S-90484A569 3/8"-16 x 3/4" ASME B18.3, ASTM F835 Tamper-Resistant Hex-Drive Steel Button Head Screws

Key Features & Benefits at a Glance

• Enhanced tamper resistance with specialized hex drive design to prevent unauthorized access in security-sensitive applications
• Superior corrosion protection through black-oxide coating that extends service life in demanding industrial environments
• Exceptional mechanical strength with 130,000 psi tensile strength and Rockwell C39 hardness for heavy-duty fastening requirements
• Precise thread engagement with Class 3A fit ensuring reliable performance and vibration resistance in critical assemblies
• Optimized installation efficiency through UNC coarse threading that reduces cross-threading risks during high-volume assembly
• Rounded head profile provides smooth finished appearance while minimizing snagging hazards in exposed applications
• Full regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial deployment

Professional Applications & Engineering Value

These black-oxide alloy steel rounded head screws deliver critical security and reliability for industrial equipment, public infrastructure, and machinery requiring tamper-resistant fastening. The tamper-resistant hex drive (7/32") specifically addresses vandalism concerns in accessible locations while maintaining installation efficiency. Engineered with Class 3A UNC coarse threads, these screws provide superior vibration resistance in high-stress applications where loosening could compromise safety. The combination of 130,000 psi tensile strength and corrosion-resistant black-oxide finish ensures long-term performance in harsh environments, from manufacturing equipment to outdoor installations. These security-focused rounded head screws solve critical fastening challenges where both protection against unauthorized access and mechanical reliability are paramount.

Specification Summary & Compliance

Manufactured to precise Class 3A thread fit tolerances with UNC coarse spacing (3/8"-16) and full threading along the 3/4" length. Complies with ASME B18.3 dimensional specifications where applicable under ASTM F835. Meets current environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) standards regarding substance restrictions. The alloy steel construction achieves Rockwell C39 hardness and 130,000 psi tensile strength for demanding industrial applications.