S-91870A190 8-32 x 5/16" ASME B18.3 Tamper-Resistant Torx Stainless Steel Flat Head Screws

Key Features & Benefits at a Glance

• Enhanced Security: Tamper-resistant T15 Torx drive prevents unauthorized removal, ideal for public or high-security installations.
• Superior Corrosion Resistance: 18-8 Stainless Steel with passivated finish provides excellent protection against rust and environmental degradation in harsh conditions.
• High Mechanical Strength: 70,000 psi tensile strength and Rockwell B70 hardness ensure reliable, long-term performance under heavy loads and stress.
• Secure Flush Mounting: Undercut flat head design allows for a smooth, countersunk finish that resists tampering and snagging.
• Precision Thread Fit: Class 2A UNC coarse threads offer easy installation and strong holding power in various materials.
• Full Thread Engagement: Fully threaded shank maximizes grip and distribution of clamping force for stable assemblies.
• Regulatory Compliance: Meets ASME B18.3 standards and is RoHS 3 and REACH compliant, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This 8-32 UNC tamper-resistant flat head screw is engineered to address critical needs in industrial and security applications. The combination of 18-8 Stainless Steel and a passivated finish delivers exceptional corrosion resistance, making it suitable for outdoor equipment, marine environments, and chemical processing facilities where moisture and corrosive agents are present. The tamper-resistant T15 Torx drive provides added security against vandalism and unauthorized access, ideal for public infrastructure, electronic enclosures, and machinery requiring controlled maintenance. Its undercut flat head ensures a flush fit, reducing protrusion risks and improving aesthetics. With coarse UNC threading and full threading along the shank, it offers quick installation and robust fastening in metals, plastics, and composites, minimizing loosening from vibrations. This screw is a reliable choice for engineers seeking durability, compliance, and tamper-proof performance in demanding settings.

Specification Summary & Compliance

This screw features precise Class 2A thread fit with UNC coarse threading (8-32 size) for consistent engagement and ease of assembly. It adheres to ASME B18.3 manufacturing standards, ensuring dimensional accuracy and reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and safe for industrial use worldwide.