S-91870A430 M3.5 x 8 mm ASTM F879M Tamper-Resistant Torx Stainless Steel Flat Head Screws

Key Features & Benefits at a Glance

• Enhanced security with tamper-resistant Torx T15 drive to prevent unauthorized access in sensitive applications
• Superior corrosion resistance from 18-8 stainless steel construction with passivated finish for extended service life in harsh environments
• Reliable fastening performance with 80,000 psi tensile strength and Rockwell B96 hardness for high-stress applications
• Precision thread engagement with Class 6g thread fit and coarse thread spacing for quick installation and vibration resistance
• Complete regulatory compliance meeting ASTM F879M, RoHS 3, and REACH standards for global industrial use
• Optimized flush mounting with standard 90° countersink angle and flat head design for smooth surface finishing
• Full-thread coverage along the 8mm length ensures maximum holding power and load distribution

Professional Applications & Engineering Value

This M3.5 flat head screw delivers critical engineering solutions where security and durability are paramount. The 18-8 stainless steel construction with passivated finish provides exceptional resistance to corrosion and chemical exposure, making it ideal for industrial applications in manufacturing, electronics, and outdoor equipment. The tamper-resistant Torx T15 drive system prevents unauthorized access to sensitive assemblies while ensuring sufficient torque transmission without stripping. With Class 6g thread fit and coarse thread spacing, installation is streamlined while maintaining vibration resistance in dynamic environments. The fully threaded design and flat head profile create secure, flush-mounted connections that withstand mechanical stress while meeting strict industry standards for reliability and safety.

Specification Summary & Compliance

This metric fastener features precise M3.5 x 0.6 mm thread dimensions with Class 6g tolerance for consistent fit and performance. Manufactured to ASTM F879M specifications with fully threaded design and 90° countersink angle. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets. The right-hand thread direction and coarse thread spacing provide reliable fastening in various industrial applications while maintaining dimensional accuracy throughout the 8mm length.