S-97190A140 1/2"-20 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through cotter pin locking mechanism that prevents loosening in high-stress applications
• Enhanced corrosion protection with zinc-plated steel construction for extended service life in harsh environments
• High-strength performance with Grade 5 classification ensuring reliable load-bearing capacity
• Precise thread engagement with Class 2B UNF fine threads providing secure, vibration-resistant connections
• Optimal torque application through external hex drive design for easy installation with standard tools
• Secure locking capability with 7/64" cotter pin diameter and properly sized slots for reliable retention
• Environmental compliance meeting both REACH and RoHS 3 standards for safe industrial use

Professional Applications & Engineering Value

This Grade 5 castle locknut with 1/2"-20 UNF fine threads addresses critical safety concerns in high-vibration environments where fastener failure could lead to catastrophic results. The zinc-plated steel construction provides essential corrosion resistance while maintaining the mechanical strength required for heavy-duty applications. The cotter pin locking mechanism offers a positive mechanical lock that surpasses friction-based alternatives, making it ideal for automotive, agricultural equipment, machinery, and structural applications subject to constant vibration and dynamic loads. The external hex drive ensures maximum torque application during installation, while the Class 2B thread fit guarantees consistent engagement with mating components for reliable performance in demanding industrial settings.

Specification Summary & Compliance

This castle locknut features precise 1/2"-20 UNF fine threads with Class 2B fit for optimal engagement, measuring 3/4" across flats and 7/16" in height. The nut accommodates standard 7/64" cotter pins with minimum slot dimensions of 0.137" depth and 0.15" width. Manufactured from Grade 5 steel with zinc plating for corrosion protection, this fastener complies with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental standards, ensuring safe use across various industrial applications while meeting rigorous quality and performance requirements.