S-90477A037 7/8"-9 Flange Nuts

Key Features & Benefits at a Glance

• Enhanced load distribution with 1-3/4" flange diameter prevents surface damage and reduces the need for separate washers
• Superior corrosion resistance from black-oxide steel construction ensures long-term reliability in harsh industrial environments
• Quick installation and removal with standard external hex drive design and coarse UNC threads for efficient assembly operations
• Secure vibration-resistant fastening through Class 2B thread fit maintaining consistent clamping force in rotating applications
• Reduced maintenance requirements with rotating performance properties that withstand dynamic loading conditions
• Compliance with global standards including REACH and RoHS 3 ensures environmental responsibility and international project compatibility
• Optimized strength-to-weight ratio from precision-engineered steel construction delivers heavy-duty performance without unnecessary bulk

Professional Applications & Engineering Value

This black-oxide steel flange nut addresses critical engineering challenges in industrial fastening applications where vibration resistance and corrosion protection are paramount. The integrated 1-3/4" flange distributes clamping force across a wider surface area, preventing joint loosening in rotating equipment and machinery subjected to constant motion. The 7/8"-9 UNC coarse threads with Class 2B thread fit provide reliable engagement while accommodating minor misalignments, making them ideal for assembly line production where speed and consistency are essential. The external hex drive configuration ensures compatibility with standard tools, reducing installation time and labor costs in maintenance operations across automotive, construction, and heavy equipment sectors.

Specification Summary & Compliance

This flange nut features precision UNC coarse threads (7/8"-9) with Class 2B thread fit per ASME B1.1 standards, ensuring proper engagement and reliable performance. The black-oxide surface treatment on steel construction provides consistent corrosion protection while maintaining dimensional accuracy. Manufacturing complies with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) directives, meeting international environmental and safety requirements for industrial components. The flange diameter of 1-3/4" with 0.44" thickness delivers optimal load distribution characteristics for demanding applications.