S-91900A923 5/16"-18 x 1 3/4" ASME B18.3 Tamper-Resistant Torx Stainless Steel Button Head Screws

Key Features & Benefits at a Glance

• Enhanced tamper resistance with specialized Torx T40 drive that prevents unauthorized removal in high-security environments
• Superior corrosion protection through 18-8 stainless steel construction and passivated surface treatment for extended service life
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for heavy-duty applications
• Precision thread engagement with Class 3A UNC coarse threads ensuring reliable fastening in demanding conditions
• Full-threaded design providing maximum grip length and uniform stress distribution across the entire fastener
• Rounded button head profile offering a low-profile, finished appearance while maintaining structural integrity
• Regulatory compliance assurance meeting ASME B18.3 specifications and international environmental standards

Professional Applications & Engineering Value

These tamper-resistant Torx screws deliver critical security and reliability for industrial applications where unauthorized access poses significant risks. The 18-8 stainless steel composition combined with passivated finish creates a robust barrier against corrosion in harsh environments, from outdoor equipment to chemical processing facilities. The T40 tamper-resistant drive system specifically addresses security concerns in public infrastructure, electrical enclosures, and machinery where vandalism or tampering could compromise safety. The Class 3A thread fit ensures precise engagement with mating components, reducing the risk of cross-threading during installation while maintaining consistent clamping force. These rounded head security screws are engineered to withstand vibration and thermal cycling while providing the aesthetic benefits of a smooth, low-profile head design suitable for visible applications.

Specification Summary & Compliance

This security fastener features 5/16"-18 UNC coarse threads with Class 3A tolerance for precision fit, manufactured to ASME B18.3 specifications. The fully threaded design extends the complete 1-3/4" length, while the rounded button head measures 0.547" in diameter. Compliance is verified with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and workplace safety standards are met for global industrial applications.