S-90268A203 2-56 x 5/16" Coupling Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 18-8 stainless steel construction, ideal for harsh environments and long-term reliability.
• Easy installation and removal with external hex drive design, allowing for standard wrench or socket tool compatibility.
• Secure and precise thread engagement with Class 2B thread fit, minimizing cross-threading and ensuring consistent assembly quality.
• Robust connection strength from fully threaded UNC coarse threading, providing excellent load distribution in coupling applications.
• Wide industrial applicability with compact 3/16" width and 5/16" length, fitting space-constrained assemblies without compromising performance.
• Compliance with environmental standards including RoHS 3 and REACH, ensuring safe use in regulated industries and global markets.
• Durable right-hand threading for standard rotational fastening, enhancing operational efficiency in repetitive assembly tasks.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, this 2-56 UNC coupling nut in 18-8 stainless steel addresses common challenges like corrosion-induced failure and assembly misalignment. The external hex drive facilitates quick tool access, reducing installation time in tight spaces, while the fully threaded coarse UNC thread design ensures reliable load-bearing capacity for connecting rods, shafts, or threaded bars. Its Class 2B thread fit guarantees precise tolerance, preventing loosening under vibration—a critical feature in machinery, automotive, and electronics assemblies. By combining corrosion resistance with high-strength performance, this nut minimizes maintenance needs and extends service life in humid or chemical-exposed environments.

Specification Summary & Compliance

This coupling nut adheres to UNC coarse thread standards with a Class 2B thread fit for consistent dimensional accuracy. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances. Manufactured with a standard coupling nut profile, it features a right-hand thread direction and is fully threaded for uniform stress distribution. Dimensions include a 3/16" width and 5/16" length, conforming to inch-system specifications for seamless integration in various industrial fastening systems.