S-92805A123 2-56 x 1/2" Stainless Steel Thread-Locking Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking through permanent Nylon patch thread locker that maintains secure fastening in dynamic environments
• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for extended service life in harsh conditions
• High-strength performance delivering 70,000 psi tensile strength for reliable load-bearing applications
• Precise thread engagement with Class 3A thread fit ensuring consistent, reliable installation and removal
• Wide temperature tolerance from -65° to 250°F for stable performance across diverse operating environments
• Secure flush mounting with standard 82° countersink angle and flat head design for smooth surface finishing
• Regulatory compliance meeting RoHS 3 and REACH standards for global industrial applications

Professional Applications & Engineering Value

These 2-56 UNC flat head screws with Nylon patch locking technology provide critical vibration resistance in precision assemblies where loosening under dynamic loads poses significant reliability risks. The 18-8 stainless steel construction combined with passivated finish delivers exceptional corrosion protection for demanding environments including marine, automotive, and electronic enclosures. The Class 3A thread fit ensures precise engagement in tapped holes, reducing cross-threading incidents while maintaining consistent clamping force. The 82° countersink angle and flat head profile enable seamless surface integration in machined components, while the temperature-resistant Nylon patch maintains locking integrity across extreme thermal cycles from -65° to 250°F, making these fasteners ideal for aerospace, instrumentation, and industrial equipment applications where reliability cannot be compromised.

Specification Summary & Compliance

This 2-56 UNC flat head screw features precision Class 3A thread fit with coarse thread spacing and right-hand threading. Manufactured from 18-8 stainless steel with Rockwell B55 hardness and full threading along the 1/2" length. The fastener includes 0.050" hex drive compatibility and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards for environmental regulations. The Nylon patch thread locker provides permanent locking functionality while maintaining performance across the specified temperature range.