S-91997A205 8-32 x 3/8" 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-rings that withstand pressures up to 1500 psi and temperatures from -40° to 225°F, preventing leaks in demanding environments.
• Enhanced tamper resistance through the T15 Torx drive design, providing security against unauthorized removal in public or high-risk installations.
• Exceptional corrosion resistance from 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in humid or corrosive conditions.
• Precise thread engagement with Class 3A fit and UNC coarse threading, delivering reliable fastening and vibration resistance in industrial assemblies.
• High tensile strength of 70,000 psi, offering robust load-bearing capacity for critical applications without failure.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety, quality, and environmental responsibility.
• Easy installation and removal with the rounded button head profile, reducing surface damage and improving aesthetics in finished products.

Professional Applications & Engineering Value

These 8-32 UNC tamper-resistant Torx screws are engineered to address common industrial challenges such as fluid leakage, unauthorized access, and environmental degradation. The 18-8 stainless steel material, combined with a passivated finish, provides excellent resistance to rust and chemicals, making them ideal for outdoor equipment, marine hardware, and chemical processing plants. The integrated Buna-N rubber O-ring ensures a reliable seal in high-pressure systems up to 1500 psi, preventing costly downtime from leaks in hydraulic or pneumatic applications. With a Class 3A thread fit and coarse UNC threading, these screws offer quick assembly and secure holding power in machinery, electronics enclosures, and automotive components, reducing maintenance needs and enhancing operational safety.

Specification Summary & Compliance

This screw features precise Class 3A thread fit per UNC standards, ensuring tight tolerances for reliable fastening. It is manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global markets. The fully threaded design and coarse thread spacing provide consistent performance, while the passivated finish on 18-8 stainless steel enhances durability and corrosion resistance in accordance with industrial best practices.