S-97135A255 1/2"-20 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through nylon insert locking mechanism that maintains secure fastening even under continuous motion
• Exceptional durability with Grade 8 strength classification, providing maximum load-bearing capacity for heavy-duty applications
• Enhanced corrosion protection from zinc yellow-chromate plating that withstands harsh industrial environments
• Reliable high-temperature performance with nylon insert rated for temperatures up to 220°F without compromising locking capability
• Precise thread engagement with Class 2B thread fit ensuring consistent, reliable fastening across multiple installations
• Easy installation and removal using standard external hex drive compatible with common industrial tools
• Optimal fine thread performance with 1/2"-20 UNF thread pattern providing superior holding power in critical applications

Professional Applications & Engineering Value

This Grade 8 nylon insert locknut delivers exceptional engineering value in applications where vibration-induced loosening poses significant operational risks. The zinc yellow-chromate plated steel construction provides superior corrosion resistance, making it ideal for automotive, machinery, and industrial equipment exposed to environmental challenges. The nylon insert locking mechanism creates consistent friction against mating threads, maintaining clamp force without damaging threads during repeated disassembly. With fine UNF threads and Class 2B thread fit, this locknut ensures precise engagement in high-stress applications where vibration resistance and reliable performance are critical. The combination of high-strength Grade 8 material and temperature-resistant nylon insert (up to 220°F) makes it suitable for engine components, heavy machinery, and industrial assemblies requiring dependable, long-term fastening solutions.

Specification Summary & Compliance

This locknut features 1/2"-20 UNF fine threads with Class 2B thread fit for precision engagement, manufactured to Grade 8 strength standards with standard hex profile measuring 3/4" width and 19/32" height. The product complies with industry standards for UNF thread specifications and features a right-hand thread direction with external hex drive style. The zinc yellow-chromate plating provides corrosion protection while meeting industrial requirements for durable surface finishes in demanding applications.