S-91870A530 M8 x 16 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 surface treatment for extended service life
• High mechanical strength with 80,000 psi tensile strength and Rockwell B96 hardness, ensuring reliable performance under load
• Precise thread engagement with Class 6g metric coarse threading (M8 x 1.25mm) for secure fastening in various materials
• Streamlined installation featuring fully threaded design and standard flat head profile for flush mounting in countersunk applications
• Regulatory compliance assurance meeting ASTM F879M specifications and environmental standards including RoHS 3 and REACH
• Optimized drive transfer through tamper-resistant Torx system, reducing tool slippage and damage during installation

Professional Applications & Engineering Value

Engineered for high-security industrial applications, this M8 flat head screw addresses critical challenges in access control and vandal-resistant installations. The 18-8 stainless steel composition combined with passivated finish provides exceptional resistance to corrosion, oxidation, and chemical exposure, making it ideal for harsh environments including outdoor equipment, marine applications, and chemical processing facilities. The tamper-resistant T45 Torx drive system ensures that fastened components remain secure against unauthorized removal, while the metric coarse threading (M8 x 1.25mm) delivers reliable holding power in metals, plastics, and composite materials. The fully threaded design and 90° countersink angle enable flush mounting for aesthetic requirements and safety considerations in public infrastructure, transportation systems, and electronic enclosures where tamper-proof security and environmental durability are paramount.

Specification Summary & Compliance

This security fastener maintains Class 6g thread fit tolerance according to metric standards, ensuring precise engagement and consistent performance. Manufacturing and material specifications comply with ASTM F879M requirements for stainless steel machine screws. The product meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) compliance regarding substance restrictions. The combination of 80,000 psi tensile strength and Rockwell B96 hardness provides mechanical reliability for demanding applications while the passivated finish on 18-8 stainless steel ensures long-term corrosion resistance in various operating conditions.