S-91870A210 8-32 x 5/8" ASME B18.3 Tamper-Resistant Torx Stainless Steel Flat Head Screws

Key Features & Benefits at a Glance

• Enhanced tamper resistance with Torx T20 drive to prevent unauthorized access in secure installations
• Superior corrosion protection through 18-8 stainless steel construction and passivated finish for long-term reliability in harsh environments
• High mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness to withstand heavy loads and vibration
• Secure fastening engagement with fully threaded UNC coarse threads and Class 2A fit for consistent clamping force
• Flush mounting capability with standard 82° flat head profile for smooth surface finishes in visible applications
• Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations for global project specifications
• Optimized drive transfer with precise T20 drive size ensuring maximum torque application without stripping

Professional Applications & Engineering Value

This 8-32 UNC flat head tamper-resistant Torx screw delivers critical security and durability for demanding industrial applications. The combination of 18-8 stainless steel material and passivated finish provides exceptional resistance to corrosion, chemicals, and environmental factors, making it ideal for outdoor equipment, marine hardware, and food processing machinery. The tamper-resistant Torx T20 drive prevents unauthorized access in public fixtures, electrical enclosures, and security systems, while the fully threaded coarse UNC pattern ensures rapid installation and reliable holding power in metal, plastic, and composite materials. Engineers specify this fastener for applications requiring both vandal resistance and long-term performance in corrosive environments.

Specification Summary & Compliance

This security screw features precision UNC coarse threads with Class 2A thread fit for consistent engagement and reliable performance. Manufacturing complies with ASME B18.3 specifications for dimensional accuracy and quality assurance. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting international environmental standards for hazardous substance restrictions. Critical dimensions include 8-32 thread size, 5/8" length, 0.359" head diameter, and standard 82° countersink angle for proper flush mounting in prepared surfaces.