S-90977A130 1/4"-20 x 7/8" Coupling Nuts

Key Features & Benefits at a Glance

• Superior load-bearing capacity with Grade 5 strength classification, ensuring reliable performance under high-stress conditions.
• Enhanced corrosion resistance from zinc-plated steel construction, extending service life in harsh industrial environments.
• Precise thread engagement with Class 2B UNC coarse threads, providing consistent fit and reducing cross-threading risks.
• Versatile full-thread design allowing connection of two externally threaded rods or bolts of equal diameter.
• Easy installation and removal using standard wrenches on the external hex drive, saving assembly time.
• Compliance with environmental regulations including RoHS 3 and REACH, ensuring safe use in regulated industries.
• Robust construction with 1/2" width and 7/8" length, offering durability for heavy-duty mechanical applications.

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel coupling nut delivers exceptional engineering value by addressing critical connection challenges in industrial assemblies. The fully threaded UNC coarse thread design ensures maximum thread engagement when joining threaded rods or extended bolts, preventing loosening under vibration—a common failure point in machinery and structural frameworks. The zinc plating provides a sacrificial layer that resists rust and corrosion, making it ideal for outdoor equipment, automotive suspensions, and construction applications where environmental exposure is a concern. With its external hex drive, technicians can apply high torque without damaging the fastener, streamlining maintenance in tight spaces. This coupling nut solves alignment issues in long-span assemblies while maintaining Class 2B thread fit precision for leak-free fluid systems and secure structural joints.

Specification Summary & Compliance

This coupling nut meets UNC 1/4"-20 coarse thread specifications with Class 2B thread fit tolerances for consistent mating with Class 2A external threads. Manufactured from zinc-plated steel and rated Grade 5 for mechanical strength, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring restriction of hazardous substances. The right-hand threaded, fully threaded profile follows standardized industrial fastener dimensions for interoperability.