S-91870A320 3/8"-16 x 3/4" ASME B18.3 Tamper-Resistant Torx Stainless Steel Flat Head Screws

Key Features & Benefits at a Glance

• Enhanced tamper resistance with T45 Torx drive prevents unauthorized removal in high-security environments
• Superior corrosion protection through 18-8 stainless steel construction and passivated surface treatment
• Reliable fastening performance with 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications
• Optimized thread engagement through Class 2A UNC coarse threading ensures consistent clamping force
• Streamlined installation with standard 82° countersink angle for flush mounting in various materials
• Regulatory compliance meets ASME B18.3 specifications and international environmental standards (RoHS 3, REACH)
• Full-thread design provides maximum grip length and load distribution across the entire fastener

Professional Applications & Engineering Value

This 3/8"-16 UNC flat head screw delivers critical security and durability for industrial applications where tampering prevention and environmental resistance are paramount. The 18-8 stainless steel construction combined with passivated finish creates a robust barrier against corrosion in harsh operating conditions, from manufacturing facilities to outdoor installations. The tamper-resistant T45 Torx drive system ensures that only authorized personnel with matching tools can access secured equipment, making it ideal for public infrastructure, electrical enclosures, and machinery requiring controlled maintenance access. The fully threaded UNC coarse spacing provides rapid installation and reliable holding power in metal, wood, and composite materials, while the standardized flat head profile with 82° countersink enables seamless surface integration without protrusion.

Specification Summary & Compliance

This security fastener maintains Class 2A thread fit tolerance according to UNC standards, ensuring precise dimensional accuracy and consistent performance. Manufacturing compliance includes ASME B18.3 specifications for dimensional integrity and mechanical properties. Environmental regulatory adherence covers RoHS 3 (2015/863/EU) compliance for restricted substance control and REACH (EC 1907/2006) compliance for chemical safety management. The combination of 70,000 psi tensile strength and Rockwell B70 hardness validates the screw's structural reliability for industrial fastening requirements.