S-91870A408 M4 x 12 mm ASTM F879M Tamper-Resistant Torx Stainless Steel Flat Head Screws

Key Features & Benefits at a Glance

• Enhanced tamper resistance with T20 Torx drive to prevent unauthorized access in secure environments
• Superior corrosion resistance from 18-8 stainless steel with passivated finish for extended service life in harsh conditions
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B96 hardness for reliable performance under stress
• Optimized thread engagement through Class 6g coarse threading ensures secure fastening and vibration resistance
• Full threading design provides maximum grip and holding power across the entire 12mm length
• Regulatory compliance with ASTM F879M, RoHS 3, and REACH standards for quality assurance and environmental safety
• Precision flat head profile with 90° countersink angle for flush installation in demanding applications

Professional Applications & Engineering Value

This M4 metric flat head screw delivers critical engineering solutions where security and durability are paramount. The 18-8 stainless steel construction with passivated finish provides exceptional corrosion resistance for outdoor equipment, marine components, and industrial machinery exposed to moisture and chemicals. The tamper-resistant Torx T20 drive prevents unauthorized disassembly in public infrastructure, security systems, and electronic enclosures while maintaining installation efficiency. The fully threaded Class 6g coarse thread design ensures maximum thread engagement and vibration resistance in high-stress applications. These metric security fasteners are engineered to maintain integrity in demanding environments where standard fasteners would fail, offering reliable performance in automotive assemblies, industrial controls, and telecommunications equipment.

Specification Summary & Compliance

This M4 x 0.7mm coarse thread screw maintains precision Class 6g thread fit tolerances according to metric standards. Manufacturing specifications comply with ASTM F879M for consistent quality and performance. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements, ensuring environmental safety and regulatory adherence for industrial applications worldwide.