S-90099A035 5/8"-11 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through the nylon insert locking mechanism that maintains secure fastening under dynamic loads
• Excellent corrosion resistance provided by 18-8 stainless steel construction for long-term reliability in harsh environments
• Enhanced torque application with the extra wide hex profile that prevents tool slippage and enables higher tightening forces
• High-temperature capability with nylon insert rated up to 250°F (121°C) for demanding industrial applications
• Reliable thread engagement ensured by Class 2B thread fit with UNC coarse threads for quick assembly and disassembly
• Environmental compliance meeting RoHS 3 and REACH standards for safe use across regulated industries
• Right-hand threading design for standard installation procedures and compatibility with common equipment

Professional Applications & Engineering Value

This heavy-duty nylon insert lock nut delivers critical vibration resistance in demanding applications where loosening under dynamic loads poses significant safety and performance risks. The 18-8 stainless steel construction provides exceptional corrosion resistance, making it ideal for marine, chemical processing, and outdoor equipment where environmental factors degrade ordinary fasteners. The extra wide hex profile enables superior torque transmission, preventing rounding during installation while accommodating higher clamping forces in structural assemblies, machinery, and transportation equipment. With its UNC coarse threads and Class 2B thread fit, this lock nut ensures reliable engagement while resisting cross-threading during high-volume assembly operations. The nylon insert maintains consistent locking performance across temperature variations up to 250°F, providing dependable service in automotive, industrial machinery, and construction applications where thermal cycling occurs.

Specification Summary & Compliance

This lock nut features 5/8"-11 UNC coarse threads with Class 2B thread fit for precise engagement and reliable performance. The dimensional specifications include a 1 1/16" width across flats and 55/64" height for the extra wide hex profile. Manufactured from 18-8 stainless steel with a nylon insert locking mechanism rated for temperatures up to 250°F. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance for industrial applications worldwide.