S-91045A031 3/8"-16 Flange Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide steel construction, extending service life in harsh industrial environments
• Enhanced load distribution through the 7/8" flange diameter, reducing surface pressure and preventing material damage
• Precise leveling capability with 1° maximum correction for accurate alignment in machinery and structural applications
• Reliable thread engagement with Class 2B thread fit ensuring consistent performance in coarse UNC threading
• Quick installation using standard external hex drive compatible with common industrial tools
• Built-in washer functionality eliminates separate components, saving assembly time and reducing inventory complexity
• Environmental compliance with RoHS 3 standards, meeting international regulatory requirements for industrial use

Professional Applications & Engineering Value

This heavy-duty flange nut addresses critical challenges in industrial assembly where vibration resistance and permanent alignment are paramount. The black-oxide steel construction provides essential corrosion protection for applications in manufacturing equipment, automotive systems, and structural frameworks exposed to environmental elements. The integrated 7/8" flange distributes clamping force over a wider area, preventing loosening under dynamic loads while protecting sensitive surfaces from damage. With its UNC coarse threading and Class 2B thread fit, this nut maintains secure fastening in high-vibration environments where fine-thread fasteners might fail. The 1° leveling correction capability proves invaluable in machinery installation and precision equipment mounting, allowing technicians to make fine adjustments without disassembling entire structures. The external hex drive design ensures compatibility with standard industrial wrenches, streamlining maintenance procedures in tight spaces.

Specification Summary & Compliance

This flange nut features precise Class 2B thread fit per UNC standards with 3/8"-16 coarse thread spacing and right-hand threading. Manufacturing specifications include a 7/8" flange diameter with 0.13" thickness, 11/16" width, and 21/32" height. The integrated steel washer measures 5/32" thickness. The product is RoHS 3 (2015/863/EU) compliant with exemption 6(a) for lead as an alloying element in steel, meeting international environmental standards for industrial components.