S-90977A150 5/16"-18 x 1 1/8" Coupling Nuts

Key Features & Benefits at a Glance

• Superior load-bearing capacity with Grade 5 strength classification, ideal for high-stress mechanical assemblies
• Enhanced corrosion resistance through zinc-plated steel construction, extending service life in harsh environments
• Reliable thread engagement with fully threaded UNC coarse pattern and Class 2B fit for vibration-resistant connections
• Optimized torque application via standard external hex drive design compatible with common industrial tools
• Precision dimensional consistency with 1/2" width and 1-1/8" length maintaining alignment in extended fastener systems
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for safe industrial usage
• Universal compatibility with right-hand threaded components in inch-system machinery and equipment

Professional Applications & Engineering Value

This Grade 5 coupling nut solves critical alignment challenges in extended shaft assemblies, conveyor systems, and structural frameworks where zinc-plated steel provides essential corrosion protection against industrial atmospheres. The fully threaded UNC coarse pattern with Class 2B fit ensures rapid assembly while maintaining vibration resistance in high-cycle applications. Engineered for heavy-duty coupling scenarios, the standardized external hex drive facilitates secure torquing with standard wrenches, reducing installation time in maintenance operations and production line configurations where reliable threaded extensions are paramount.

Specification Summary & Compliance

Manufactured to UNC thread standards with Class 2B thread fit tolerance for consistent engagement. Dimensions maintained at 5/16"-18 thread size with 1/2" width across flats and 1-1/8" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting international environmental and safety protocols for industrial fastener applications.