S-91870A467 M5 x 20 mm ASTM F879M Tamper-Resistant Torx Stainless Steel Flat Head Screws

Key Features & Benefits at a Glance

• Enhanced Security: Tamper-resistant T25 Torx drive prevents unauthorized removal, ideal for public or high-security installations.
• Superior Corrosion Resistance: 18-8 stainless steel with passivated finish ensures long-term durability in harsh or humid environments.
• High Mechanical Strength: 80,000 psi tensile strength and Rockwell B96 hardness provide reliable performance under heavy loads and vibration.
• Optimized Thread Engagement: Fully threaded M5 coarse thread with Class 6g fit ensures quick installation and superior holding power.
• Streamlined Installation: Flat head with 90° countersink angle sits flush for a smooth, professional finish in pre-countersunk applications.
• Broad Compliance: Meets ASTM F879M specifications and is RoHS 3 & REACH compliant for safe use in regulated industries.
• Dependable Fastening: Right-hand metric threading and standardized dimensions ensure compatibility and repeatable performance.

Professional Applications & Engineering Value

This M5 flat head screw is engineered to address critical challenges in industrial and security-focused applications. The 18-8 stainless steel construction, enhanced by a passivated finish, provides exceptional resistance to oxidation and chemical exposure, making it suitable for outdoor equipment, marine hardware, and food processing machinery. The tamper-resistant Torx (T25) drive is a key security feature, deterring vandalism and unauthorized access in public infrastructure, electrical enclosures, and transportation systems. Its fully threaded design and coarse thread pitch maximize grip in various materials, from metal to certain plastics, reducing the risk of loosening under dynamic stresses. By integrating high tensile strength with precise metric threading, this screw delivers reliable, long-term fastening solutions where safety and durability are non-negotiable.

Specification Summary & Compliance

This screw features precise M5 x 0.8 mm coarse threads with a Class 6g tolerance for consistent fit. It is fully manufactured in compliance with ASTM F879M specifications, ensuring mechanical integrity and performance. The product is also verified as RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming it is free of hazardous substances and safe for use in regulated markets.