S-92865A592 5/16"-18 x 2 1/4" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior load-bearing capability with 120,000 psi tensile strength, ideal for high-stress industrial assemblies
• Enhanced corrosion resistance from zinc plating, extending service life in demanding environments
• Reliable torque transmission via external hex drive and 1/2" head width for secure installation
• Optimized thread engagement with UNC coarse spacing and Class 2A fit, reducing cross-threading risks
• Consistent hardness performance at Rockwell C25, maintaining structural integrity under vibration
• Full-threaded design ensuring maximum grip length across the entire 2 1/4" shaft
• Regulatory compliance with RoHS 3 and REACH, meeting global environmental standards

Professional Applications & Engineering Value

This Grade 5 steel hex head screw delivers critical reliability in heavy-duty industrial applications where vibration resistance and tensile strength are paramount. The UNC coarse thread design enables faster installation in structural steel, machinery frames, and automotive assemblies, while the zinc plating provides a sacrificial layer against oxidation in humid or outdoor settings. Engineered to ASME B18.2.1 specifications, it ensures interchangeability and consistent performance in high-torque fastening systems, reducing assembly errors and maintenance downtime. The fully threaded shank distributes clamping force evenly, preventing joint loosening in dynamic load conditions.

Specification Summary & Compliance

Manufactured to ASME B18.2.1 and SAE J429 Grade 5 standards, this screw maintains Class 2A thread tolerances for precise fit. The 5/16"-18 UNC coarse thread with right-hand direction adheres to standardized dimensions, while the zinc-plated finish meets corrosion protection requirements. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material traceability.