S-97135A210 1/4"-20 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through nylon insert locking technology that maintains secure fastening under dynamic loads
• Exceptional durability with Grade 8 strength classification, providing high tensile strength for demanding industrial applications
• Corrosion protection from zinc yellow-chromate plating that extends service life in harsh environments
• Reusable locking capability allowing multiple installations without compromising vibration resistance performance
• High-temperature performance with nylon insert rated to 220°F (104°C) for thermal cycling applications
• Precise thread engagement with Class 2B thread fit ensuring consistent, reliable installation
• Standard external hex drive for compatibility with common tools and efficient installation/torque application

Professional Applications & Engineering Value

This Grade 8 nylon insert lock nut delivers critical vibration resistance for machinery, automotive, and heavy equipment applications where loosening under dynamic loads poses significant safety and performance risks. The zinc yellow-chromate plated steel construction provides dual protection against corrosion and wear, while the nylon insert locking mechanism creates consistent friction that maintains clamp force without damaging mating threads. Engineered with UNC coarse threads and Class 2B thread fit, this locknut ensures reliable engagement in high-vibration environments such as engine components, conveyor systems, and structural assemblies. The 220°F temperature rating makes it suitable for applications experiencing thermal cycling, while the reusable design reduces maintenance costs and downtime.

Specification Summary & Compliance

This locknut features 1/4"-20 UNC coarse threads with Class 2B thread fit precision manufactured to ASME/ANSI standards. The external hex drive (7/16" width) provides standard tool compatibility, while the 5/16" height offers optimal profile for space-constrained applications. Manufactured from high-strength steel with zinc yellow-chromate plating for corrosion resistance, this fastener meets industry standards for heavy-duty applications and complies with relevant industrial specifications for Grade 8 strength classification.