S-90585A037 1/4"-20 x 5/16" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction, ideal for harsh environments and extended service life
• Exceptional thread reliability due to Class 3A fit, ensuring precise engagement and reducing the risk of cross-threading
• Enhanced durability and strength from a Rockwell B55 hardness and 70,000 psi tensile strength, suitable for high-stress applications
• Secure and flush installation with a standard 82° countersink angle and flat head design, providing a smooth surface finish
• Easy installation and removal featuring a 5/32" hex drive, allowing for efficient torque application with standard tools
• Long-term performance protection through a passivated finish, which improves corrosion resistance and surface durability
• Broad compatibility and compliance meeting ASME B18.3 standards, RoHS 3, and REACH regulations for safe, reliable use

Professional Applications & Engineering Value

This 1/4"-20 UNC Flat Head Screw is engineered to address common industrial challenges such as corrosion, vibration loosening, and assembly inefficiency. Crafted from 316 Stainless Steel, it offers excellent resistance to chemicals and moisture, making it ideal for marine, chemical processing, and outdoor applications. The coarse UNC thread and Class 3A thread fit ensure quick, secure fastening in materials like metal and plastic, reducing installation time and minimizing thread wear. With a passivated finish, it provides an added layer of protection against rust, while the fully threaded design and flat head allow for flush mounting in countersunk holes, enhancing aesthetic appeal and safety in machinery, automotive, and structural assemblies. These features collectively improve reliability, reduce maintenance costs, and support long-term operational integrity in demanding B2B environments.

Specification Summary & Compliance

This fastener adheres to precise dimensional tolerances, including a Class 3A thread fit for high accuracy and a head diameter tolerance of -0.051" to 0". It conforms to ASME B18.3 standards for consistent quality and performance. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and restricted substance-free composition for industrial use.