S-90585A695 1/2"-20 x 3/4" 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 chemical and marine environments
• Exceptional thread engagement and vibration resistance from UNF fine threading and Class 3A fit for secure, long-lasting assemblies
• High tensile strength of 70,000 psi ensures reliable performance under heavy loads and stress conditions
• Enhanced durability with Rockwell B55 hardness and passivated finish for increased wear and corrosion protection
• Flush, professional installation with standard 82° countersink angle and flat head design for smooth surface finishes
• Easy, secure driving using a 5/16" hex drive, reducing tool slippage and installation time
• Full threading along the 3/4" length provides maximum grip and adjustability in various material thicknesses

Professional Applications & Engineering Value

These 316 stainless steel flat head screws are engineered to address critical challenges in industrial settings where corrosion, high stress, and precise fit are paramount. The UNF fine thread and Class 3A thread fit deliver superior holding power and vibration resistance, preventing loosening in dynamic applications such as machinery, marine equipment, and chemical processing systems. The passivated finish enhances the innate corrosion resistance of 316 stainless steel, extending service life in aggressive environments. With an 82° countersink angle and flat head profile, these screws sit flush, reducing snag risks and maintaining aerodynamic or clean surface requirements. Fully threaded for maximum engagement, they provide reliable fastening in assemblies demanding high tensile strength and durability, making them a trusted choice for engineers and procurement specialists seeking long-term reliability.

Specification Summary & Compliance

This product adheres to ASME B18.3 specifications, ensuring dimensional accuracy and performance reliability. Threads are manufactured to Class 3A tolerance for precise fit, with UNF fine thread type and size of 1/2"-20. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms environmental safety and regulatory adherence, supporting use in global industrial supply chains.