S-92865A591 5/16"-18 x 2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 psi provides reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the zinc plating extends service life and maintains integrity in harsh or outdoor environments.
• High hardness rating (Rockwell C25) ensures excellent wear resistance and durability, minimizing deformation under load.
• Coarse UNC threading with Class 2A fit allows for faster assembly and a secure, vibration-resistant grip in various materials.
• Full threading along the 2" length offers maximum adjustability and holding power across the entire fastener.
• External hex drive design enables easy installation and high torque application with standard tools, improving efficiency.
• Compliance with major industry standards (ASME B18.2.1, SAE J429) guarantees consistent quality and interoperability in professional settings.

Professional Applications & Engineering Value

This Grade 5 steel hex head screw is engineered to address common industrial challenges such as joint integrity under dynamic loads and environmental exposure. The zinc plating provides a protective barrier against corrosion, making it ideal for outdoor machinery, automotive assemblies, and structural frameworks where moisture or chemicals are present. The coarse UNC thread and Class 2A thread fit ensure quick, reliable fastening in soft metals or wood, reducing installation time while maintaining a tight, vibration-resistant connection. With a tensile strength of 120,000 psi and full threading, it delivers consistent clamping force and is suited for heavy-duty applications in construction, manufacturing, and equipment repair, where failure is not an option.

Specification Summary & Compliance

This fastener features a 5/16"-18 UNC coarse thread with Class 2A dimensional accuracy for consistent fit and performance. It is manufactured in compliance with ASME B18.2.1 and SAE J429 standards, ensuring adherence to rigorous engineering specifications. Additionally, the product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for hazardous substances.