S-90585A680 5/16"-24 x 1 1/4" 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 like marine or chemical processing.
• Exceptional thread engagement and vibration resistance from the UNF fine thread profile and Class 3A fit, ensuring reliable, secure fastening.
• High mechanical strength and durability with a tensile strength of 70,000 psi and Rockwell B55 hardness for demanding applications.
• Flush, low-profile installation with a standard flat head and 82° countersink angle, perfect for applications where a smooth surface is critical.
• Easy and secure installation using a standard 3/16" hex drive, providing excellent torque transfer and reducing the risk of stripping.
• Enhanced longevity and chemical resistance from the passivated surface finish, which improves the natural corrosion resistance of the stainless steel.
• Full regulatory compliance and quality assurance, meeting ASME B18.3 specifications and being RoHS 3 and REACH compliant for safe, global use.

Professional Applications & Engineering Value

This 316 stainless steel flat head screw is engineered to solve critical challenges in industrial applications where corrosion, strength, and a flush finish are paramount. The UNF fine threading and Class 3A thread fit provide superior resistance to loosening under vibration, a common failure point in machinery and equipment. The combination of 70,000 psi tensile strength and the excellent pitting resistance of 316 stainless steel makes it a reliable choice for demanding environments like marine hardware, chemical processing plants, and food processing equipment. The flat head with an 82° countersink ensures a smooth, aerodynamic surface, preventing snagging and meeting precise engineering requirements. The passivated finish further enhances the screw's durability, ensuring long-term performance and reducing maintenance costs.

Specification Summary & Compliance

This screw features a 5/16"-24 UNF thread with a Class 3A fit for high precision. It is fully threaded and has a standard 82° countersink angle. Manufacturing and dimensional compliance are guaranteed per the ASME B18.3 standard. The product is also confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to strict environmental and safety regulations.