S-92865A580 5/16"-18 x 5/8" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 120,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance due to zinc plating, extending service life in various environmental conditions
• High-strength Grade 5 steel construction with Rockwell C25 hardness for excellent durability and wear resistance
• Easy installation and removal with external hex drive design providing secure tool engagement
• Reliable thread engagement with Class 2A thread fit ensuring consistent fastening performance
• Optimized for heavy-duty applications through full UNC coarse threading for superior holding power
• Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for quality assurance

Professional Applications & Engineering Value

This Grade 5 steel hex head screw delivers exceptional engineering value for industrial applications requiring high tensile strength and reliable fastening. The 5/16"-18 UNC coarse threading provides superior resistance to vibration loosening while enabling quick installation in heavy machinery, construction equipment, and automotive assemblies. The zinc plated finish offers critical corrosion protection in environments where moisture or chemical exposure could compromise fastener integrity. With fully threaded design and Class 2A thread fit, these screws maintain consistent clamping force across the entire length, preventing joint failure in structural applications. The external hex drive configuration ensures maximum torque transmission without stripping, making them ideal for high-stress connections in manufacturing, infrastructure, and mechanical systems.

Specification Summary & Compliance

This 5/16"-18 UNC hex head screw features precise Class 2A thread fit per ASME standards, ensuring dimensional accuracy and proper mating with corresponding nuts. Manufactured to meet ASME B18.2.1 and SAE J429 Grade 5 specifications, the fastener delivers consistent mechanical properties including 120,000 psi tensile strength and Rockwell C25 hardness. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, containing no restricted substances. The right-hand threaded configuration with coarse thread spacing provides optimal performance in most industrial fastening applications.