S-90640A165 9/16"-18 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through nylon insert locking technology, preventing loosening in high-motion applications
• Reusable locking performance allows for multiple installations without compromising secure fastening
• Enhanced corrosion protection with zinc-plated steel construction for extended service life in demanding environments
• High-temperature capability with nylon insert rated to 220°F (104°C) for thermal cycling applications
• Precision fine threading with Class 2B fit ensures smooth engagement and reliable torque performance
• Standard external hex drive provides compatibility with common wrenching tools for easy installation
• Regulatory compliance meets RoHS 3 and REACH standards for global industrial applications

Professional Applications & Engineering Value

This 9/16"-18 UNF nylon insert locknut delivers critical vibration resistance where conventional fasteners fail. The zinc-plated steel construction provides durable corrosion protection while the nylon insert creates consistent friction locking that maintains integrity through thermal cycles up to 220°F. Engineered with Class 2B fine threads, this external hex locknut ensures precise fitment in automotive, machinery, and equipment assembly applications where vibration-induced loosening compromises safety and performance. The reusable design offers cost efficiency through multiple service cycles without replacement.

Specification Summary & Compliance

Manufactured to UNF fine thread standards with Class 2B thread fit for consistent engagement. Dimensions include 7/8" width and 41/64" height with right-hand threading. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility while meeting industrial fastener specifications for reliable, repeatable performance.