S-91900A656 3/8"-16 x 1 1/4" ASME B18.3 Tamper-Resistant Torx Stainless Steel Button Head Screws

Key Features & Benefits at a Glance

• Superior tamper resistance with specialized Torx T45 drive that deters unauthorized access in high-security environments
• Exceptional corrosion resistance through 18-8 stainless steel construction and passivated surface treatment for extended service life
• Reliable thread engagement with Class 3A thread fit ensuring precise, vibration-resistant connections in demanding applications
• High mechanical strength delivering 70,000 psi tensile strength and Rockwell B70 hardness for heavy-duty fastening requirements
• Optimized installation efficiency through UNC coarse threading and fully threaded design for faster assembly in industrial settings
• Regulatory compliance assurance meeting ASME B18.3 standards for consistent quality and performance in mechanical systems
• Enhanced safety compliance with RoHS 3 and REACH environmental regulations for use in sensitive applications

Professional Applications & Engineering Value

This 18-8 stainless steel tamper-resistant Torx screw addresses critical engineering challenges in industrial security and corrosion management. The passivated finish creates a protective oxide layer that significantly enhances corrosion resistance in harsh environments, while the T45 tamper-resistant drive provides vital security against unauthorized removal in public infrastructure, machinery guards, and access panels. The Class 3A thread fit with UNC coarse threading ensures reliable engagement even in vibration-prone applications, making these rounded head screws ideal for manufacturing equipment, transportation systems, and outdoor installations where both security and environmental durability are paramount. The combination of 70,000 psi tensile strength and fully threaded design delivers consistent clamping force across the entire fastener length.

Specification Summary & Compliance

This security fastener features precise Class 3A thread fit with UNC 3/8"-16 coarse threads and right-hand threading direction. Manufacturing complies with ASME B18.3 specifications for dimensional accuracy and performance standards. The component is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental regulations for restricted substances. The Rockwell B70 hardness and 70,000 psi tensile strength validate the mechanical properties required for industrial-grade applications.