S-92210A109 4-40 x 7/16" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Superior holding power from fully threaded design and Class 3A thread fit, ensuring reliable fastening in demanding applications
• High mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for long-term durability under stress
• Precision countersinking with 82° flat head profile for flush mounting and reduced protrusion in assembled components
• Easy installation and removal using standard 1/16" hex drive, compatible with common industrial tools
• Regulatory compliance assurance meeting ASME B18.3 standards, RoHS 3, and REACH for global supply chain integration
• Optimized thread engagement with coarse UNC threading providing rapid assembly and vibration resistance

Professional Applications & Engineering Value

These 4-40 UNC flat head screws deliver critical performance where flush surface mounting and corrosion resistance are paramount. The 18-8 stainless steel material combined with passivated finish creates a protective barrier against chemical exposure and oxidation, extending service life in manufacturing equipment, electronic enclosures, and marine components. The fully threaded configuration maximizes grip length across the entire shank, distributing clamp load evenly to prevent joint loosening under vibration. With Class 3A thread fit precision and 82° countersink angle, these screws seat perfectly in tapered holes, eliminating gap formation while maintaining aerodynamic or hydraulic surface continuity. Engineered for heavy-duty industrial fastening, they provide reliable connections in machinery, transportation systems, and precision instruments where failure is not an option.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit ensuring precise dimensional accuracy. The UNC coarse thread (4-40) provides optimal engagement in various materials. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental responsibility. Mechanical properties include 70,000 psi tensile strength and Rockwell B55 hardness for consistent performance. Standard 82° countersink angle matches common industrial requirements for flush mounting applications.