S-90983A261 1/4"-28 x 7/8" Coupling Nuts

Key Features & Benefits at a Glance

• Exceptional tensile strength with Grade 8 classification, ensuring reliable performance in high-stress industrial applications.
• Superior corrosion resistance from zinc-plated steel construction, extending service life in harsh environments.
• Precise thread engagement with Class 2B fit and UNF fine threading, providing secure, vibration-resistant connections.
• Easy installation and removal thanks to the external hex drive design, compatible with standard wrenches.
• Full-threaded length of 7/8" allows for maximum adjustability and strong coupling between threaded rods or bolts.
• Compliance with environmental standards including RoHS 3 and REACH, ensuring safe and sustainable usage.
• Right-hand thread direction for standard assembly processes, reducing installation errors.

Professional Applications & Engineering Value

This Grade 8 zinc-plated steel coupling nut is engineered to address critical challenges in heavy-duty mechanical and structural assemblies. Its UNF fine thread design and Class 2B thread fit ensure tight, reliable connections that resist loosening under vibration and dynamic loads, common in machinery, automotive, and construction sectors. The zinc plating provides a durable barrier against rust and corrosion, making it ideal for outdoor or humid environments. With a fully threaded body and external hex drive, it simplifies alignment and torque application, reducing assembly time and enhancing operational efficiency in industrial fastening systems.

Specification Summary & Compliance

This coupling nut adheres to UNF fine thread standards with a size of 1/4"-28 and Class 2B thread fit for precise dimensional accuracy. Manufactured from high-strength steel with zinc plating, it meets Grade 8 strength requirements and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safety and sustainability in industrial use.