S-90268A442 5/8"-18 x 4" Coupling Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 stainless steel construction, ideal for harsh industrial environments
• Enhanced load distribution with 4" extra long profile for secure connections in extended applications
• Precision thread engagement with Class 2B fit ensuring reliable, vibration-resistant assemblies
• Optimized installation efficiency through external hex drive design for easy tool access
• Reduced material stress with partially threaded design minimizing thread fatigue in dynamic applications
• Compliance assurance meeting RoHS 3 and REACH standards for global regulatory requirements
• Fine thread accuracy with 5/8"-18 UNF specification providing superior clamping force control

Professional Applications & Engineering Value

This extra long coupling nut delivers critical engineering solutions where standard fasteners fall short. The 18-8 stainless steel composition provides exceptional corrosion resistance for demanding applications in marine, chemical processing, and outdoor infrastructure. With its 4" length and partially threaded design, it effectively bridges gaps between threaded rods or studs while minimizing stress concentration points. The 5/8"-18 UNF fine threading with Class 2B fit ensures precise engagement in high-vibration environments, making it ideal for mechanical assemblies, structural frameworks, and heavy equipment where reliability is paramount. The external hex drive facilitates straightforward installation even in confined spaces.

Specification Summary & Compliance

This coupling nut features 5/8"-18 UNF fine threading with Class 2B thread fit per UNF standards, ensuring dimensional accuracy and interchangeability. The 4" length with 15/16" minimum thread length provides extended engagement capability. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental compliance for industrial and international applications.