S-91030A445 5/8"-18 Flange Nuts

Key Features & Benefits at a Glance

• Enhanced Load Distribution with 1-3/8" flange diameter for superior surface contact and reduced risk of material damage
• Corrosion-Resistant Protection through black-oxide steel coating for extended service life in demanding environments
• Precision Thread Engagement with Class 2B UNF fine threads ensuring reliable, vibration-resistant connections
• High-Torque Capability featuring standard external hex drive for secure installation with common industrial tools
• Optimized Flange Design combining 0.19" thickness with 13/16" height for balanced strength-to-weight ratio
• Regulatory Compliance meeting RoHS 3 standards for environmentally responsible manufacturing
• Right-Hand Thread Compatibility for seamless integration with standard industrial equipment and components

Professional Applications & Engineering Value

This black-oxide steel flange nut delivers exceptional performance in heavy-duty industrial applications where vibration resistance and corrosion protection are critical. The UNF fine thread configuration (5/8"-18) provides superior clamping force distribution compared to coarse threads, while the Class 2B thread fit ensures consistent engagement without binding. The integrated 1-3/8" flange eliminates the need for separate washers, reducing assembly time and potential failure points. The black-oxide surface treatment creates a protective barrier against moisture and chemicals, making these flange nuts ideal for automotive, machinery, and structural applications requiring long-term reliability in challenging operating conditions.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2B thread fit per UNF specifications, ensuring consistent performance across applications. The external hex drive (1-1/16" width) accommodates standard industrial wrenches, while the right-hand thread direction follows conventional fastening systems. Compliant with RoHS 3 (2015/863/EU) standards under exemption 6(a) for lead as an alloying element in steel, meeting international environmental regulations for industrial components.