S-90585A077 1/2"-20 x 2" ASME B18.3 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 thread engagement and reliability provided by the Class 3A UNF fine thread fit for precision applications
• High mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for demanding loads
• Secure and flush installation enabled by the standard 82° countersink angle and flat head design
• Efficient installation and removal with the 5/16" hex drive, preventing cam-out and reducing assembly time
• Full-length thread coverage ensures maximum grip and holding power across the entire 2" length
• Regulatory peace of mind with compliance to 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 corrosive and high-stress environments. The UNF Class 3A fine threading provides superior vibration resistance and precise fit in machinery, automotive, and marine applications where loosening under dynamic loads is a concern. The passivated finish significantly enhances chemical resistance, making it ideal for chemical processing, offshore equipment, and food-grade facilities. With a 70000 psi tensile strength and full threading, it ensures reliable fastening in structural assemblies and heavy-duty enclosures, reducing maintenance cycles and improving operational safety.

Specification Summary & Compliance

This screw features a 1/2"-20 UNF thread with Class 3A tolerance for high precision, an 82° countersink angle, and is fully threaded over its 2" length. It is manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring both performance reliability and regulatory adherence for industrial use.