S-90013A113 5/16"-18 Tamper Resistant Nuts

Key Features & Benefits at a Glance

• Enhanced Security Design – Tamper-resistant construction prevents unauthorized removal, protecting your equipment from interference in public or high-risk environments.
• High-Strength Zinc Alloy Build – Offers excellent corrosion resistance and durability, ensuring long-term performance in demanding industrial settings.
• Reliable 110 in-lbs Breaking Torque – Withstands significant mechanical stress, providing secure fastening that resists loosening under vibration or load.
• Coarse UNC Thread & Class 2B Fit – Ensures easy, quick installation and reliable engagement with mating components, reducing assembly time and errors.
• External Hex Drive Compatibility – Allows for straightforward installation using standard tools, while maintaining tamper-proof characteristics after securing.
• RoHS 3 & REACH Compliance – Meets stringent environmental and safety regulations, making it suitable for global supply chains and sensitive applications.
• Optimized 5/8" Width & 1/2" Height – Provides a balanced profile for secure fit in confined spaces without compromising on strength or accessibility.

Professional Applications & Engineering Value

This 5/16"-18 UNC tamper resistant nut is engineered to address critical security and reliability challenges in industrial and public infrastructure. The zinc alloy material delivers superior resistance to rust and environmental wear, ideal for outdoor equipment, machinery, and access panels exposed to harsh conditions. Its coarse thread design and Class 2B thread fit ensure consistent performance with standard bolts, minimizing cross-threading risks during high-volume assembly. With an external hex drive, installation is efficient using common tools, yet the nut remains tamper-proof once fastened—preventing vandalism or unauthorized adjustments in transportation, utilities, and manufacturing systems. By integrating 110 in-lbs breaking torque capability, it sustains integrity under dynamic loads, reducing maintenance needs and enhancing operational safety.

Specification Summary & Compliance

This nut adheres to UNC coarse thread standards with a Class 2B thread fit for consistent dimensional accuracy and reliable mating. Manufactured to meet ASME/ANSI specifications for inch-system fasteners, it ensures interoperability with standard components. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances for safe use in industrial and international markets.