S-92198A693 5/16"-18 x 2 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 or outdoor environments
• High mechanical strength with 80,000 psi tensile strength and Rockwell B70 hardness for reliable load-bearing in demanding applications
• Secure and stable fastening ensured by the Class 2A thread fit, minimizing the risk of loosening under vibration
• Easy installation and removal with the external hex drive and standard 1/2" head width, compatible with common tools
• Optimized for coarse-thread applications using the 5/16"-18 UNC thread, providing excellent performance in brittle materials or where rapid assembly is needed
• Versatile partial threading allows for a combination of strong clamping force and unthreaded shank strength
• Full regulatory compliance with ASME B18.2.1, RoHS 3, and REACH, ensuring safety and environmental standards are met

Professional Applications & Engineering Value

This 5/16"-18 UNC hex head screw is engineered to address common industrial challenges such as material fatigue, corrosion, and assembly efficiency. The 18-8 Stainless Steel composition provides excellent resistance to rust and oxidation, making it suitable for applications in marine, chemical processing, and food-grade equipment where environmental factors are a concern. The coarse UNC thread and Class 2A fit deliver reliable engagement in various substrates, reducing the risk of cross-threading and ensuring consistent clamping force in structural assemblies, machinery, and heavy-duty frameworks. The partially threaded design offers a balance between the shear strength of the unthreaded shank and the holding power of the threaded portion, ideal for securing components that experience dynamic loads or thermal expansion.

Specification Summary & Compliance

This hex head screw features a 5/16"-18 UNC coarse thread with a Class 2A thread fit for standard tolerance and interchangeability. It is manufactured in compliance with ASME B18.2.1 specifications, ensuring dimensional accuracy and performance consistency. The product is also confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to environmental and safety regulations for hazardous substances.