S-92210A536 1/4"-20 x 7/16" ASME B18.3, ASTM F879 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 mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
• Precision thread engagement with Class 3A fit providing secure, vibration-resistant fastening in critical assemblies
• Optimized flush mounting featuring standard 82° countersink angle and flat head design for seamless surface integration
• Enhanced installation efficiency through 5/32" hex drive design enabling high-torque application without cam-out
• Full-threaded reliability ensuring maximum grip strength across the entire 7/16" length for uniform load distribution
• Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial acceptance

Professional Applications & Engineering Value

These 1/4"-20 UNC flat head screws deliver critical engineering solutions where surface flushness and corrosion resistance are paramount. The 18-8 Stainless Steel composition with passivated finish provides exceptional protection against chemical exposure and atmospheric corrosion, making them ideal for marine, food processing, and outdoor equipment applications. The Class 3A thread fit ensures precise engagement in tapped holes, reducing the risk of cross-threading while maintaining vibration resistance in dynamic load conditions. The combination of 70,000 psi tensile strength and fully threaded design creates reliable fastening in thin materials and high-stress assemblies, while the 82° countersink angle allows for perfect flush mounting in precision machinery and structural components.

Specification Summary & Compliance

Manufactured to exacting dimensional standards with Class 3A thread fit per UNC specifications, these flat head screws feature a 0.531" head diameter and 7/16" length with complete threading. The 5/32" hex drive provides secure tool engagement, while the standard 82° countersink angle ensures proper seating. Compliance is verified with ASME B18.3 manufacturing specifications, RoHS 3 (2015/863/EU) for hazardous substance restriction, and REACH (EC 1907/2006) regulations for chemical safety, ensuring global acceptance across industrial sectors.