S-90040A137 1/2"-13 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through center lock distorted thread technology that maintains secure fastening under dynamic loads
• Enhanced corrosion protection with zinc-plated steel construction for extended service life in harsh industrial environments
• Reliable coarse thread performance with UNC 1/2"-13 threading that provides quick installation and strong holding power
• Consistent thread engagement with Class 2B thread fit ensuring proper mating with male threaded components
• Easy installation and removal using standard wrench tools thanks to the external hex drive design
• Environmental compliance assurance meeting both REACH and RoHS 3 standards for safe industrial use
• Durable Grade 2 strength rating delivering reliable performance for medium-duty applications

Professional Applications & Engineering Value

This zinc-plated steel locknut with center lock distorted thread technology addresses critical vibration-induced loosening challenges in industrial equipment, machinery, and structural assemblies. The UNC coarse thread design ensures rapid installation while maintaining secure fastening in high-vibration environments where standard nuts typically fail. The external hex drive profile allows for straightforward installation using common tools, reducing assembly time and labor costs. Engineered with distorted thread locking mechanism, these locknuts provide consistent clamping force without requiring additional locking components, making them ideal for automotive, manufacturing, and construction applications where reliability is paramount. The combination of Grade 2 strength classification and zinc-plated corrosion resistance ensures long-term performance in demanding conditions.

Specification Summary & Compliance

This 1/2"-13 UNC locknut features precise Class 2B thread fit tolerances and standard external hex drive configuration with dimensions of 3/4" width and 7/16" height. Manufactured to industry standards with right-hand thread direction and coarse thread spacing. The product is fully compliant with REACH (EC 1907/2006) regulations and RoHS 3 (2015/863/EU) directives, ensuring environmental safety and regulatory adherence for industrial applications.