S-90585A147 5/16"-24 x 1 1/2" ASME B18.3, ASTM F879 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments due to 316 stainless steel construction and passivated finish.
• Exceptional mechanical strength with a 70,000 psi tensile strength and Rockwell B55 hardness for reliable, long-term performance under load.
• Precise and secure fastening ensured by Class 3A thread fit and 5/16"-24 UNF fine threads, providing excellent vibration resistance and holding power.
• Flush, low-profile installation with a standard 82° countersink angle and flat head design for a smooth, finished surface.
• Efficient installation and removal facilitated by a 3/16" hex drive, allowing for high torque application with standard tools.
• Full thread engagement along the 1 1/2" length for maximum grip and load distribution in a wide range of material thicknesses.
• Guaranteed quality and material safety through compliance with ASME B18.3, RoHS 3, and REACH standards.

Professional Applications & Engineering Value

This 316 Stainless Steel Flat Head Screw is engineered to solve critical challenges in demanding industrial settings. Its core value lies in its corrosion-resistant material and passivated finish, which protect against chemical and saline degradation, making it ideal for marine, chemical processing, and food-grade equipment. The combination of high tensile strength and Class 3A UNF fine threads ensures a secure, vibration-resistant connection in high-stress assemblies, preventing loosening in machinery and structural applications. The flat head with an 82° countersink allows for a flush mount, eliminating protrusions for safer operation and a cleaner aesthetic. This screw delivers reliable performance where failure is not an option, from industrial fasteners in heavy machinery to critical components in infrastructure.

Specification Summary & Compliance

This product features a 5/16"-24 UNF thread with a precision Class 3A thread fit and is fully threaded. It is manufactured in compliance with the ASME B18.3 specification (ASTM F879) and conforms to material safety regulations, including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006).