S-90636A116 5/8"-11 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through center lock distorted thread design, preventing loosening in high-stress environments
• Exceptional strength and durability with Grade 8 steel construction, suitable for heavy-duty industrial applications
• Enhanced corrosion protection from black-oxide surface treatment, extending service life in demanding conditions
• Reliable coarse thread engagement with 5/8"-11 UNC specification, ensuring quick installation and secure fastening
• Precision thread fit meeting Class 2B standards, providing consistent performance and compatibility
• Easy installation and removal with standard 15/16" external hex drive, compatible with common tools
• Compliance with environmental standards including REACH and RoHS 3, ensuring workplace safety and regulatory adherence

Professional Applications & Engineering Value

This Grade 8 black-oxide steel locknut with center lock distorted thread technology addresses critical vibration-induced loosening challenges in industrial settings. The innovative distorted thread design creates consistent interference along the mating bolt threads, maintaining clamping force under extreme dynamic loads. Engineered with 5/8"-11 UNC coarse threads, it delivers rapid assembly in heavy machinery, construction equipment, and transportation systems where vibration resistance is paramount. The black-oxide coating provides essential corrosion protection while maintaining dimensional integrity, making it ideal for outdoor applications and harsh environments. This external hex locknut combines high-strength Grade 8 material with precision Class 2B thread fit, ensuring reliable performance in critical bolted connections that demand both strength and vibration security.

Specification Summary & Compliance

This locknut features 5/8"-11 UNC coarse threads with Class 2B thread fit for precise dimensional accuracy. The standard 15/16" hex profile and 35/64" height provide optimal wrench engagement and load distribution. Manufactured from Grade 8 steel with black-oxide surface treatment, the component meets industry standards for high-strength fasteners. Compliant with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental regulations, ensuring safe use in industrial applications worldwide.