S-90040A031 3/8"-16 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through center lock distorted thread technology that maintains secure fastening in high-motion environments
• Enhanced corrosion protection with zinc-plated steel construction for extended service life in industrial conditions
• Reliable thread engagement with Class 2B thread fit ensuring consistent performance and easy installation
• High-strength performance meeting Grade 2 specifications for demanding mechanical applications
• Industry-standard compatibility with 3/8"-16 UNC coarse threads for broad equipment compatibility
• Secure locking mechanism featuring distorted thread design that eliminates the need for additional locking components
• External hex drive for straightforward installation using standard wrenching tools

Professional Applications & Engineering Value

This 3/8"-16 UNC locknut with center lock distorted thread technology addresses critical vibration-induced loosening challenges in industrial machinery, automotive assemblies, and heavy equipment. The zinc-plated steel construction provides essential corrosion resistance while maintaining Grade 2 strength requirements. The distorted thread locking type creates consistent interference along the mating threads, delivering reliable vibration resistance without compromising Class 2B thread fit installation characteristics. Engineered for right-hand thread applications where rotational forces and mechanical stress are prevalent, this external hex locknut offers maintenance-free performance in demanding environments from manufacturing equipment to transportation systems.

Specification Summary & Compliance

This locknut features precise 3/8"-16 UNC coarse thread with Class 2B thread fit tolerance for consistent engagement. The manufacturing complies with industry standards for distorted thread locknuts and meets Grade 2 strength classification. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant (07/08/2021, 219 SVHC), ensuring environmental and safety standards for industrial applications. Dimensions include 9/16" width and 21/64" height for standardized installation requirements.