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#10-16 X 2" Dril-Flex® Structural Self-Drilling Screws, 5/16 Hex Washer Head, #3 Point, Alloy Steel with Stalgard SUB Coating

Item Code: ELC EAF470

Manufacturer: Elco Construction Products

Price:

Availability: available for order, typically ships within 3-5 business days.

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Unit Size: 2,000
Pkg Qty: 2000
Item Weight: 20.00 lbs
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#10-16 X 2" Dril-Flex® Structural Self-Drilling Screws, 5/16 Hex Washer Head, #3 Point, Alloy Steel with Stalgard SUB Coating

Dual heat treated drill screws provide the strength, ductility and resistance to embrittlement required for critical applications.

Dril-Flex® Structural Self-Drilling Screws

The dual heat treated drill screws provide the strength, ductility and resistance to embrittlement required for critical applications. Making these self-drilling structural screws virtually immune to delayed embrittlement failures.

  • Stalgard SUB coating (Hex washer product only) provides 2000 hours of salt spray resistance (per ASTM B117)
  • High-hardness points and lead threads for drilling and tapping with lower-hardness in load-bearing threads for ductility
  • Virtually immune to delayed embrittlement failures
Approvals
  • ICC-ES Report No. ESR-3332
  • COLA (City of Los Angeles) Research Report #25095
Comparison to Stainless Steel Screws

300 series stainless steel fasteners provide high resistance to hydrogen embrittlement failures. However, stainless steel is galvanically incompatible with aluminum or steel panels. In this case, stainless steel fasteners trigger a sacrificial action, which can lead to degradation of the panel and loosening of the fastener. A dual-hardening process allows Dril-Flex® fasteners to provide high strength and resistance to hydrogen embrittlement failures. Their Stalgard® finish provides corrosion resistance several times greater than other commonly-used finishes. If an environment is corrosive enough to significantly affect the Stalgard finish, the potential for significant degradation of the aluminum/ stainless steel assembly would also exist.



  • Diameters: #10 to 3/8"
  • Lengths: 3/4" to 4"
  • Head/Drive Styles: Hex washer and phillips pan, wafer and undercut flat
  • Point Types: #3, #4 and #5
  • Material: Alloy steel
  • Heat Treat: Grade 5
  • Finishes: Silver Stalgard® or Stalgard SUB coating
Embrittlement Tests

Embrittlement testing of Dril-Flex screws was performed in accordance to ASTM F1624-06. Fastener lots were tested to determine their Threshold Stress Limits for both Internal Hydrogen Embrittlement and Environmental Hydrogen Embrittlement. Threshold Stress Limit is the stress level below which no time-dependent cracking will occur. Above this level, subcritical cracking that leads to time‑delayed fracture or embrittlement may occur if the fastener is exposed to a hydrogen environment.

Embrittlement Test Results
  • Dril-Flex fasteners have a hardness range of HRC 28 – 34, which is roughly equivalent to a SAE Grade 5 fastener (HRC 25 – 34)
  • Dril-Flex fasteners showed resistance to the effect of hydrogen-assisted cracking when loaded to 75% of their tensile strength. This is within accepted industry guide lines for in-service loading conditions
  • Dril-Flex fasteners showed no degradation or failures in tensile strength below their ultimate tensile strength
  • Additional Info
  • Features
  • Document & Guides
  • Technical Specs

Additional Info

Dril-Flex® Structural Self-Drilling Screws

The dual heat treated drill screws provide the strength, ductility and resistance to embrittlement required for critical applications. Making these self-drilling structural screws virtually immune to delayed embrittlement failures.

  • Stalgard SUB coating (Hex washer product only) provides 2000 hours of salt spray resistance (per ASTM B117)
  • High-hardness points and lead threads for drilling and tapping with lower-hardness in load-bearing threads for ductility
  • Virtually immune to delayed embrittlement failures
Approvals
  • ICC-ES Report No. ESR-3332
  • COLA (City of Los Angeles) Research Report #25095
Comparison to Stainless Steel Screws

300 series stainless steel fasteners provide high resistance to hydrogen embrittlement failures. However, stainless steel is galvanically incompatible with aluminum or steel panels. In this case, stainless steel fasteners trigger a sacrificial action, which can lead to degradation of the panel and loosening of the fastener. A dual-hardening process allows Dril-Flex® fasteners to provide high strength and resistance to hydrogen embrittlement failures. Their Stalgard® finish provides corrosion resistance several times greater than other commonly-used finishes. If an environment is corrosive enough to significantly affect the Stalgard finish, the potential for significant degradation of the aluminum/ stainless steel assembly would also exist.



  • Diameters: #10 to 3/8"
  • Lengths: 3/4" to 4"
  • Head/Drive Styles: Hex washer and phillips pan, wafer and undercut flat
  • Point Types: #3, #4 and #5
  • Material: Alloy steel
  • Heat Treat: Grade 5
  • Finishes: Silver Stalgard® or Stalgard SUB coating
Embrittlement Tests

Embrittlement testing of Dril-Flex screws was performed in accordance to ASTM F1624-06. Fastener lots were tested to determine their Threshold Stress Limits for both Internal Hydrogen Embrittlement and Environmental Hydrogen Embrittlement. Threshold Stress Limit is the stress level below which no time-dependent cracking will occur. Above this level, subcritical cracking that leads to time‑delayed fracture or embrittlement may occur if the fastener is exposed to a hydrogen environment.

Embrittlement Test Results
  • Dril-Flex fasteners have a hardness range of HRC 28 – 34, which is roughly equivalent to a SAE Grade 5 fastener (HRC 25 – 34)
  • Dril-Flex fasteners showed resistance to the effect of hydrogen-assisted cracking when loaded to 75% of their tensile strength. This is within accepted industry guide lines for in-service loading conditions
  • Dril-Flex fasteners showed no degradation or failures in tensile strength below their ultimate tensile strength

Features

  • Stalgard SUB coating (Hex washer product only) provides 2000 hours of salt spray resistance (per ASTM B117)
  • High-hardness points and lead threads for drilling and tapping with lower-hardness in load-bearing threads for ductility
  • Virtually immune to delayed embrittlement failures
  • Made in the USA
  • ICC-ES Report No. ESR-3332
  • COLA (City of Los Angeles) Research Report #25095

Technical Specs

Product TypeSelf-Drilling Structural Screw
MaterialAlloy Steel
Diameter#10
Length2"
Drive TypeHex
Head TypeHex Washer
Head Size5/16"
Point Size#3
FinishStalgard SUB Coating
SourceMade in USA
Load Bearing Area1.50"
ApprovalsICC-ES ESR-3332, COLA Research Report #25095
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