S-97135A220 5/16"-18 Locknuts

Key Features & Benefits at a Glance

• Vibration-resistant locking with nylon insert that maintains secure fastening in high-vibration environments
• Heavy-duty performance with Grade 8 strength classification for demanding industrial applications
• Corrosion protection through zinc yellow-chromate plating that extends service life in harsh conditions
• High-temperature capability with nylon insert rated for continuous operation up to 220°F
• Precision threading with UNC coarse threads and Class 2B fit ensuring reliable engagement and easy assembly
• Easy installation using standard external hex drive compatible with common wrench tools
• Standardized dimensions with 1/2" width and 11/32" height for interchangeability across equipment

Professional Applications & Engineering Value

This Grade 8 nylon insert lock nut delivers exceptional vibration resistance for critical industrial assemblies where loosening could compromise safety or performance. The zinc yellow-chromate plated steel construction provides superior corrosion protection in manufacturing environments exposed to moisture, chemicals, or outdoor elements. Engineered with UNC coarse threads and Class 2B thread fit, this heavy-duty fastener ensures precise engagement while accommodating minor misalignments during installation. The nylon insert locking mechanism creates consistent friction against the mating bolt, maintaining clamp force even under continuous vibration in machinery, automotive systems, and structural applications. With temperature resistance up to 220°F, this locknut performs reliably in engine compartments, industrial equipment, and other thermally challenging environments where traditional fasteners might fail.

Specification Summary & Compliance

This locknut features 5/16"-18 UNC coarse threads with Class 2B thread fit per ASME standards, ensuring dimensional accuracy and interchangeability. The external hex drive (1/2" width) and standard hex nut profile comply with industrial fastener specifications. Manufactured from high-strength steel with zinc yellow-chromate plating for corrosion resistance, this component meets industry requirements for heavy-duty applications. The product conforms to relevant industrial standards for Grade 8 strength classification and is suitable for use in various industrial and manufacturing environments.