S-91240A005 4-40 Fed. Spec. FF-N-836, MS35649-244, Fed. Spec. QQ-P-35 Hex Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ensuring longevity in harsh industrial environments
• Reliable thread engagement through Class 2B thread fit, providing consistent clamping force and vibration resistance
• Wide compatibility with UNC coarse threading, enabling quick assembly and disassembly in various applications
• Standard external hex drive design for easy installation using common wrench tools, reducing assembly time
• Compliance with multiple federal specifications including Fed. Spec. FF-N-836 and MS35649-244, guaranteeing quality and interchangeability
• Environmental regulation adherence with RoHS 3 and REACH compliance, ensuring safe use in regulated industries
• Durable standard profile offering excellent torque transmission and mechanical strength for heavy-duty fastening needs

Professional Applications & Engineering Value

These 4-40 UNC hex nuts deliver exceptional performance in demanding industrial settings where corrosion resistance and thread reliability are critical. The 18-8 stainless steel composition provides excellent protection against rust and chemical exposure, making these coarse thread hex nuts ideal for machinery, equipment manufacturing, and outdoor applications. The Class 2B thread fit ensures precise mating with corresponding male threads, minimizing the risk of cross-threading while maintaining consistent clamping force under vibration. With external hex drive compatibility, installation becomes efficient using standard tools, reducing labor costs in assembly lines. These nuts meet rigorous Fed. Spec. FF-N-836 and MS35649-244 standards, providing engineers with reliable components for structural assemblies, automotive systems, and industrial maintenance where right-hand thread configurations are required.

Specification Summary & Compliance

This 4-40 UNC hex nut features Class 2B thread fit per Unified Thread Standard specifications, ensuring dimensional accuracy and proper clearance with mating components. The manufacturing process adheres to Fed. Spec. FF-N-836, MS35649-244, and QQ-P-35 standards for material and performance requirements. Environmental compliance is maintained through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications, confirming the absence of restricted substances. With 1/4" width and 3/32" height dimensions in the inch measurement system, these nuts provide standardized compatibility across industrial applications requiring coarse thread fastening solutions.