S-94575A240 5/16"-24 MS51968-5; Fed. Spec. FF-N-836 Hex Nuts

Hex Nuts

0866FA00004 Hex Nuts
0866FA00004 Hex Nuts

Image may differ from product. See technical specification for details.

Part No.
Part No. 0866FA00004
Equivalent to mcmaster :
94575A240

Basic Information

System of Measurement Inch
Nut Type Hex
Specifications Met MS51968-5; Fed. Spec. FF-N-836

Dimension Parameters

Width 1/2"
Height 17/64"

Thread Parameters

Thread Type UNF
Thread Size 5/16"-24
Thread Direction Right Hand
Thread Spacing Fine
Thread Fit Class 2B

Head Parameters

Drive Style External Hex
Hex Nut Profile Standard

Material & Strength Parameters

Material Cadmium Yellow-Chromate Plated Steel
Fastener Strength Grade/Class Grade 5
Technical Drawings No drawings available at the moment, will be launched soon
In Stock
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Key Features & Benefits at a Glance

  • Enhanced Corrosion Resistance: Cadmium yellow-chromate plating provides superior protection against rust and environmental degradation, extending service life in harsh conditions.
  • High-Strength Performance: Grade 5 classification ensures reliable load-bearing capacity and resistance to vibration loosening in demanding industrial applications.
  • Precision Thread Fit: Class 2B thread fit offers consistent engagement and reduced risk of cross-threading, facilitating easier assembly and disassembly.
  • Fine Thread Advantage: 5/16"-24 UNF fine threads deliver improved clamping force distribution and better retention under dynamic loads compared to coarse threads.
  • Standardized Compliance: Meets MS51968-5 and Fed. Spec. FF-N-836 standards, guaranteeing interchangeability and quality assurance for military and federal projects.
  • Optimized Drive Design: External hex drive allows for high-torque application with common tools, speeding up installation in time-sensitive operations.
  • Durable Material Construction: Steel core with specialized plating maintains structural integrity under stress while resisting chemical exposure.

Professional Applications & Engineering Value

This Grade 5 hex nut addresses critical engineering challenges in sectors like aerospace, automotive, and heavy machinery, where fastener failure can lead to operational downtime. Manufactured from cadmium yellow-chromate plated steel, it combats corrosion in humid or chemically aggressive environments, reducing maintenance frequency. The 5/16"-24 UNF fine threads with Class 2B fit ensure precise alignment and secure fastening, minimizing the risk of vibration-induced loosening in equipment subjected to constant motion. Its compliance with MS51968-5 and Fed. Spec. FF-N-836 makes it a trusted component for assemblies requiring adherence to strict military and industrial specifications, providing engineers with a reliable solution for high-stress connections.

Specification Summary & Compliance

This hex nut features a 5/16"-24 UNF thread size with fine spacing and Class 2B thread fit for consistent dimensional accuracy. It conforms to MS51968-5 and Federal Specification FF-N-836, ensuring manufacturing consistency and performance reliability. The inch system measurements (e.g., 1/2" width, 17/64" height) support seamless integration with existing imperial-based designs. Material and plating processes align with industry standards for durability, though specific RoHS or REACH declarations should be verified per batch requirements.

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