3/8-16 x 3 Elco Tap-Flex / Hex Washer Head / Steel / Stalgard (250ct)

Tap-Flex Thread-Forming Structural Screws are thread-forming, dual heat treated self-tapping fasteners that provide the strength, ductlity, and resistance to embrittlement failures required in critical curtain wall and dissimilar metal applications. Tap-Flex fasteners are designed to offer a replacement option for traditional nut and bolt assemblies. These fasteners provide an excellent solution for blind connections. The patented E-Form segmented thread profile design improves installation and forms threads that provide increased thread engagement.

Features & Specs:

• Eliminates thread-tapping operations and allows for blind installations (e.g. HSS)
• E-Form thread profile overcomes friction build-up and reduces drive torque
• Serrations on underside of hex washer head lock against the fixture
• Stalgard Plus Coating provides improved corrosion resistance as well as enhanced galvanic compatibility in dissimilar metal applications, including those involving aluminum, compared with fasteners with standard zinc plating
• Fasteners accept standard nuts and washers (if desired and/or required)
• High hardness lead threads for tapping into steel and aluminum
• Formed threads help resist loosening (e.g., vibration, thermal change)
• In the load-bearing area, a lower hardness heat treatment provides Grade 5 bolt mechanical properties, resulting in a fastener with increased ductility having no significant susceptibility to Hydrogen-Assisted Stress Corrosion Cracking (HASCC)
• Fasteners coated with Stalgard PLUS typically show no red rust or other base metal corrosion on significant surfaces after 1500 hours of salt spray exposure in accordance with ASTM B117

General Application & Uses

• Hollow Steel Sections (HSS)
• Curtain Wall/Cladding
• Metal Infill Panels
• Window Walls/Glazing
• Angles and Brackets
• Stairs and Risers

Approvals & Listings

• Pull-out testing conducted in accordance with AISI S905 using the alternate tension test (with adjustments to allow for large fastener diameters)
• Shear testing conducted in accordance with AISI S905 using the standard lap joint shear test (with adjustments to allow for large fastener diameters)