S-91997A207 8-32 x 5/8" 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 to prevent leaks in high-pressure applications up to 1500 psi
• Enhanced tamper resistance through specialized Torx T15 drive design, providing security in public or restricted access environments
• Excellent corrosion resistance from 18-8 stainless steel construction with passivated finish, ensuring long-term reliability in harsh conditions
• Precise thread engagement with Class 3A UNC coarse threads delivering secure fastening and vibration resistance
• Optimized head design featuring a rounded button profile for reduced protrusion and improved aesthetic integration
• Wide temperature compatibility with O-ring performance maintained from -40° to 225° F for diverse operating environments
• High tensile strength of 70,000 psi providing reliable structural integrity under demanding load conditions

Professional Applications & Engineering Value

These 8-32 UNC rounded head screws deliver critical engineering solutions where both security and sealing are paramount. The combination of 18-8 stainless steel material and passivated finish provides exceptional corrosion resistance for outdoor, marine, and chemical processing applications. The integrated Buna-N rubber O-ring creates a reliable seal against fluids and gases, making these fasteners ideal for hydraulic systems, pneumatic equipment, and enclosure sealing where pressure integrity is essential. The tamper-resistant Torx T15 drive prevents unauthorized access in public infrastructure, transportation, and security applications while maintaining installation efficiency. With Class 3A thread fit and standardized dimensions, these screws ensure consistent performance across manufacturing assemblies while reducing maintenance intervals and replacement costs.

Specification Summary & Compliance

This 5/8" length screw features precise Class 3A thread fit with UNC coarse thread spacing and right-hand threading for standardized installation. Manufacturing complies with ASME B18.3 specifications ensuring dimensional accuracy and interoperability. The product meets stringent regulatory requirements including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) compliance, confirming environmental safety and material restrictions adherence. The fully threaded design provides consistent engagement throughout the fastener length, while the 0.312" head diameter and standard rounded head profile maintain industry-standard installation compatibility.