S-91030A040 1 1/4"-7 Flange Nuts

Key Features & Benefits at a Glance

• Enhanced Load Distribution - The 2 1/2" flange diameter spreads clamping force over a wider area, reducing surface pressure and preventing material damage
• Superior Corrosion Resistance - Black-oxide steel construction provides durable protection against rust and environmental degradation in harsh industrial settings
• Quick Installation Efficiency - Coarse UNC threads enable faster assembly and disassembly while maintaining secure fastening in high-vibration applications
• Reliable Thread Engagement - Class 2B thread fit ensures consistent, precise mating with male threads for dependable performance under heavy loads
• Optimized Tool Access - Standard external hex profile with 1 13/16" width accommodates common wrenching tools for straightforward installation and maintenance
• Environmental Compliance Assurance - RoHS 3 compliance with exemption 6(a) meets international regulatory standards for industrial applications
• Robust Structural Integrity - 0.25" flange thickness and 1 1/4" height provide substantial material strength for demanding heavy-duty applications

Professional Applications & Engineering Value

This heavy-duty flange nut addresses critical engineering challenges in industrial assembly where vibration resistance and load distribution are paramount. The black-oxide steel construction combined with the 2 1/2" flange diameter creates an optimal solution for applications requiring superior clamping force without damaging connected surfaces. The 1 1/4"-7 UNC coarse thread configuration ensures rapid installation in structural steel, heavy machinery, and construction equipment, while the Class 2B thread fit maintains precision alignment in high-stress environments. Engineered for external hex drive compatibility, this flange nut simplifies maintenance procedures in confined spaces, making it ideal for automotive, manufacturing, and infrastructure projects where reliability and ease of service are critical operational requirements.

Specification Summary & Compliance

This flange nut features Class 2B thread fit per UNC standards with precise 1 1/4"-7 coarse thread spacing, ensuring compatibility with standard mating components. Manufacturing adheres to UNC thread type specifications with right-hand thread direction for universal application. The product maintains RoHS 3 (2015/863/EU) compliance with exemption 6(a) for lead as an alloying element in steel, meeting international environmental regulations. Dimensional accuracy includes 2 1/2" flange diameter, 0.25" flange thickness, 1 13/16" width, and 1 1/4" height for consistent performance across industrial applications.