S-97190A025 1/2"-13 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through cotter pin locking mechanism that prevents loosening under extreme dynamic loads
• Enhanced corrosion protection with zinc-plated steel construction for extended service life in harsh environments
• High-strength performance meeting Grade 5 specifications, ensuring reliable fastening in demanding industrial applications
• Quick installation and removal with standard external hex drive design compatible with common wrench tools
• Secure mechanical locking via 7/64" cotter pin slot that provides positive retention without compromising thread integrity
• Precision thread engagement with Class 2B UNC coarse threads ensuring consistent fit and reduced cross-threading risk
• Regulatory compliance assurance meeting both REACH and RoHS 3 environmental standards for workplace safety

Professional Applications & Engineering Value

This Grade 5 castle locknut delivers critical engineering solutions for applications where vibration-induced loosening poses significant safety risks. The zinc-plated steel construction provides essential corrosion resistance in industrial environments exposed to moisture and chemicals, while the 1/2"-13 UNC coarse threads with Class 2B fit ensure reliable engagement even in high-vibration scenarios. The integrated cotter pin locking mechanism offers permanent mechanical security without relying on nylon inserts that can degrade over time. Engineered for heavy machinery, automotive suspensions, agricultural equipment, and construction applications, this external hex drive locknut maintains clamping force integrity through the most demanding operating conditions, preventing catastrophic fastener failure and reducing maintenance frequency.

Specification Summary & Compliance

This industrial locknut features precision 1/2"-13 UNC coarse threads with Class 2B fit tolerance for optimal thread engagement. The external hex drive design accommodates standard 3/4" wrench tools, while the 7/16" height profile provides optimal strength-to-weight ratio. Manufactured from Grade 5 steel with zinc plating for corrosion protection, the nut includes a 7/64" cotter pin slot with minimum slot depth of 0.137" and width of 0.15" for secure locking. The product is fully compliant with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental regulations, ensuring safe use across various industrial sectors.