S-95635A450 1/4"-28 x 1/2" ASME B18.3 Tamper-Resistant Hex-Drive Stainless Steel Button Head Screws

Key Features & Benefits at a Glance

• Enhanced tamper resistance with specialized hex drive design to prevent unauthorized removal in high-security environments
• Superior corrosion protection through 18-8 stainless steel construction and passivated surface treatment for extended service life
• Precise thread engagement with Class 3A UNF fine threads ensuring reliable fastening in critical applications
• High mechanical strength delivering 70,000 psi tensile strength and Rockwell B70 hardness for demanding industrial use
• Optimized head design featuring rounded button profile for reduced snagging and improved aesthetic integration
• Full regulatory compliance meeting ASME B18.3 specifications and environmental standards including RoHS 3 and REACH
• Complete threading along the entire 1/2" length for maximum grip and load distribution

Professional Applications & Engineering Value

This tamper-resistant hex screw addresses critical security and durability challenges in industrial settings where unauthorized access or component tampering presents significant risks. Engineered with 18-8 stainless steel and passivated finish, the fastener provides exceptional resistance to corrosion in harsh environments including outdoor installations, marine applications, and chemical processing facilities. The UNF fine threading with Class 3A fit ensures precise engagement in machinery, electronic enclosures, and public infrastructure where vibration resistance and security are paramount. The combination of 70000 psi tensile strength and specialized 5/32" tamper-resistant drive makes these rounded head screws ideal for permanent installations in transportation equipment, security systems, and industrial machinery requiring reliable, long-term fastening solutions.

Specification Summary & Compliance

Manufactured to exacting dimensional standards with Class 3A thread fit and UNF thread form ensuring precision compatibility. The screw meets ASME B18.3 specifications for dimensional consistency and performance. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, confirming the absence of restricted substances. Critical dimensions include 1/4"-28 thread size with fine thread spacing, 0.437" head diameter, and 1/2" length with fully threaded construction for maximum utility in security-focused applications.