S-90630A165 5/8"-18 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through durable nylon insert locking that maintains secure fastening in high-stress environments
• Exceptional strength and durability with Grade 8 steel construction, capable of withstanding heavy loads and extreme conditions
• Precision thread engagement with Class 2B fit and 5/8"-18 UNF fine threads ensuring reliable, consistent performance
• High-temperature capability with nylon insert rated for temperatures up to 220°F (104°C) without compromising locking performance
• Easy installation and removal with standard external hex drive design compatible with common wrenching tools
• Environmental compliance assurance meeting both REACH and RoHS 3 standards for safe industrial use
• Optimized dimensional stability with 15/16" width and 3/4" height providing consistent performance across applications

Professional Applications & Engineering Value

This Grade 8 steel nylon insert locknut delivers critical vibration resistance in demanding industrial applications where secure fastening is paramount. The 5/8"-18 UNF fine threads with Class 2B fit provide exceptional thread engagement and load distribution, preventing loosening under dynamic loads. The nylon insert locking technology creates consistent friction that maintains clamp load without damaging mating threads, making it ideal for machinery, automotive assemblies, and heavy equipment subjected to continuous vibration. With temperature resistance up to 220°F, this external hex locknut ensures reliable performance in elevated temperature environments while the standard hex profile allows for straightforward installation and maintenance access in confined spaces.

Specification Summary & Compliance

This heavy-duty locknut features precision 5/8"-18 UNF fine threads with Class 2B thread fit for optimal engagement and consistent performance. Manufactured from high-strength Grade 8 steel with standard external hex drive (15/16" width, 3/4" height) and right-hand thread orientation. The locking mechanism utilizes a durable nylon insert rated for temperatures up to 220°F. Compliant with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental standards, ensuring safe use across various industrial applications.