S-96669A233 1/4"-20 x 5/8" ASME B18.3 Sealing Tamper-Resistant Torx Flat Head Screws

Key Features & Benefits at a Glance

• Enhanced Security: Tamper-resistant T30 Torx drive prevents unauthorized removal, ideal for public or high-security applications.
• Reliable Sealing Under Pressure: Integrated Buna-N rubber O-ring ensures a tight seal capable of withstanding up to 1500 psi, preventing leaks in pressurized systems.
• Superior Corrosion Resistance: Made from 18-8 stainless steel with a passivated finish, offering excellent durability in harsh or moist environments.
• Wide Temperature Tolerance: O-ring functions effectively from -40 to 225°F, making it suitable for applications with extreme temperature fluctuations.
• High Tensile Strength: With a tensile strength of 70,000 psi, this screw provides reliable fastening for demanding mechanical assemblies.
• Optimized for Flush Mounting: Undercut flat head design allows for a clean, countersunk finish, reducing snagging and improving aesthetics.
• Consistent Thread Engagement: UNC coarse threads with Class 2A fit ensure easy installation and secure holding power in a variety of materials.

Professional Applications & Engineering Value

This 1/4"-20 x 5/8" flat head screw is engineered to solve critical challenges in industrial and security-focused applications. The combination of 18-8 stainless steel and a passivated finish provides exceptional resistance to corrosion, extending service life in outdoor or chemically aggressive settings. The tamper-resistant Torx drive (T30) deters vandalism and unauthorized access, making it perfect for public infrastructure, machinery guards, and electronic enclosures. The inclusion of a Buna-N rubber O-ring addresses the need for reliable sealing in fluid and gas systems, capable of handling pressures up to 1500 psi. Its fully threaded design and UNC coarse thread facilitate quick assembly and strong retention, while the undercut flat head ensures a smooth, flush surface to prevent interference and improve safety in moving parts.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC coarse thread with a Class 2A thread fit for standard tolerance and reliable engagement. It is manufactured in compliance with ASME B18.3 specifications, ensuring dimensional accuracy and performance consistency. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming it meets stringent environmental and safety regulations for hazardous substances.