S-95170A350 4-40 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through integrated spring lock washer design that maintains clamping force under dynamic loads
• Enhanced corrosion protection with zinc plating that provides durable surface finish for harsh industrial environments
• Reliable thread engagement with Class 2B thread fit ensuring consistent performance and easy assembly
• Quick installation and removal using standard 1/4" external hex drive compatible with common wrench tools
• Optimal material strength from steel construction providing excellent load-bearing capacity for demanding applications
• Industry-standard compatibility with 4-40 UNC coarse threads for broad interoperability across equipment and components
• Regulatory compliance assurance meeting both REACH and RoHS 3 environmental standards for global industrial use

Professional Applications & Engineering Value

This zinc-plated steel locknut with integrated spring lock washer addresses critical vibration-induced loosening challenges in industrial machinery, automotive assemblies, and electrical enclosures. The 4-40 UNC coarse thread configuration combined with Class 2B thread fit delivers precise engagement while accommodating minor misalignments. The external hex drive enables high-torque installation using standard tools, making it ideal for maintenance-intensive environments. The steel construction with zinc plating provides corrosion resistance essential for outdoor equipment and manufacturing facilities where moisture and chemicals are present. This vibration-resistant locknut maintains joint integrity in applications subject to continuous motion or impact loads, reducing maintenance frequency and preventing equipment downtime.

Specification Summary & Compliance

This locknut features 4-40 UNC coarse threads with Class 2B thread fit for precision tolerance, measuring 1/4" across flats and 9/64" in height. The assembly includes a steel spring lock washer with 0.328" outer diameter. Manufacturing complies with industry standards for external hex drive locknuts and meets REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental compliance requirements for industrial fastener applications.