S-90715A005 4-40 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through nylon insert locking mechanism that maintains secure fastening in high-motion applications
• Exceptional corrosion resistance with 316 stainless steel construction, ideal for harsh environments and chemical exposure
• Reliable high-temperature performance with nylon insert rated to 220°F for thermal stability in demanding conditions
• Easy installation and removal with standard external hex drive design and coarse UNC threading
• Precise thread engagement with Class 2B fit ensuring consistent performance and reduced cross-threading risk
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for global industrial applications
• Optimized dimensional profile with 1/4" width and 9/64" height for space-constrained assemblies

Professional Applications & Engineering Value

This 4-40 nylon insert locknut delivers critical vibration-resistant performance where fastener loosening poses operational risks. The 316 stainless steel construction provides superior corrosion resistance compared to standard grades, making it ideal for marine, chemical processing, and food industry applications where moisture and corrosive agents are present. The UNC coarse thread pattern ensures rapid installation while maintaining structural integrity, while the nylon insert creates consistent friction locking that outperforms mechanical locking methods in dynamic environments. Engineered for industrial durability, this external hex locknut withstands thermal cycling up to 220°F without compromising the nylon insert's locking capability, providing reliable fastening solutions for machinery, equipment manufacturing, and transportation applications where temperature fluctuations and vibration are constant challenges.

Specification Summary & Compliance

This locknut features Class 2B thread fit per UNC standards, ensuring precise dimensional accuracy and compatibility with mating components. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming adherence to environmental and safety standards. The right-hand threaded 4-40 coarse pattern with standard hex profile provides industry-standard installation compatibility, while the specified 1/4" width and 9/64" height maintain dimensional consistency across production batches for reliable assembly integration.