S-90997A800 5/16"-18 Flange Nuts

Flange Nuts

1243FA00018 Flange Nuts
1243FA00018 Flange Nuts

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

Part No.
Part No. 1243FA00018
Equivalent to mcmaster :
90997A800

Basic Information

System of Measurement Inch
Nut Type Flange

Dimension Parameters

Width 3/8"
Height 11/32"

Thread Parameters

Thread Type UNC
Thread Size 5/16"-18
Thread Direction Right Hand
Thread Spacing Coarse
Thread Fit Class 3B

Head Parameters

Drive Style External 12-Point
Hex Nut Profile Standard

Flange Parameters

Flange Diameter 17/32"
Flange Thickness 0.08"

Material & Strength Parameters

Material A286 Stainless Steel
Technical Drawings No drawings available at the moment, will be launched soon
In Stock
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Key Features & Benefits at a Glance

  • Superior corrosion resistance with A286 stainless steel material, ideal for harsh industrial environments and extended service life
  • Enhanced load distribution from the 17/32" flange diameter, reducing surface pressure and preventing joint loosening
  • High-torque capability through the external 12-point drive design, enabling secure installation in confined spaces
  • Precise thread engagement with Class 3B fit, ensuring reliable, vibration-resistant connections in critical assemblies
  • Time-saving installation using coarse UNC threads, allowing for quick assembly and disassembly in maintenance operations
  • Durable construction with standard hex profile and right-hand threading, providing consistent performance under mechanical stress

Professional Applications & Engineering Value

This A286 stainless steel flange nut is engineered to address common challenges in heavy-duty industrial applications, such as vibration-induced loosening and corrosion in aggressive environments. The combination of Class 3B thread fit and external 12-point drive ensures maximum torque transmission and secure fastening in high-stress assemblies, from machinery to aerospace components. The 17/32" flange diameter distributes clamping force evenly, minimizing the risk of damage to connected surfaces. Made from corrosion-resistant A286 material, it withstands extreme temperatures and corrosive conditions, reducing maintenance needs and enhancing operational reliability in sectors like automotive, oil and gas, and structural engineering.

Specification Summary & Compliance

This flange nut adheres to UNC coarse thread standards with precise Class 3B thread fit for superior dimensional accuracy. It features a 5/16"-18 thread size, 17/32" flange diameter, and external 12-point drive design, manufactured in compliance with industry specifications for reliable performance. The A286 stainless steel construction meets requirements for durability and resistance, ensuring compatibility with RoHS and REACH environmental directives for safe use in various industrial settings.

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