S-92210A430 1/4"-28 x 2 1/2" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel and passivated finish, ideal for harsh environments
• Exceptional tensile strength of 70,000 psi ensures reliable, long-lasting fastening under high stress
• Precise Class 3A thread fit guarantees secure engagement and reduces the risk of cross-threading
• Fully threaded design provides maximum grip and uniform load distribution along the entire length
• 82° countersink angle allows for a flush, professional finish in countersunk applications
• Hex drive compatibility with 5/32" drive enables high torque application and easy installation
• Compliance with ASME B18.3, RoHS 3, and REACH ensures quality, safety, and environmental standards are met

Professional Applications & Engineering Value

These 1/4"-28 UNF flat head screws are engineered to address critical industrial fastening challenges where precision, strength, and corrosion resistance are paramount. The 18-8 Stainless Steel construction, combined with a passivated finish, provides excellent protection against rust and chemical exposure, making them ideal for marine, chemical processing, and outdoor equipment. The Class 3A thread fit and fine thread spacing ensure tight, vibration-resistant connections in machinery, aerospace components, and automotive assemblies. With a fully threaded design and 82° countersink angle, they offer seamless integration into flush-mounted applications, reducing protrusion and improving aerodynamic or aesthetic profiles. This combination of material durability and precise engineering delivers reliable performance in demanding environments, minimizing maintenance and replacement costs.

Specification Summary & Compliance

This screw features a 1/4"-28 UNF thread with Class 3A thread fit for high precision and tight tolerances. It complies with ASME B18.3 specifications, ensuring consistent manufacturing quality. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for hazardous substances. Additional specifications include a right-hand thread direction, standard flat head profile, and full threading along the 2 1/2" length.