S-91997A206 8-32 x 1/2" ASME B18.3 Sealing Tamper-Resistant Torx Stainless Steel Button Head Screws

Key Features & Benefits at a Glance

• Enhanced Security & Tamper Resistance: The Tamper-Resistant Torx T15 drive prevents unauthorized removal, ideal for public or high-security installations.
• Superior Corrosion Resistance & Durability: Made from 18-8 Stainless Steel with a passivated finish for excellent protection against rust and harsh environments.
• Reliable Pressure Sealing: Integrated Buna-N Rubber O-ring ensures a tight seal, effectively containing fluids and gases up to 1500 psi.
• High Tensile Strength & Thread Reliability: With a 70,000 psi tensile strength and Class 3A thread fit, it provides secure, vibration-resistant fastening in demanding applications.
• Broad Temperature Compatibility: The O-ring maintains sealing integrity across a wide temperature range from -40° to 225° F, suitable for various operational conditions.
• Optimized for Industrial Standards: Features UNC coarse threads and a rounded button head for easy installation and a clean finish, meeting rigorous ASME B18.3 specifications.
• Environmental & Regulatory Compliance: Fully compliant with RoHS 3 and REACH standards, ensuring safety and sustainability in industrial use.

Professional Applications & Engineering Value

This 8-32 x 1/2" rounded head screw is engineered to address critical challenges in industrial assembly, where security, sealing, and durability are paramount. The combination of 18-8 stainless steel and a passivated finish offers superior corrosion resistance, extending service life in moist or chemical-exposed environments. The Tamper-Resistant Torx T15 drive deters vandalism and unauthorized access, making it perfect for public infrastructure, electrical enclosures, and machinery panels. Its Buna-N rubber O-ring provides a dependable seal against leaks, supporting applications in fluid systems, pneumatic controls, and outdoor equipment subjected to pressures up to 1500 psi. With a Class 3A thread fit and fully threaded design, it ensures precise engagement and high clamp load, reducing the risk of loosening under vibration. This screw delivers consistent performance in temperature ranges from -40° to 225°F, ideal for automotive, aerospace, and HVAC systems requiring reliable, long-term fastening solutions.

Specification Summary & Compliance

This screw adheres to precise dimensional and performance standards, including Class 3A thread fit for tight tolerances and UNC coarse threading (8-32 size) to facilitate quick assembly. It is manufactured in compliance with ASME B18.3 specifications for consistent quality and interoperability. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and safe for industrial and environmental use.