S-92240A597 5/16"-18 x 3 1/2" ASME B18.2.1 18-8 Stainless Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and long-term durability.
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B70 hardness for reliable performance under high stress.
• Easy installation and removal thanks to the external hex drive and standard right-hand UNC coarse thread design.
• Precise thread engagement with Class 2A thread fit ensuring consistent, vibration-resistant connections.
• Full-length threading provides maximum grip and load distribution along the entire 3 1/2" shank.
• Compliance with major standards including ASME B18.2.1 for dimensional accuracy and RoHS 3/REACH for environmental safety.
• Versatile industrial use in machinery, construction, and structural assemblies requiring coarse thread fasteners.

Professional Applications & Engineering Value

This 5/16"-18 UNC hex head screw is engineered to address critical challenges in industrial fastening, such as corrosion, vibration loosening, and high tensile loads. The 18-8 stainless steel material offers excellent resistance to rust and chemical exposure, making it suitable for outdoor, marine, and chemical processing applications. The coarse thread and Class 2A thread fit ensure quick assembly and reliable performance in materials where fine threads may strip or fail. With an external hex drive, it allows for high torque application using standard tools, reducing installation time and improving efficiency in assembly lines, structural steel connections, and heavy equipment maintenance. Its fully threaded design maximizes holding power, distributing stress evenly to prevent joint failure.

Specification Summary & Compliance

This screw features a 5/16"-18 UNC coarse thread with Class 2A thread fit for standard dimensional tolerance, ensuring compatibility with common nuts and tapped holes. It meets ASME B18.2.1 specifications for hex head cap screws, guaranteeing consistent quality and interchangeability. The product is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and safe for use in various industrial and international markets.