S-90517A190 M4 x 6 mm ASTM F879M Tamper-Resistant Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior tamper resistance with specialized hex drive requiring matching tools, preventing unauthorized access in high-security installations.
• Exceptional corrosion resistance from 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments.
• High mechanical strength with 80,000 psi tensile strength and Rockwell B96 hardness for demanding industrial applications.
• Precision thread engagement with Class 6g fit and coarse pitch, enabling quick installation and reliable fastening performance.
• Full threading design provides maximum grip length and uniform stress distribution across the entire fastener.
• Standard flat head profile with 90° countersink allows for flush mounting in precision assemblies.
• Comprehensive compliance with ASTM F879M specifications and environmental regulations including RoHS 3 and REACH.

Professional Applications & Engineering Value

These M4 metric flat head screws with tamper-resistant hex drive address critical security and durability challenges in industrial applications. The 18-8 stainless steel construction combined with passivated finish provides exceptional resistance to corrosion, making them ideal for outdoor equipment, marine environments, and chemical processing facilities where moisture and corrosive agents are present. The fully threaded design with Class 6g thread fit ensures maximum thread engagement and vibration resistance in assemblies requiring permanent security. These security screws are particularly valuable for public infrastructure, electrical enclosures, and transportation equipment where tamper-proof fastening is essential to prevent vandalism or unauthorized access while maintaining structural integrity under mechanical stress.

Specification Summary & Compliance

This M4 x 0.7mm flat head screw features precision metric coarse threading with Class 6g thread fit tolerance, ensuring consistent performance in industrial applications. Manufactured to meet ASTM F879M specifications for mechanical properties and dimensional accuracy. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, containing no restricted substances. The 5/32" tamper-resistant hex drive and standard 90° countersink angle provide secure installation while maintaining the flush profile characteristic of flat head fasteners.