S-92210A416 6-40 x 1/4" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments
• Exceptional tensile strength rated at 70,000 psi for secure, vibration-resistant fastening in demanding applications
• Precision Class 3A thread fit with UNF fine threading for tighter tolerances and improved load distribution
• Optimized flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
• Enhanced torque transmission through 5/64" hex drive, preventing cam-out and ensuring consistent installation
• Full threading along 1/4" length provides maximum grip and uniform stress distribution across the entire fastener
• Comprehensive compliance with ASME B18.3 standards and environmental regulations including RoHS 3 and REACH

Professional Applications & Engineering Value

These 6-40 UNF flat head screws deliver critical performance advantages for precision assembly applications where corrosion resistance and flush mounting are essential. The combination of 18-8 stainless steel material with passivated finish provides superior protection against oxidation and chemical exposure, making these fasteners ideal for electronics enclosures, aerospace components, and medical devices. The Class 3A thread fit with UNF fine threading ensures precise engagement in tapped holes, reducing the risk of cross-threading while maintaining consistent clamping force. The 82° countersink angle and flat head profile create smooth, aerodynamic surfaces while the hex drive design prevents stripping during high-torque installation. These engineering features collectively address common industrial challenges including vibration loosening, material compatibility issues, and installation efficiency.

Specification Summary & Compliance

This 6-40 UNF flat head screw features precision Class 3A thread fit with right-hand thread direction and fine thread spacing. Manufacturing specifications strictly adhere to ASME B18.3 standards for dimensional accuracy and performance. The fastener meets comprehensive regulatory requirements including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) compliance, ensuring environmental responsibility and material safety. With Rockwell B55 hardness and 70,000 psi tensile strength, these screws deliver consistent mechanical performance across industrial applications.