S-90477A115 5/8"-18 Flange Nuts

Key Features & Benefits at a Glance

• Built-in Flange Design eliminates the need for separate washers, reducing assembly time and part count while providing superior load distribution
• Black-Oxide Steel Construction offers excellent corrosion resistance for extended service life in demanding industrial environments
• Class 2B Thread Precision ensures smooth, reliable engagement with mating components, minimizing cross-threading risks
• 1-3/8" Flange Diameter creates a wider bearing surface that prevents loosening under vibration and distributes clamping force effectively
• UNF Fine Thread Configuration provides superior resistance to vibration loosening compared to coarse thread alternatives
• External Hex Drive Style enables high-torque installation with standard tools for secure fastening in rotating applications
• RoHS 3 Compliance meets international environmental standards while maintaining mechanical performance with lead exemption

Professional Applications & Engineering Value

This black-oxide steel flange nut delivers exceptional performance in rotating applications where vibration resistance and reliable clamping force are critical. The integrated 1-3/8" steel flange acts as a built-in washer, distributing load over a wider surface area to prevent material damage and maintain joint integrity. Engineered with UNF fine threads and Class 2B thread fit, this fastener ensures precise mating with corresponding components while the external hex drive accommodates high-torque installation requirements. The black-oxide surface treatment provides corrosion protection without compromising dimensional accuracy, making it ideal for industrial machinery, automotive assemblies, and heavy equipment where rotating flange nuts must withstand dynamic loads and environmental exposure.

Specification Summary & Compliance

This 5/8"-18 UNF flange nut features Class 2B thread fit per UNF standards, ensuring dimensional accuracy and proper thread engagement. The nut measures 1-1/16" across flats with 29/32" height and incorporates a 1-3/8" diameter flange with 0.25" thickness. Manufactured from steel with black-oxide finish, this component is RoHS 3 (2015/863/EU) compliant with exemption 6(a) for lead as an alloying element in steel, meeting international environmental regulations while maintaining mechanical performance standards for industrial applications.