S-95635A540 1/4"-20 x 3/4" 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 access in secure environments
• Superior corrosion protection through 18-8 stainless steel construction and passivated surface treatment
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for heavy-duty applications
• Precise thread engagement with Class 3A UNC coarse threads ensuring reliable fastening performance
• Streamlined installation with rounded button head profile that reduces snagging and provides a finished appearance
• Full regulatory compliance meeting ASME B18.3 standards and environmental regulations including RoHS and REACH
• Complete thread coverage along the entire 3/4" length for maximum grip and load distribution

Professional Applications & Engineering Value

These tamper-resistant hex button head screws provide critical security solutions for industrial equipment, public infrastructure, and access control systems where unauthorized tampering poses significant risks. The 18-8 stainless steel composition combined with passivated finish delivers exceptional resistance to corrosion and chemical exposure, making them ideal for harsh environments including outdoor installations, marine applications, and chemical processing facilities. The Class 3A UNC coarse threads ensure rapid installation with reduced cross-threading risk while maintaining high clamping force. The rounded button head design minimizes protrusion hazards while the tamper-resistant drive prevents disassembly without specialized tools, offering reliable protection for security panels, electronic enclosures, machinery guards, and public fixtures where vandalism or unauthorized access is a concern.

Specification Summary & Compliance

This security fastener features precision 1/4"-20 UNC coarse threads manufactured to Class 3A tolerance for superior fit and reliability. The screw complies with ASME B18.3 dimensional standards and meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) requirements. Manufacturing specifications include full threading along the 3/4" length, tamper-resistant hex drive (5/32"), and standardized button head profile with 0.437" diameter and 0.132" height, ensuring consistent performance across industrial applications.