S-91870A765 3/8"-16 x 2 1/2" ASME B18.3 Tamper-Resistant Torx Stainless Steel Flat Head Screws

Key Features & Benefits at a Glance

• Superior tamper resistance with T45 Torx drive design to prevent unauthorized access in security-sensitive environments
• Exceptional corrosion resistance through 18-8 stainless steel construction and passivated surface treatment for long-term reliability
• High mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness to withstand heavy loads and vibration
• Precision thread engagement with Class 3A UNC coarse threads ensuring secure fastening and reduced cross-threading risk
• Optimal countersinking featuring 82° flat head profile for flush mounting and clean aesthetic finish
• Full-threaded design providing maximum grip length and load distribution across the entire fastener
• Regulatory compliance meeting ASME B18.3 standards and environmental regulations for global industrial applications

Professional Applications & Engineering Value

This 18-8 stainless steel flat head screw with tamper-resistant Torx drive addresses critical security and durability challenges in industrial settings. The combination of passivated finish and stainless steel material provides exceptional resistance to corrosion, making it ideal for harsh environments including outdoor installations, chemical processing facilities, and marine applications. The Class 3A thread fit with UNC coarse threading ensures reliable engagement in various materials while the T45 drive system prevents tampering in public infrastructure, electrical enclosures, and machinery where unauthorized access poses safety risks. The 82° countersink angle allows for seamless flush mounting in precision assemblies, while the full threading maximizes pull-out strength in demanding structural applications.

Specification Summary & Compliance

This fastener maintains precision Class 3A thread fit according to UNC standards with 3/8"-16 coarse thread spacing and right-hand orientation. Manufacturing specifications comply with ASME B18.3 standards for dimensional accuracy and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets. The 2-1/2" length and fully threaded design provide consistent performance while the Rockwell B70 hardness and 70,000 psi tensile strength guarantee mechanical reliability in critical applications.