S-90268A443 5/8"-18 x 5" Coupling Nuts

Key Features & Benefits at a Glance

• Extended 5" length provides superior grip and stability for connecting long threaded rods or bolts in structural applications
• Corrosion-resistant 18-8 stainless steel construction ensures long-term durability in harsh environments and outdoor installations
• UNF fine threading (5/8"-18) delivers enhanced vibration resistance and precise load distribution compared to coarse threads
• Class 2B thread fit guarantees consistent, reliable engagement with mating components while maintaining assembly efficiency
• External hex drive design enables high-torque installation using standard wrenches for secure connections
• Partial threading with 15/16" minimum thread length optimizes strength-to-weight ratio while maintaining full functional engagement
• Full regulatory compliance with RoHS 3 and REACH standards ensures environmental responsibility and global market acceptance

Professional Applications & Engineering Value

This extra long coupling nut solves critical connection challenges in industrial assembly and construction applications where standard nuts cannot bridge extended gaps between threaded components. The 18-8 stainless steel material provides exceptional corrosion resistance, making it ideal for marine environments, chemical processing equipment, and outdoor structures exposed to weather elements. The UNF fine threading (5/8"-18) offers superior resistance to vibration loosening compared to coarse threads, ensuring maintained tension in dynamic load applications. With its external hex drive style and partial threading design, this coupling nut delivers optimal torque transmission during installation while minimizing material usage without compromising the 15/16" minimum thread engagement required for secure connections in heavy-duty mechanical systems.

Specification Summary & Compliance

This coupling nut maintains Class 2B thread fit per UNF standards (5/8"-18) with precise dimensional control including 5" length, 7/8" width across flats, and minimum 15/16" thread length. Manufactured to inch system specifications with right-hand, partially threaded configuration. The component is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting the latest environmental standards for industrial fasteners while ensuring material traceability and workplace safety compliance.