S-91870A111 M3.5 x 25 mm ASTM F879M Tamper-Resistant Torx Stainless Steel Flat Head Screws

Key Features & Benefits at a Glance

• Enhanced tamper resistance with T15 Torx drive design to prevent unauthorized access and ensure equipment security in public or high-risk environments.
• Superior corrosion resistance from 18-8 stainless steel and passivated finish, ideal for harsh industrial settings and outdoor applications.
• High tensile strength of 80,000 psi provides reliable fastening under stress, reducing the risk of failure in demanding assemblies.
• Precise Class 6g thread fit ensures smooth installation and consistent engagement, minimizing cross-threading and assembly errors.
• Full threading along the 25 mm length offers maximum grip and adjustability in various material thicknesses.
• Rockwell B96 hardness maintains structural integrity and resists wear over repeated use, extending service life.
• Compliance with ASTM F879M, RoHS 3, and REACH guarantees safety, environmental responsibility, and interoperability in regulated industries.

Professional Applications & Engineering Value

This M3.5 flat head screw with a tamper-resistant Torx drive is engineered to address critical security and durability challenges in industrial applications. The 18-8 stainless steel construction, combined with a passivated finish, provides excellent resistance to corrosion and chemicals, making it suitable for electronics, machinery, and outdoor enclosures exposed to moisture. The flat head design with a 90° countersink angle ensures a flush fit, reducing snagging and improving aesthetics. Its coarse thread pitch and Class 6g thread fit enable quick, reliable installation in metals and plastics, minimizing assembly time while preventing tampering. Ideal for security screws in public infrastructure, transportation, and sensitive equipment, this fastener delivers long-term performance and compliance with global standards.

Specification Summary & Compliance

This product features a metric thread size M3.5 x 0.6 mm with Class 6g tolerance for precise fit, right-hand thread direction, and fully threaded 25 mm length. It meets ASTM F879M specifications for mechanical properties and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions adherence.