S-91834A102 4-40 Fed. Spec. FF-N-836, NAS671C4 Hex Nuts
Hex Nuts
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Basic Information
Dimension Parameters
Thread Parameters
Head Parameters
Material & Strength Parameters
Finish & Compliance Parameters
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Key Features & Benefits at a Glance
- Superior corrosion resistance from 18-8 stainless steel construction, ideal for harsh industrial environments.
- Precise Class 3B thread fit ensures reliable, vibration-resistant connections in critical assemblies.
- Narrow profile design allows installation in tight spaces while maintaining full wrench engagement.
- Compliance with FF-N-836 and NAS671C4 specifications guarantees consistent quality for aerospace and defense applications.
- Coarse UNC threading provides faster assembly and reduced cross-threading risk compared to fine threads.
- RoHS 3 and REACH compliance meets international environmental standards for safe usage.
- External hex drive style offers familiar, tool-friendly installation with standard wrenches.
Professional Applications & Engineering Value
Engineered for demanding applications where corrosion resistance and thread precision are paramount, these 4-40 UNC coarse thread hex nuts solve common industrial fastening challenges. The 18-8 stainless steel material provides excellent durability against moisture, chemicals, and temperature variations, making them ideal for aerospace components, electronic enclosures, and marine equipment. The narrow hex nut profile enables installation in confined spaces without compromising torque capability, while the Class 3B thread fit ensures minimal backlash and secure fastening in high-vibration environments. Meeting FF-N-836 and NAS671C4 standards, these nuts deliver consistent performance for OEM and MRO requirements across defense, transportation, and precision manufacturing sectors.
Specification Summary & Compliance
This 4-40 UNC coarse thread hex nut features a right-hand thread direction with Class 3B thread fit per unified inch standards, ensuring tight tolerances for precision assemblies. Manufacturing complies with Fed. Spec. FF-N-836 and NAS671C4 specifications for dimensional accuracy and performance. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting current environmental regulations for hazardous substance restrictions.
