S-98694A115 5/16"-18 Square Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding environments
• High-strength performance from Grade 5 classification, ensuring reliable load-bearing capacity for heavy-duty applications
• Easy manual installation and removal with external square drive design, facilitating efficient assembly without specialized tools
• Secure and consistent thread engagement with Class 2B fit UNC coarse threads, reducing cross-threading risks
• Wrenching stability provided by the 9/16" square width, preventing slippage during high-torque tightening
• Compliance with global environmental standards including RoHS 3 and REACH, ensuring safe use in regulated industries
• Optimized for right-hand thread systems with 5/16"-18 coarse spacing, delivering robust performance in standard inch-based assemblies

Professional Applications & Engineering Value

This Grade 5 square nut delivers critical engineering value in industrial settings where vibration resistance and structural integrity are paramount. The zinc-plated steel material provides a protective barrier against rust and chemical exposure, making it ideal for outdoor equipment, machinery frames, and automotive assemblies. Its UNC coarse threads and Class 2B thread fit ensure rapid installation and reliable performance in high-vibration environments, reducing maintenance downtime. The external square drive allows for secure wrenching in confined spaces, while the right-hand thread direction aligns with standard assembly practices. These features collectively address common challenges like fastener loosening, corrosion-induced failure, and installation inefficiency in heavy-duty industrial applications.

Specification Summary & Compliance

This square nut maintains precision with Class 2B thread fit per UNC standards, ensuring consistent engagement and dimensional accuracy. Manufactured from zinc-plated steel with a width of 9/16" and height of 17/64", it conforms to Grade 5 strength requirements for high-stress applications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting stringent environmental and safety standards for industrial use.