S-95635A576 5/16"-18 x 1 1/2" Tamper-Resistant Hex-Drive Stainless Steel Button Head Screws

Key Features & Benefits at a Glance

• Enhanced tamper resistance with specialized hex drive design prevents unauthorized removal in high-security applications
• Superior corrosion protection through 18-8 stainless steel construction and passivated finish for extended service life in harsh environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for reliable load-bearing performance
• Precision thread engagement with Class 3A thread fit ensures secure fastening and vibration resistance in critical assemblies
• Optimized partial threading provides superior clamping force distribution while preventing thread damage
• Regulatory compliance assurance with RoHS 3 and REACH standards for global market acceptance and environmental safety
• Secure rounded button head profile combines tamper-resistant functionality with smooth, low-profile appearance

Professional Applications & Engineering Value

These 5/16"-18 UNC tamper-resistant hex screws deliver critical security solutions for industrial applications where unauthorized access poses significant risks. The 18-8 stainless steel composition, enhanced by passivated finish, provides exceptional resistance to corrosion and chemical exposure, making them ideal for outdoor equipment, marine environments, and chemical processing facilities. The tamper-resistant hex drive design specifically addresses security vulnerabilities in public infrastructure, electrical enclosures, and transportation systems where standard fasteners could be easily removed. With Class 3A thread fit and coarse thread spacing, these screws maintain reliable performance under vibration and dynamic loading conditions, while the partially threaded configuration ensures optimal clamping force without compromising joint integrity. The combination of 70,000 psi tensile strength and Rockwell B70 hardness provides the durability needed for permanent installations and high-stress applications.

Specification Summary & Compliance

This security fastener features precision 5/16"-18 UNC coarse threads with Class 3A thread fit for superior engagement and tolerance control. The manufacturing complies with industry standards for dimensional accuracy, including 1½" length with 1⅛" minimum thread length. The 3/16" tamper-resistant hex drive provides secure installation while the 0.547" head diameter and standard rounded button head profile ensure proper seating and distribution of clamping forces. Regulatory compliance is confirmed with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring environmental safety and global market acceptance for industrial and commercial applications.