S-91837A030 5/16"-18 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through top lock distorted thread design that maintains secure fastening in high-vibration environments
• Enhanced corrosion protection with zinc-plated steel construction for extended service life in demanding industrial conditions
• Reliable thread engagement with Class 2B thread fit ensuring consistent performance and easy installation
• Heavy-duty performance meeting Grade 2 strength requirements for robust industrial applications
• Industry-standard compatibility with 5/16"-18 UNC coarse threads for seamless integration with existing equipment
• Secure external hex drive providing excellent torque transmission and tool accessibility
• Environmental compliance with REACH and RoHS 3 standards for safe, regulated use across industries

Professional Applications & Engineering Value

This Grade 2 locknut delivers exceptional engineering value through its distorted thread locking mechanism that actively resists loosening under continuous vibration and dynamic loads. The zinc-plated steel construction provides critical corrosion resistance while maintaining the mechanical strength required for heavy-duty industrial applications. Engineered with UNC coarse threads and Class 2B thread fit, these locknuts ensure reliable performance in machinery, automotive assemblies, and construction equipment where vibration-induced failure is a primary concern. The external hex drive style allows for efficient installation and removal using standard tools, making them ideal for maintenance-intensive environments while the top lock distorted thread design creates consistent locking force without requiring additional locking components.

Specification Summary & Compliance

This 5/16"-18 UNC locknut features Class 2B thread fit tolerances with right-hand coarse threads and standard hex profile measuring 1/2" across flats with 17/64" height. Manufactured to meet Grade 2 strength classification requirements and compliant with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental standards. The top lock distorted thread design follows industry-standard locking principles for reliable performance in vibration-prone applications.