S-97135A275 5/8"-18 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through nylon insert locking mechanism that maintains secure fastening in high-motion environments
• Enhanced temperature performance with nylon insert rated for continuous service up to 220°F (104°C)
• Exceptional corrosion protection provided by zinc yellow-chromate plating for extended service life in harsh conditions
• Premium strength reliability from Grade 8 steel construction, ensuring consistent performance under heavy loads
• Precise thread engagement with Class 2B fine UNF threads for superior fit and reduced risk of cross-threading
• Easy installation and removal using standard external hex drive compatible with common wrench tools
• Optimized for fine-thread applications where vibration resistance and precise clamping force are critical

Professional Applications & Engineering Value

This Grade 8 heavy-duty nylon insert locknut delivers exceptional engineering value in demanding industrial applications where vibration-induced loosening poses significant safety and maintenance challenges. The nylon insert locking mechanism creates consistent friction against mating threads, maintaining clamp load without damaging threads or requiring additional locking devices. The zinc yellow-chromate plating provides superior corrosion resistance in environments exposed to moisture, chemicals, and temperature fluctuations. With its fine UNF threads and Class 2B thread fit, this locknut ensures precise engagement in critical assemblies such as heavy machinery, automotive systems, industrial equipment, and structural applications where reliability under dynamic loads is paramount. The 220°F temperature rating makes it suitable for engine compartments, hydraulic systems, and other high-temperature environments where conventional locking methods may fail.

Specification Summary & Compliance

This locknut features 5/8"-18 UNF fine threads with Class 2B thread fit for precise engagement and consistent performance. Manufactured to industry standards for external hex locknuts with standard profile (15/16" width, 3/4" height). The Grade 8 strength classification ensures high tensile strength and reliable performance in heavy-duty applications. Compliant with relevant industrial specifications for nylon insert locknuts and meets material and plating requirements for corrosion protection in demanding environments.