Bi-Flex™ 300 Series Stainless Steel Bi-Metal Self-Drilling Fasteners Technical Specification Data
The Corrosion Resistance of 18-8 Stainless Steel & the Efficiency of Drill Screws
Owners, architects and, design engineers expect longer life cycles from buildings. Extended warranties and use of more sustainable materials add up to greater expectations for performance – from structural integrity to the purely aesthetic – of all building components.
The Solution: Bi-Flex™ 300 Series (18-8) Stainless Steel Self-Drilling Fasteners
Bi-Flex fasteners bring the corrosion resistance of 300 series stainless steel and the efficiency of self-drilling fasteners together in one unique fastener.
- Unmatched, multi-level corrosion resistance
- Quick and easy installation into structural steel and aluminum up to 1/2" thick
- Perfect choice for exposed/wet areas/aggressive environments
- High performance for your most critical applications
To provide the maximum, long-term corrosion resistance, Elco 300 series stainless steel for their Bi-Flex fasteners.
To allow for the most efficient installations, each Bi-Flex fastener has a fused and hardened, self-drilling and tapping point.
To combat the widest variety of corrosion scenarios involving dissimilar metals such as aluminum, each 300 series stainless steel Bi-Flex fastener has Stalgard® GB (Galvanic Barrier) coating.
To eliminate the threat of delayed “embrittlement” fastener failures, such as Hydrogen Assisted Stress Corrosion Cracking (HASCC), seen in hardened 400 series self-drilling stainless steel fasteners, Bi-Flex fasteners are made of 300 series stainless alloys that are virtually immune to this type of catastrophic failure.
For the most demanding applications that other fasteners can’t handle, Bi-Flex 300 series stainless steel self-drilling fasteners are the right choice.
Understand Bi-Flex® Features, Applications, types of corrosion and about embrittlement failures
Shop Bi-Flex Bi-Metal Self-Drilling Fasteners
Elco Technical & Product Data Pages

Features
- Bi-metal technology – 300 (18-8) stainless steel head and shank
- Fused and hardened steel drill point
- Silver-colored Stalgard® GB coating
- Wide variety of sizes and head styles
Approvals
- City of Los Angeles (COLA) Research Report: RR25886 (CSI #05 05 23)
Benefits
- Outstanding corrosion resistance and long service life
- High strength, ductility and reliability
- Virtually immune to delayed embrittlement failures
- Greater galvanic compatibility in dissimilar metal applications involving aluminum
- Quickly drill and tap into steel or aluminum up to 1/2" thick
- High in-place value over the life of structures, components and systems
Applications
- Exposed/wet areas/coastal/aggressive environments
- Curtain wall/window wall systems/rain-screen systems
- Windows/doors/aluminum enclosures/skylights
- Composite panel systems to aluminum or steel
- ACQ-treated wood to steel
- Brick veneer anchoring
- Solar panel systems
Whether your application is lightweight, structural or purely aesthetic, you won’t find a better or easier-to-install 300 series stainless steel fastener with multi‑level corrosion protection for your toughest construction applications.



