S-90517A290 M5 x 20 mm ASTM F879M Tamper-Resistant Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Tamper-resistant hex drive prevents unauthorized removal, enhancing security in public or sensitive installations.
• 18-8 stainless steel construction offers excellent corrosion resistance and durability in harsh environments.
• Passivated finish further boosts corrosion protection, extending service life and reducing maintenance needs.
• High tensile strength of 80,000 psi ensures reliable performance under heavy loads and vibration.
• Class 6g thread fit with coarse pitch provides secure, easy installation and resistance to loosening.
• 90° countersink angle and flat head design allows for a flush, clean finish in assembled components.
• Full threading ensures maximum grip and holding power along the entire screw length.

Professional Applications & Engineering Value

This M5 flat head screw is engineered for industrial and security applications where durability and tamper resistance are critical. The 18-8 stainless steel material, combined with a passivated finish, provides superior resistance to rust and chemical exposure, making it ideal for outdoor equipment, machinery, and electronic enclosures. The tamper-resistant hex drive deters vandalism and unauthorized access, while the Class 6g thread fit and coarse thread spacing ensure quick, reliable installation in metal, plastic, or composite materials. Its fully threaded design and 90° countersink enable a secure, low-profile fit, reducing the risk of snagging and improving aesthetic integration in assemblies.

Specification Summary & Compliance

This screw features a metric M5 x 0.8mm thread with Class 6g tolerance for precise fit, and is fully threaded with a right-hand orientation. It complies with ASTM F879M specifications for consistent quality and performance. Additionally, it is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring environmental safety and regulatory adherence for global supply chains.