S-90517A211 8-32 x 3/8" ASME B18.3 Tamper-Resistant Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Enhanced tamper resistance with specialized hex drive design prevents unauthorized removal in high-security environments
• Superior corrosion protection through 18-8 stainless steel construction and passivated finish for extended service life
• Exceptional mechanical strength delivering 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
• Precision thread engagement with Class 3A fit and UNC coarse threading ensures reliable fastening performance
• Optimized flush mounting featuring 82° countersink angle and standard flat head profile for seamless surface integration
• Full regulatory compliance meeting ASME B18.3 standards with RoHS 3 and REACH environmental directives
• Complete thread coverage along the 3/8" length provides maximum grip and load distribution

Professional Applications & Engineering Value

Engineered for high-security industrial applications, these 8-32 UNC flat head tamper-resistant hex screws address critical challenges in public infrastructure, machinery guarding, and access control systems. The 18-8 stainless steel material combined with passivated finish creates a robust barrier against corrosive elements, significantly extending maintenance intervals in harsh environments. The tamper-resistant hex drive design provides an essential security layer where unauthorized access poses operational risks. With Class 3A thread fit and coarse UNC threading, these screws deliver consistent clamping force while resisting vibration-induced loosening. The 82° countersink angle ensures proper seating in standard chamfered holes, creating flush surfaces that prevent snagging and maintain aesthetic integrity in visible applications.

Specification Summary & Compliance

This fully threaded screw maintains precise Class 3A thread fit according to UNC standards with 8-32 thread size and coarse spacing. Manufacturing complies with ASME B18.3 specifications for dimensional accuracy and performance requirements. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) compliance for chemical safety, ensuring environmental responsibility in industrial supply chains.