S-92210A538 1/4"-20 x 9/16" 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, ideal for harsh industrial environments.
• Exceptional holding power from 70,000 psi tensile strength and Class 3A thread fit, ensuring reliable, vibration-resistant connections.
• Streamlined, flush installation with a standard 82° flat head and coarse UNC threads for quick seating and a smooth surface finish.
• High-torque assembly capability via the 5/32" hex drive, preventing cam-out and enabling efficient installation with standard tools.
• Consistent performance and durability backed by Rockwell B55 hardness, maintaining thread integrity and fastener shape under stress.
• Broad industrial compliance meeting ASME B18.3 specifications, RoHS 3, and REACH standards for safe, global use.
• Full-thread engagement along the 9/16" length, providing maximum grip and load distribution in various material thicknesses.

Professional Applications & Engineering Value

Engineered for demanding applications, these 1/4"-20 UNC flat head screws solve critical challenges in machinery, automotive, and structural assemblies. The 18-8 stainless steel material, enhanced by a passivated finish, resists oxidation and chemical exposure, extending service life in moist or corrosive settings. The Class 3A thread fit and coarse UNC threading minimize cross-threading risks during high-speed installation, while the 82° countersink angle ensures a secure, flush fit that reduces protrusion and aerodynamic drag. Ideal for heavy-duty fastening in metal frames, enclosures, and equipment requiring reliable, tamper-resistant joints, these screws deliver consistent performance where precision and durability are non-negotiable.

Specification Summary & Compliance

This product adheres to precise dimensional standards, including Class 3A thread fit for tight tolerances and UNC coarse threads (1/4"-20) per ASME specifications. Manufacturing complies with ASME B18.3 (ASTM F879) for consistent quality, and environmental regulations such as RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) are fully met, ensuring safety and sustainability in industrial supply chains.