S-92210A552 1/4"-20 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 construction and passivated finish, ideal for harsh industrial environments.
• Exceptional holding power from 70,000 psi tensile strength and Rockwell B55 hardness, ensuring reliable, long-term fastening.
• Precise, secure thread engagement with Class 3A UNC coarse threads, minimizing the risk of cross-threading and loosening under vibration.
• Streamlined, flush installation thanks to the standard flat head with 82° countersink angle, providing a smooth surface finish.
• High-torque installation capability with a 5/32" hex drive, allowing for secure driving and reducing tool slippage.
• Full-length threading for maximum grip along the entire 2 1/2" length, enhancing load distribution in demanding applications.
• Guaranteed reliability and compliance by meeting ASME B18.3 standards and being RoHS 3 & REACH compliant for safe, global use.

Professional Applications & Engineering Value

This 1/4"-20 UNC flat head screw is engineered to solve critical fastening challenges in industrial settings. Its 18-8 stainless steel material and passivated finish provide excellent resistance to corrosion and oxidation, making it ideal for machinery, outdoor equipment, and chemical processing applications where environmental durability is paramount. The Class 3A thread fit and coarse threading ensure quick assembly and superior vibration resistance, reducing maintenance needs. The flat head design with an 82° countersink allows for a seamless, flush mount, preventing snagging and improving safety in automated systems. Fully threaded for maximum holding strength, this screw delivers consistent performance in heavy-duty assemblies, from metal framing to conveyor systems, ensuring operational integrity and reducing downtime.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including UNC coarse threads with a Class 3A fit for tight tolerances and reliable engagement. Manufactured in accordance with ASME B18.3 specifications, it ensures consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in restricted substance-sensitive applications. With a length of 2 1/2", fully threaded design, and 82° countersink angle, it meets rigorous industrial requirements for durability and environmental responsibility.