S-98789A120 5/16"-18 Tamper Resistant Nuts

Key Features & Benefits at a Glance

• Enhanced tamper resistance prevents unauthorized removal in high-security environments
• Superior corrosion protection through zinc yellow-chromate plating extends service life in harsh conditions
• Reliable coarse thread engagement with UNC 5/16"-18 specification ensures quick installation and vibration resistance
• Precision Class 2B thread fit guarantees consistent performance and secure fastening
• External square drive compatibility allows for standard tooling while maintaining security features
• Right-hand thread design provides intuitive installation following conventional practices
• Comprehensive regulatory compliance with RoHS 3 and REACH standards meets global industrial safety requirements

Professional Applications & Engineering Value

This 5/16"-18 UNC tamper resistant nut delivers critical security where vandalism or unauthorized access poses operational risks. The zinc yellow-chromate plated steel construction provides dual protection against corrosion and tampering, making it ideal for public infrastructure, electrical enclosures, and industrial machinery. The coarse thread spacing combined with Class 2B thread fit ensures rapid installation while maintaining vibration resistance in high-stress applications. The external square drive design maintains compatibility with standard tools while the tamper-resistant feature requires specialized removal equipment, creating an optimal balance between installation efficiency and security performance for permanent or semi-permanent fastening solutions.

Specification Summary & Compliance

Manufactured to precise dimensional standards with 1 3/64" width and 15/64" height, this security nut maintains Class 2B thread fit tolerances per UNC specifications. The right-hand coarse thread (5/16"-18 UNC) ensures compatibility with standard mating components. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms adherence to international environmental and safety standards for industrial fastener applications.