S-90630A115 5/16"-18 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through nylon insert technology that maintains locking force even under continuous stress
• Heavy-duty performance with Grade 8 steel construction providing exceptional strength for demanding industrial applications
• Reliable high-temperature operation with nylon insert maintaining locking properties up to 220°F (104°C)
• Precise thread engagement with Class 2B fit ensuring consistent, reliable fastening across multiple installations
• Industry-standard compatibility with UNC coarse threads and 5/16"-18 size for broad application across equipment and machinery
• Easy installation and removal with standard external hex drive design compatible with common wrench tools
• Environmental compliance assurance meeting both REACH and RoHS 3 standards for safe, regulated industrial use

Professional Applications & Engineering Value

This Grade 8 steel nylon insert lock nut delivers critical vibration-resistant fastening solutions for industrial machinery, automotive assemblies, and heavy equipment where secure locking performance is non-negotiable. The nylon insert locking mechanism creates consistent friction against mating threads, effectively preventing loosening from vibration and thermal cycling while allowing for reusable installations. Engineered with UNC coarse threads and Class 2B thread fit, this locknut ensures precise engagement with standard male threads commonly found in industrial fastening systems. The external hex drive design provides reliable torque application using standard tools, while the 220°F maximum temperature rating makes it suitable for environments experiencing moderate heat exposure. This combination of vibration resistance, high-strength material, and temperature stability addresses the critical need for dependable fastening in dynamic industrial applications.

Specification Summary & Compliance

This heavy-duty locknut features 5/16"-18 UNC coarse threads with Class 2B thread fit for precise dimensional accuracy and reliable engagement. Manufactured from Grade 8 steel for maximum strength requirements, the nut incorporates a nylon insert locking element and standard external hex drive configuration. The product is fully compliant with REACH (EC 1907/2006) regulations and RoHS 3 (2015/863/EU) directives, ensuring environmental responsibility and regulatory adherence for industrial and commercial applications.