S-92865A582 5/16"-18 x 7/8" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capability with 120,000 psi tensile strength for reliable performance in high-stress applications
• Superior corrosion resistance provided by zinc plating, extending service life in harsh environments
• Precise thread engagement with Class 2A fit and UNC coarse threads ensuring secure fastening and easy installation
• Optimized torque transmission through external hex drive design for efficient assembly with standard tools
• Consistent mechanical properties backed by Grade 5 certification and Rockwell C25 hardness for dependable performance
• Full threading coverage along the 7/8" length for maximum grip and uniform stress distribution
• Regulatory compliance assurance meeting ASME B18.2.1 and SAE J429 standards for quality and safety

Professional Applications & Engineering Value

This Grade 5 steel hex head screw delivers critical engineering solutions where vibration resistance and structural integrity are paramount. The zinc plated finish provides essential corrosion protection for outdoor equipment, machinery assemblies, and structural frameworks exposed to environmental elements. With its UNC coarse thread pattern and Class 2A thread fit, this fastener maintains secure connections in high-vibration environments common in automotive, construction, and heavy equipment applications. The external hex drive design enables high-torque installation without stripping, while the fully threaded configuration ensures maximum engagement depth for critical joints. Engineered to withstand repetitive loading cycles, this 5/16"-18 hex head screw provides reliable performance in demanding industrial settings where fastener failure is not an option.

Specification Summary & Compliance

This fastener maintains precise Class 2A thread fit tolerances per UNC standards with 5/16"-18 thread size and coarse thread spacing. Manufacturing complies with ASME B18.2.1 and SAE J429 Grade 5 specifications, ensuring consistent dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming adherence to international substance restriction standards for industrial components.