S-91870A412 M4 x 16 mm ASTM F879M Tamper-Resistant Torx Stainless Steel Flat Head Screws
Tamper-Resistant Torx Stainless Steel 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 T20 Torx drive prevents unauthorized access in secure installations
- Superior corrosion protection through 18-8 stainless steel construction and passivated surface treatment
- Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B96 hardness for demanding applications
- Optimized thread engagement with Class 6g coarse threads and full threading provides maximum holding power
- Precision flush mounting with standard flat head profile and 90° countersink angle for seamless surface integration
- Reliable metric compatibility with M4 x 0.7mm coarse thread specifications for consistent performance
- Comprehensive regulatory compliance meeting ASTM F879M, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
These M4 flat head screws with tamper-resistant Torx drive address critical security and durability challenges in industrial environments. The 18-8 stainless steel material combined with passivated finish creates a robust barrier against corrosion, chemicals, and environmental degradation, significantly extending service life in harsh conditions. The fully threaded design with Class 6g thread fit ensures maximum thread engagement and vibration resistance, preventing loosening in high-stress applications. These metric security screws are engineered for access panels, electronic enclosures, public infrastructure, and machinery where unauthorized tampering must be prevented while maintaining high tensile strength and long-term reliability.
Specification Summary & Compliance
This flat head screw features precise M4 x 0.7mm coarse threading with Class 6g thread tolerance for consistent fit and performance. The 16mm length with standard flat head profile and 90° countersink angle ensures proper flush mounting. Manufacturing complies with ASTM F879M specifications for dimensional accuracy and mechanical properties. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring safe use in restricted substance-sensitive applications worldwide.
