S-90585A068 3/8"-24 x 1 1/2" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction and passivated finish, ideal for marine, chemical, and outdoor applications.
• High tensile strength of 70,000 psi ensures reliable, long-lasting fastening under substantial mechanical loads, reducing the risk of failure.
• Precise Class 3A thread fit with fine UNF threads provides excellent vibration resistance and secure assembly in high-performance machinery.
• 82° countersink angle and flat head design allow for a flush, low-profile installation, minimizing protrusion and improving safety in tight spaces.
• Hex drive (7/32") enables easy installation and high torque application with standard tools, speeding up assembly and maintenance processes.
• Full threading along the 1-1/2" length offers maximum grip and adjustability, ensuring uniform stress distribution across the fastened materials.
• Compliance with ASME B18.3, RoHS 3, and REACH guarantees adherence to industry standards and environmental regulations, supporting sustainable and safe operations.

Professional Applications & Engineering Value

This 316 stainless steel flat head screw with a UNF 3/8"-24 fine thread and Class 3A fit is engineered to address critical challenges in demanding industrial settings. The combination of high corrosion resistance from the passivated finish and robust 70,000 psi tensile strength makes it ideal for applications in marine equipment, chemical processing, and structural assemblies where exposure to moisture, chemicals, and stress is common. The flat head with an 82° countersink ensures a smooth, flush surface, reducing snag risks and improving aerodynamic or aesthetic profiles in machinery and enclosures. Paired with a hex drive for efficient installation, this screw enhances assembly reliability, minimizes maintenance downtime, and supports long-term performance in industrial fastening systems, from heavy-duty frames to precision instruments.

Specification Summary & Compliance

This fastener features precise dimensional tolerances, including a Class 3A thread fit for superior accuracy and a UNF 3/8"-24 fine thread specification. It meets ASME B18.3 manufacturing standards, ensuring consistent quality and interoperability. Additionally, the screw is RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, confirming adherence to environmental and safety regulations for hazardous substances.