S-94191A120 1/2"-20 Fed. Spec. FF-N-836, MS51968-15 Hex Nuts

Key Features & Benefits at a Glance

• Exceptional strength and reliability with Grade 8 classification, ensuring secure fastening in high-stress industrial environments
• Superior corrosion resistance provided by the black-oxide steel finish, extending service life in demanding conditions
• Precise fine threading (1/2"-20 UNF) with Class 2B fit for smooth assembly and reduced risk of cross-threading
• Compliance with rigorous standards including Fed. Spec. FF-N-836 and MS51968-15, guaranteeing consistent quality and performance
• Environmental responsibility through RoHS 3 and REACH compliance, meeting modern regulatory requirements
• Optimized dimensions (3/4" width, 7/16" height) with standard hex profile for easy installation using common tools
• Right-hand thread direction with external hex drive for straightforward, conventional tightening operations

Professional Applications & Engineering Value

This Grade 8 black-oxide steel hex nut delivers critical performance in heavy-duty applications where vibration resistance and long-term integrity are paramount. The UNF fine threading (1/2"-20) provides increased tensile strength and better load distribution compared to coarse threads, making it ideal for precision machinery, automotive assemblies, and structural frameworks. The black-oxide coating acts as a durable barrier against oxidation and mild chemical exposure, significantly reducing maintenance needs in industrial environments. Engineered with Class 2B thread fit, it ensures reliable engagement with mating components while accommodating minor misalignments during installation. This combination of high-strength material and corrosion-resistant finish addresses common failure points in demanding applications, providing engineers with a trustworthy fastening solution that maintains clamping force under extreme conditions.

Specification Summary & Compliance

This hex nut features 1/2"-20 UNF fine threading with Class 2B thread fit per unified screw thread standards. Manufacturing complies with Fed. Spec. FF-N-836 and MS51968-15 specifications, ensuring dimensional accuracy and performance consistency. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant (including 224 SVHCs as of 06/10/2022), meeting current environmental safety regulations for industrial components.