S-90517A370 M8 x 20 mm ASTM F879M Tamper-Resistant Hex Drive Flat Head Screws
Tamper-Resistant Hex Drive Flat Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Enhanced tamper resistance with specialized hex drive design to prevent unauthorized access in secure applications
- Superior corrosion resistance through 18-8 stainless steel construction and passivated finish for extended service life in harsh environments
- High mechanical strength with 80,000 psi tensile strength and Rockwell B96 hardness for reliable performance under heavy loads
- Precise thread engagement with Class 6g metric coarse threading ensuring consistent fastening and vibration resistance
- Optimal countersinking with standard 90° flat head profile for flush installation and clean aesthetic finish
- Full regulatory compliance meeting ASTM F879M, RoHS 3, and REACH standards for global industrial applications
- Complete thread coverage along the 20mm length for maximum grip and load distribution
Professional Applications & Engineering Value
This M8 flat head screw with tamper-resistant hex drive addresses critical security and durability challenges in industrial settings. The 18-8 stainless steel material combined with passivated finish provides exceptional resistance to corrosion, making it ideal for outdoor equipment, marine applications, and chemical processing facilities where environmental exposure is a concern. The Class 6g thread fit and 1.25mm coarse pitch ensure rapid installation and reliable performance in high-vibration machinery, while the tamper-resistant feature prevents unauthorized disassembly in public infrastructure, transportation systems, and secure enclosures. With 80,000 psi tensile strength, this fastener maintains structural integrity in demanding applications from manufacturing equipment to security installations.
Specification Summary & Compliance
This metric flat head screw features M8 x 1.25mm coarse threading with Class 6g tolerance for precise fitment. The 20mm length is fully threaded for maximum holding power. Manufacturing complies with ASTM F879M specification for consistency and performance. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring safe use in various industrial sectors without hazardous substance restrictions.
