S-91831A030 5/16"-18 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through the nylon insert, ensuring secure fastening in high-motion applications
• Excellent corrosion resistance with 18-8 stainless steel construction, ideal for harsh or outdoor environments
• Reliable performance up to 220°F, maintaining locking integrity in moderate heat conditions
• Easy installation and removal with standard external hex drive, compatible with common tools
• Precise UNC coarse thread engagement with Class 2B fit for consistent, reliable threading
• Compliance with RoHS 3 and REACH standards, ensuring environmental and safety regulations are met
• Durable, reusable design for long service life in industrial and mechanical assemblies

Professional Applications & Engineering Value

This 5/16"-18 nylon insert locknut delivers critical vibration resistance in demanding industrial settings, preventing loosening under dynamic loads. Crafted from 18-8 stainless steel, it offers inherent corrosion resistance, reducing maintenance in humid or chemical-exposed environments. The UNC coarse thread and Class 2B fit provide reliable, easy assembly with standard bolts, minimizing cross-threading risks. With an external hex drive, it ensures straightforward installation using common wrenches, while the nylon insert maintains locking force up to 220°F. Ideal for machinery, automotive, and structural applications, this locknut enhances assembly integrity and longevity, supporting robust, fail-safe fastening solutions.

Specification Summary & Compliance

This locknut features a 5/16"-18 UNC coarse thread with Class 2B thread fit for precise dimensional accuracy and consistent performance. Manufactured to industry standards, it includes a right-hand thread direction and standard hex profile. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for industrial use.