S-90673A116 5/8"-18 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through distorted thread top lock technology that maintains secure fastening in high-motion environments
• Exceptional durability with Grade 5 steel construction providing reliable performance in demanding industrial applications
• Corrosion-resistant protection from black-oxide coating that extends service life in various operating conditions
• Precise fine thread engagement with 5/8"-18 UNF Class 2B threads ensuring consistent, reliable connections
• Easy installation and removal using standard 15/16" external hex drive compatible with common tools
• Regulatory compliance assurance meeting REACH and RoHS 3 standards for safe industrial use
• Right-hand thread design providing familiar installation for standard assembly procedures

Professional Applications & Engineering Value

This Grade 5 Black-Oxide Steel Locknut with distorted thread top lock technology addresses critical vibration-induced loosening challenges in industrial machinery, automotive assemblies, and heavy equipment. The 5/8"-18 UNF fine thread configuration combined with the top lock distortion creates permanent friction that resists rotational forces, eliminating the need for secondary locking devices. The black-oxide surface treatment provides corrosion protection while maintaining dimensional integrity, making these external hex locknuts ideal for applications where maintenance access is limited. Engineered for Class 2B thread fit, these components deliver consistent clamping force in vibration-prone environments while meeting stringent industry compliance requirements.

Specification Summary & Compliance

This locknut features 5/8"-18 UNF fine threads with Class 2B thread fit tolerance, ensuring precise engagement with mating components. Manufactured from Grade 5 steel with black-oxide coating, the nut measures 15/16" across flats and 5/8" in height. The product fully complies with REACH (EC 1907/2006) regulations and RoHS 3 (2015/863/EU) directives, meeting current environmental and safety standards for industrial fasteners. The distorted thread top lock design follows industry-proven locking principles for reliable performance in demanding applications.