S-90498A042 1 3/8"-6 ASME B18.2.2 Hex Nuts

Key Features & Benefits at a Glance

• Enhanced load distribution due to the extra wide hex profile, reducing surface pressure and preventing material deformation in heavy-duty assemblies.
• Superior vibration resistance from the coarse UNC thread design, maintaining a secure hold in high-stress, dynamic industrial environments.
• Guaranteed interchangeability and precise fit with Class 2B thread tolerance, ensuring reliable mating with corresponding male threads for leak-proof and secure connections.
• High-torque capability provided by the external hex drive and robust steel construction, allowing for secure tightening with standard tools.
• Long-term reliability and compliance by meeting ASME B18.2.2 specifications, ensuring consistent performance and dimensional accuracy.
• Safe for regulated industries with full compliance to RoHS 3 and REACH regulations, making it suitable for sensitive and international applications.
• Optimized for inch-system machinery with a right-hand thread direction, providing seamless integration into existing North American and global industrial equipment.

Professional Applications & Engineering Value

This heavy-duty 1 3/8"-6 UNC extra wide hex nut is engineered to solve critical challenges in industrial fastening, such as joint failure under extreme loads and loosening from constant vibration. The coarse thread spacing and Class 2B thread fit ensure rapid assembly and a reliable seal, minimizing the risk of cross-threading in time-sensitive maintenance scenarios. Manufactured from high-strength steel, it provides exceptional durability for construction machinery, agricultural equipment, and large-scale structural frameworks where external hex drive accessibility is crucial. Its extra wide profile increases the bearing surface, effectively distributing clamp load and preventing flange damage, making it an indispensable component for engineers prioritizing safety and longevity in demanding applications.

Specification Summary & Compliance

This nut adheres to ASME B18.2.2 standards, with a Class 2B internal thread fit for consistent engagement and a UNC coarse thread (1 3/8"-6) in a right-hand direction. Dimensional accuracy is confirmed with a width of 2 3/16" and height of 1 11/32". The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for use in environmentally conscious and regulated industrial markets.