S-91900A922 5/16"-18 x 5/8" ASME B18.3 Tamper-Resistant Torx Stainless Steel Button Head Screws

Key Features & Benefits at a Glance

• Enhanced tamper resistance with specialized T40 Torx drive that deters unauthorized access in secure facilities
• Superior corrosion resistance through 18-8 stainless steel construction and passivated surface treatment
• Reliable thread engagement with Class 3A thread fit ensuring precise mating and vibration resistance
• High mechanical strength delivering 70,000 psi tensile strength for demanding industrial applications
• Optimized installation efficiency with fully threaded design and coarse UNC thread spacing
• Reduced surface damage from rounded button head profile that minimizes marring of assembled surfaces
• Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations

Professional Applications & Engineering Value

These tamper-resistant Torx screws provide critical security solutions for industrial equipment, public infrastructure, and access panels where unauthorized tampering poses operational risks. The 18-8 stainless steel material combined with passivated finish creates exceptional resistance to corrosion and chemical exposure in harsh environments. The Class 3A thread fit and coarse UNC threading ensure rapid installation while maintaining vibration resistance in high-stress applications. The rounded button head design offers a low-profile secure fastening solution that prevents snagging while the T40 drive system provides superior torque transmission compared to conventional security fasteners. These fully threaded screws are engineered for permanent installations where disassembly should be restricted to authorized personnel only.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit tolerance and UNC coarse thread spacing. These security screws conform to ASME B18.3 specifications for dimensional accuracy and performance. The fasteners demonstrate compliance with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety. Mechanical properties include Rockwell B70 hardness and 70,000 psi tensile strength, validated through quality control processes. The 5/8" length and 5/16"-18 UNC thread size provide standardized compatibility across industrial applications.