S-92210A581 5/16"-18 x 3/4" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments.
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty applications.
• Precise and secure fastening with Class 3A thread fit, reducing the risk of loosening under vibration and load.
• Efficient installation and removal thanks to the hex drive design, allowing for high torque application without slippage.
• Optimal flush seating with an 82° countersink angle and standard flat head profile for a smooth, professional finish.
• Reliable performance in coarse threading with UNC thread type, ideal for quick assembly in various materials.
• Full regulatory compliance meeting ASME B18.3 standards, RoHS 3, and REACH, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these 5/16"-18 UNC flat head screws provide a robust fastening solution where corrosion resistance and high tensile strength are critical. The 18-8 stainless steel material combined with a passivated finish effectively counters oxidation and chemical exposure, extending service life in machinery, automotive, and construction assemblies. The hex drive style and fully threaded design ensure quick, secure installations, minimizing downtime. With a coarse thread spacing and Class 3A thread fit, these screws deliver consistent clamping force, preventing joint failure in high-vibration environments. Ideal for applications requiring flush mounting, such as metal framing and equipment panels, they enhance structural integrity while complying with industry standards for safety and performance.

Specification Summary & Compliance

This product features precise dimensions including a 5/16"-18 UNC thread size with Class 3A thread fit for tight tolerances, and a length of 3/4". It adheres to ASME B18.3 manufacturing specifications, ensuring consistent quality and interoperability. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it meets environmental and safety requirements for global industrial use.