S-92865A594 5/16"-18 x 2 3/4" 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 ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
• Zinc plating provides superior corrosion resistance, extending the screw's service life in harsh or outdoor environments.
• Grade 5 steel construction with Rockwell C25 hardness offers excellent durability and wear resistance for repeated use.
• Fully threaded UNC coarse thread design allows for faster installation and secure gripping in a wide range of materials.
• Class 2A thread fit ensures consistent, precise engagement with nuts and tapped holes, minimizing assembly issues.
• External hex drive and hex head enable easy tightening with standard tools, improving installation efficiency.
• Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interoperability in mechanical assemblies.

Professional Applications & Engineering Value

This 5/16"-18 UNC Grade 5 zinc plated steel hex head screw is engineered to address common challenges in heavy-duty industrial settings, such as vibration loosening and environmental corrosion. The coarse thread design provides strong holding power in softer materials or where quick assembly is critical, while the fully threaded body ensures maximum thread engagement for distributed load bearing. Made from high-strength Grade 5 steel, it withstands tensile stresses up to 120,000 psi, making it ideal for construction machinery, automotive frames, and structural supports. The zinc plating adds a protective layer that resists rust and oxidation, prolonging fastener life in moist or chemically exposed environments. Its external hex drive allows for high-torque application with common wrenches, streamlining maintenance and reducing downtime in production lines.

Specification Summary & Compliance

This hex head screw features a 5/16"-18 UNC coarse thread with Class 2A thread fit for standard dimensional accuracy and easy assembly. It meets ASME B18.2.1 and SAE J429 specifications, ensuring consistent manufacturing quality. The product is also 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.