S-95856A255 5/16"-18 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through nylon insert locking technology, preventing loosening in high-motion applications
• Lightweight durability with 6061 aluminum construction, reducing component weight while maintaining structural integrity
• Reliable high-temperature performance with nylon insert rated for continuous service up to 220°F (104°C)
• Precise thread engagement with UNC coarse threads and Class 2B fit ensuring smooth installation and secure fastening
• Industry-standard compatibility with standard 1/2" hex profile for easy installation using common wrench tools
• Environmental compliance meeting RoHS 3 and REACH regulations for use in regulated industrial environments
• Right-hand threading following conventional installation direction for intuitive assembly procedures

Professional Applications & Engineering Value

This 5/16"-18 nylon insert lock nut delivers critical vibration-resistant performance in demanding industrial environments where 6061 aluminum construction provides the ideal balance of strength and weight reduction. The nylon insert locking mechanism creates consistent friction against mating threads, effectively resisting rotational loosening caused by machinery vibrations, thermal cycling, and dynamic loads. Engineered with UNC coarse threads and Class 2B thread fit, this fastener ensures reliable engagement across multiple installation cycles while maintaining dimensional stability. The external hex drive style accommodates standard wrenching tools for efficient installation in confined spaces, making it particularly valuable for assembly lines, automotive components, electronic enclosures, and transportation equipment where weight savings and vibration management are paramount.

Specification Summary & Compliance

This locknut features 5/16"-18 UNC coarse threads with Class 2B thread fit per ASME standards, ensuring proper clearance and engagement with Class 2A external threads. The standard hex profile measures 1/2" across flats with 11/32" height for consistent tool engagement. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming absence of restricted substances. The nylon insert maintains locking effectiveness within the specified temperature range up to 220°F, making it suitable for various industrial applications requiring reliable vibration resistance.