Dril-Flex® Structural Self-Drilling Screws

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Dril-Flex®

Structural Self-Drilling Fasteners

Offering outstanding resistance to hydrogen-assisted embrittlement and corrosion for maximum performance in the field

More Information

Dril-Flex® fasteners are specially designed and processed to help prevent hydrogen-induced brittle failures. Each fastener undergoes a unique dual-hardening process to ensure the optimal combination of ductility and hardness required for maximum performance in the field.

Testing of this product, in accordance with ASTM standards, has proven that Dril-Flex fasteners provide the same resistance to hydrogen-assisted cracking (HAC) as a Grade 5 fastener.

Unique Hardening and Finishing resistance Processes Provide Unmatched Performance

Hydrogen-Assisted Cracking (HAC) refers to any time-delayed failure mechanism that is aggravated or accelerated because of the presence of hydrogen. Most self-drilling fasteners are case-hardened, which provides the necessary hardness for drilling and tapping, but leaves the screws vulnerable to HAC due to their high surface hardness.

Dril-Flex fasteners offer a unique dual-hardening process. The self-drilling point and lead tapping threads are selectively hardened to a minimum of HRC 52. The load-bearing portion of the screw is held at or below the critical HRC 34 level. This reduced hardness level also meets SAE J429 Grade 5 and ASTM A449 strength and ductility standards.

Dril-Flex fasteners are then coated with Stalgard® finish to provide superior corrosion resistance. Fasteners coated with Stalgard finish typically show no red rust or other base metal corrosion on significant surfaces even after 800 hours of 5% neutral salt spray exposure (ASTM B117).

The combination of this unique dual-hardening process and Stalgard finish results in a strong, reliable fastener that can be used where other self-drillers would fail. Dril-Flex self-drilling fasteners are the ideal fastening solution for demanding construction applications.

Features

Self-drilling point
Higher hardness (HRC 52 min.) point and lead threads
Lower-hardness (HRC 28 – 34) load-bearing threads
Silver-colored Stalgard® finish
Complies with Buy America Act

Benefits

Provides the same high resistance to hydrogen-assisted failure as a Grade 5 fastener
Ensures consistent, reliable drilling and tapping
Eliminates separate drilling and tapping operations
Corrosion resistance superior to zinc- or cadmium-based finishes
Can be used in applications with dissimilar materials
Approvals: ICBO Evaluation Report No. 47-80; COLA (City of Los Angeles) Research Report #25095

Cad Drawings

af430.dwg	af621.dwg	af641.dwg	af681.dwg	af690.dwg
af816.dwg	af841.dwg	af846.dwg	af865.dwg	af876.dwg
af886.dwg	af890.dwg	af960.dwg	bl215.dwg

US and Canada: 815-391-5500 | Toll Free: 800-435-7213
General Information: infoElco@acument.com | Sales: salesElco@acument.com