S-91997A219 10-32 x 3/4" ASME B18.3 Sealing Tamper-Resistant Torx Stainless Steel Button Head Screws

Key Features & Benefits at a Glance

• Superior Sealing Performance: Integrated Buna-N rubber O-ring creates a reliable seal against fluids and contaminants, ideal for pressurized environments up to 1500 psi.
• Exceptional Corrosion Resistance: Made from 18-8 Stainless Steel with a passivated finish, offering excellent durability in harsh or humid conditions.
• Enhanced Security & Tamper-Resistance: Tamper-Resistant Torx T25 drive prevents unauthorized removal, securing critical assemblies in public or high-security applications.
• Precise & Reliable Threading: Class 3A UNF fine threads ensure a tight, vibration-resistant fit, reducing the risk of loosening under dynamic loads.
• Wide Temperature Tolerance: O-ring maintains integrity across a broad temperature range from -40° to 225° F, suitable for both extreme cold and heat.
• High Mechanical Strength: With a tensile strength of 70,000 psi and Rockwell B70 hardness, this screw withstands high stress without deformation.
• Streamlined, Low-Profile Design: The rounded button head minimizes protrusion, reducing snag risks and providing a clean, finished appearance.

Professional Applications & Engineering Value

This 10-32 UNF rounded head screw is engineered to solve critical challenges in industrial sealing and security. Its 18-8 stainless steel construction and passivated finish resist corrosion, making it ideal for outdoor equipment, marine hardware, and chemical processing units. The Buna-N rubber O-ring ensures a leak-proof seal in hydraulic systems, pneumatic controls, and fluid transfer lines, handling pressures up to 1500 psi. The tamper-resistant Torx T25 drive adds a layer of security, preventing tampering in public infrastructure, transportation, or electronic enclosures. With Class 3A fine threading, it maintains clamp force under vibration, reducing maintenance needs in machinery, automotive assemblies, and aerospace components. This combination of sealing capability, material durability, and secure drive design delivers long-term reliability and performance in demanding B2B applications.

Specification Summary & Compliance

This screw features 10-32 UNF fine threads with a Class 3A thread fit for high precision and consistent engagement. It is manufactured in compliance with ASME B18.3 standards, ensuring dimensional accuracy and interchangeability. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for hazardous substances. Additional specifications include a length of 3/4 inch, fully threaded design, and a maximum recommended hole diameter of 0.2 inch.