S-97135A403 1 1/4"-7 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through nylon insert locking technology that maintains secure fastening under dynamic loads
• Exceptional corrosion protection with zinc yellow-chromate plating that extends service life in harsh industrial environments
• High-temperature performance with nylon insert rated for continuous operation up to 220°F without compromising locking capability
• Heavy-duty strength rating meeting Grade 8 specifications for reliable performance in demanding applications
• Precise thread engagement with Class 2B thread fit ensuring smooth installation and consistent clamping force
• Easy installation and removal using standard wrench tools thanks to the external hex drive design
• Optimized for coarse threading with 1 1/4"-7 UNC threads providing quick assembly and reduced cross-threading risk

Professional Applications & Engineering Value

This Grade 8 nylon insert lock nut delivers critical vibration resistance where conventional fasteners fail. The zinc yellow-chromate plated steel construction provides dual protection against corrosion and wear, making it ideal for heavy machinery, automotive assemblies, and industrial equipment exposed to harsh conditions. The nylon insert locking mechanism creates consistent friction against bolt threads, preventing loosening from vibration and thermal cycling while allowing for reusable applications. With coarse UNC threading and external hex drive, installation efficiency is maximized in production environments where time and reliability are paramount. The combination of high-temperature capability and Class 2B thread precision ensures maintained performance in applications ranging from engine components to structural frameworks.

Specification Summary & Compliance

This locknut features 1 1/4"-7 UNC coarse threads with Class 2B thread fit tolerance for precise engagement. Manufactured to Grade 8 strength specifications with standard hex profile measuring 2 1/64" width and 1 41/64" height. The zinc yellow-chromate plating provides corrosion resistance while the nylon insert maintains locking capability up to 220°F maximum temperature. Complies with industry standards for right-hand thread direction and external hex drive compatibility with standard tooling.