case qty 1,500
  Box weight: ~45 lb (1,500/BX). 
• DFSEAF940 — 5/16"-18 × 1-1/2"
  Head: Hex Washer | Drive: 3/8" | Shank: 5/16" | TPI: 18 | Point: #3 | Material: Alloy Steel | Finish: Stalgard® SUB | Full Case qty 1,000
  Box weight: ~37 lb (1,000/Bulk).

Q: What are DEWALT Dril-Flex® Self-Drilling Structural Screws used for
A: They’re engineered for fast, reliable steel-to-steel connections in curtain walls, rainscreens, window walls/glazing, solar mounts, and other metal construction. The self-drilling point taps its own hole, reducing install time and preserving clamp load.

Q: What’s the difference between Stalgard® and Stalgard® SUB coatings?
A: Both coatings improve corrosion resistance and galvanic compatibility versus zinc plating—especially in dissimilar-metal assemblies with aluminum. Typical salt-spray performance shows no red rust on significant surfaces to ~1,000 hours (Stalgard®) and ~2,000 hours (Stalgard® SUB) per ASTM B117.

Q: Are Dril-Flex® screws code listed?
A: Yes. Dril-Flex® carries ICC-ES listings (ESR-3332, ESR-4367, ESR-4374) and complies with the 2012/2015/2018/2021 IBC & IRC. They’re tested to AC118 (steel-to-steel) and AC500 (miscellaneous materials to steel).

Q: How do I choose the right size and drill point?
A: Select diameter/length to match total material thickness and required engagement. Common drill points in this line include #2–#5; heavier gauges may require higher numbers. Refer to the DEWALT size chart for exact drill-point by diameter/length. All sizes on this parent page are sold in 100-pack quantities.