S-90640A350 7/8"-14 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through durable nylon insert technology that maintains locking force under dynamic loads
• Enhanced corrosion protection with zinc-plated steel construction for extended service life in demanding environments
• Reliable high-temperature performance with nylon insert rated up to 220°F for thermal stability in industrial applications
• Precise thread engagement with Class 2B thread fit ensuring consistent torque values and secure fastening
• Easy installation and removal using standard external hex drive compatible with common wrenching tools
• Fine thread design (14 TPI) providing better tension control and resistance to loosening in critical assemblies
• Environmental compliance meeting RoHS 3 and REACH standards for safe use across global markets

Professional Applications & Engineering Value

This 7/8"-14 UNF nylon insert locknut delivers exceptional engineering value in applications where vibration-induced loosening poses significant reliability concerns. The zinc-plated steel construction provides essential corrosion resistance while maintaining the mechanical strength required for heavy-duty industrial equipment. The nylon insert locking mechanism creates consistent friction against mating threads, effectively damping vibrations in machinery, automotive systems, and structural assemblies. With its fine thread spacing and Class 2B thread fit, this locknut ensures precise alignment and uniform load distribution, preventing stress concentration that can lead to thread damage. The external hex drive style facilitates efficient installation in confined spaces using standard tools, reducing assembly time while maintaining the integrity of critical connections subject to thermal cycling and dynamic loads.

Specification Summary & Compliance

This locknut features 7/8"-14 UNF right-hand threads with Class 2B thread fit for consistent engagement and reliable performance. The dimensional specifications include a 1 1/4" width across flats and 63/64" height, conforming to standard hex nut profiles. Manufactured from zinc-plated steel with a nylon insert rated for temperatures up to 220°F, the product complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring regulatory compliance for industrial applications worldwide.