S-91900A867 M8 x 20 mm ASTM F879M, ISO 7380 Tamper-Resistant Torx Stainless Steel Button Head Screws

Key Features & Benefits at a Glance

• Enhanced tamper resistance with T40 Torx drive prevents unauthorized access in high-security applications
• Superior corrosion resistance through 18-8 stainless steel construction and passivated surface treatment
• Reliable mechanical performance with 80,000 psi tensile strength and Rockwell B96 hardness rating
• Precise thread engagement with Class 6g metric threading ensures consistent fastening performance
• Full-length threading provides maximum grip and holding power across the entire fastener length
• Regulatory compliance meets RoHS 3 and REACH environmental standards for global industrial use
• Rounded button head design offers low-profile installation with reduced snagging risks

Professional Applications & Engineering Value

This M8 tamper-resistant Torx screw delivers critical security and durability for demanding industrial environments. The 18-8 stainless steel composition, enhanced by passivated finish, provides exceptional resistance to corrosion and chemical exposure, making it ideal for outdoor equipment, marine applications, and chemical processing facilities. The T40 Torx drive system requires specialized tools, preventing unauthorized tampering in public infrastructure, transportation systems, and secure enclosures. With fully threaded M8x1.25mm coarse threading and Class 6g tolerance, these rounded head screws ensure reliable fastening in vibration-prone assemblies while maintaining consistent clamp load. The combination of 80,000 psi tensile strength and standardized dimensions per ASTM F879M/ISO 7380 guarantees interchangeability and performance predictability across industrial maintenance and OEM manufacturing applications.

Specification Summary & Compliance

This security fastener features M8x1.25mm coarse metric threading with Class 6g precision tolerance, ensuring compatibility with standard metric components. Manufacturing complies with ASTM F879M and ISO 7380 specifications for dimensional accuracy and mechanical properties. The screw maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming absence of restricted substances. With complete threading along the 20mm length and standardized rounded button head profile, this fastener delivers consistent performance across industrial security applications.