S-91030A033 1/2"-13 Flange Nuts

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with black-oxide coating for extended service life in demanding industrial environments
• Superior load distribution through the 1 1/8" flange diameter, reducing surface pressure and preventing material damage
• Reliable thread engagement with Class 2B thread fit ensuring consistent performance in high-vibration applications
• Quick installation via external hex drive design compatible with standard tools for efficient assembly operations
• Robust construction using steel material for exceptional strength and durability in heavy-duty fastening applications
• Industry-standard compatibility with 1/2"-13 UNC coarse threads for seamless integration with existing components
• Environmental compliance meeting RoHS 3 standards for responsible manufacturing and global market acceptance

Professional Applications & Engineering Value

This heavy-duty flange nut addresses critical engineering challenges in industrial assembly where vibration resistance and corrosion protection are paramount. The black-oxide steel construction provides superior corrosion resistance compared to untreated fasteners, significantly extending service life in harsh environments. The integrated 1 1/8" flange eliminates the need for separate washers by distributing clamp load over a wider surface area, preventing joint loosening under dynamic loads. With UNC coarse threads and Class 2B thread fit, this nut maintains secure fastening in high-vibration machinery, automotive assemblies, and structural applications where reliability is non-negotiable. The external hex drive ensures compatibility with standard wrenching tools, streamlining installation in confined spaces common in industrial maintenance and manufacturing operations.

Specification Summary & Compliance

This flange nut features precise Class 2B thread fit per UNC standards with 1/2"-13 coarse thread specifications. Manufacturing complies with industry standards for dimensional accuracy, including 7/8" width across flats and 11/16" height profile. The product meets RoHS 3 (2015/863/EU) compliance with exemption 6(a) for lead as an alloying element in steel, ensuring environmental regulatory adherence for global industrial applications. The right-hand thread direction and 0.19" flange thickness provide consistent performance metrics suitable for engineering specifications and quality-controlled assembly processes.