S-91870A550 M8 x 20 mm ASTM F879M Tamper-Resistant Torx Stainless Steel Flat Head Screws

Key Features & Benefits at a Glance

• Enhanced tamper resistance with T45 Torx drive design, preventing unauthorized access in security-critical applications
• Superior corrosion protection through 18-8 stainless steel construction and passivated finish, ideal for harsh environments
• Reliable mechanical performance with 80,000 psi tensile strength and Rockwell B96 hardness for long-term structural integrity
• Precision thread engagement with Class 6g fit and M8x1.25mm coarse threading, ensuring consistent fastening in industrial assemblies
• Optimized flush mounting with standard flat head profile and 90° countersink angle for seamless surface integration
• Full-threaded design providing maximum grip length and load distribution across the entire 20mm shaft
• Regulatory compliance assurance meeting ASTM F879M, RoHS 3, and REACH standards for quality and environmental safety

Professional Applications & Engineering Value

Engineered for high-security industrial applications, these M8 flat head screws address critical challenges in public infrastructure, machinery guarding, and electronic enclosures where tampering prevention is paramount. The 18-8 stainless steel material combined with passivated finish creates a robust barrier against chemical exposure and atmospheric corrosion, significantly extending service life in manufacturing plants, marine equipment, and outdoor installations. The tamper-resistant Torx T45 drive system deters casual disassembly while maintaining precise torque transmission during installation. With fully threaded metric coarse threading and Class 6g thread fit, these security screws provide vibration-resistant fastening in sheet metal assemblies, control panels, and transportation equipment where reliability cannot be compromised.

Specification Summary & Compliance

Manufactured to metric system standards with precise M8x1.25mm coarse thread and Class 6g thread fit tolerance ensuring dimensional accuracy across production batches. The flat head profile features standard geometry with 90° countersink angle for proper seating in prepared holes. Compliance is verified with ASTM F879M specification for mechanical properties, alongside RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming absence of restricted substances for global industrial deployment.