S-91997A204 8-32 x 5/16" ASME B18.3 Sealing Tamper-Resistant Torx Stainless Steel Button Head Screws

Key Features & Benefits at a Glance

• Superior sealing performance with integrated Buna-N rubber O-ring, preventing leaks in high-pressure environments up to 1500 psi
• Enhanced tamper resistance through specialized T15 Torx drive design, securing critical assemblies from unauthorized access
• Exceptional corrosion resistance from 18-8 stainless steel construction and passivated finish, ensuring longevity in harsh conditions
• Reliable thread engagement with Class 3A UNC coarse threads, providing secure fastening and vibration resistance
• Wide temperature tolerance (-40° to 225°F) for stable performance across diverse industrial environments
• High tensile strength of 70,000 psi for demanding applications requiring robust mechanical integrity
• Streamlined rounded button head profile offering both aesthetic appeal and reduced snagging in confined spaces

Professional Applications & Engineering Value

These 8-32 UNC rounded head screws deliver critical sealing solutions where fluid containment and environmental protection are paramount. The combination of 18-8 stainless steel material and passivated finish creates a formidable barrier against corrosion in chemical processing, marine, and outdoor applications. The integrated Buna-N rubber O-ring maintains reliable seals even under extreme pressure fluctuations, making these tamper-resistant Torx fasteners ideal for secured enclosures, hydraulic systems, and precision instrumentation. The Class 3A thread fit ensures consistent clamping force while the rounded button head design minimizes protrusion in compact assemblies. These features collectively address common industrial challenges including unauthorized tampering, fluid leakage, and corrosion-induced fastener failure.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit and UNC coarse threading for optimal engagement. Fully compliant with ASME B18.3 specifications for dimensional consistency and performance. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring safe use across regulated industries. Thread diameter of 0.164" with 5/16" length provides standardized installation across compatible applications.