S-91813A120 4-40 MS35649-242, Fed. Spec. FF-N-836 Hex Nuts
Hex Nuts
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Basic Information
Dimension Parameters
Thread Parameters
Head Parameters
Material & Strength Parameters
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Key Features & Benefits at a Glance
- Superior corrosion resistance thanks to cadmium yellow-chromate plating, extending service life in harsh environments
- Reliable thread engagement with Class 2B thread fit ensuring secure fastening and vibration resistance
- Industry-standard compliance meeting MS35649-242 and Fed. Spec. FF-N-836 for guaranteed quality and interchangeability
- Easy installation and removal with standard external hex drive design using common tools
- Optimized for coarse UNC threads providing faster assembly and reduced cross-threading risk in industrial applications
- Robust steel construction delivering high tensile strength for demanding aerospace and military applications
- Precise dimensional accuracy with 1/4" width and 3/32" height ensuring perfect fit in assembly systems
Professional Applications & Engineering Value
This 4-40 UNC coarse thread hex nut delivers exceptional performance in critical applications where failure is not an option. The cadmium yellow-chromate plated steel construction provides superior protection against corrosion and chemical exposure, making it ideal for aerospace components, military equipment, and heavy machinery operating in demanding environments. The Class 2B thread fit ensures consistent clamping force and vibration resistance, preventing loosening under dynamic loads. Engineered to meet MS35649-242 and Fed. Spec. FF-N-836 standards, this external hex nut offers reliable fastening solutions for maintenance, repair, and original equipment manufacturing where precision and durability are paramount.
Specification Summary & Compliance
This hex nut features 4-40 UNC coarse threads with Class 2B thread fit tolerance, ensuring precise mating with corresponding male threads. The standard profile measures 1/4" across flats and 3/32" in height for consistent dimensional accuracy. Manufactured in compliance with MS35649-242 and Federal Specification FF-N-836, this right-hand thread nut meets rigorous industrial and military standards for quality assurance and performance reliability in critical fastening applications.
