S-90521A290 1 3/8"-6 ASME B18.2.2, ASTM A194 Hex Nuts

Key Features & Benefits at a Glance

• Exceptional load distribution due to the extra wide profile, minimizing stress concentration and preventing joint failure in high-vibration environments.
• Superior torque resistance from the external hex drive and coarse UNC threads, ensuring secure fastening and reducing the risk of stripping during installation.
• Guaranteed high-strength performance with ASTM Grade 2H certification, providing reliable clamping force for the most demanding heavy-duty applications.
• Precision thread fit with Class 2B tolerance, ensuring smooth assembly and consistent engagement with mating components for a secure connection.
• Rigorous quality assurance through compliance with ASME B18.2.2 and ASTM A194 standards, guaranteeing dimensional accuracy and material integrity.
• Enhanced durability and corrosion resistance from high-quality steel construction, extending service life in harsh industrial conditions.
• Environmental and regulatory compliance with RoHS 3 and REACH, making them suitable for global supply chains and environmentally conscious projects.

Professional Applications & Engineering Value

This heavy-duty hex nut is engineered to solve critical challenges in structural and machinery applications where vibration, dynamic loads, and high torque are constant concerns. The extra wide profile significantly increases the bearing surface area, which effectively distributes clamping force and prevents damage to connected materials. Manufactured from high-strength steel and meeting ASTM Grade 2H requirements, it ensures a reliable, non-loosening fit that is vital for construction equipment, industrial machinery, and large-scale structural frameworks. The 1 3/8"-6 UNC coarse thread facilitates quicker assembly and provides superior resistance to cross-threading and seizing, even in dirty or rugged environments. This combination of a robust external hex drive for high-torque tooling and a Class 2B thread fit delivers predictable, repeatable performance that engineers and procurement specialists can depend on for mission-critical assemblies.

Specification Summary & Compliance

This nut features a 1 3/8"-6 UNC thread with coarse spacing and a Class 2B thread fit for consistent engagement. Key dimensions include a 2 3/16" width and 1 11/32" height. It is manufactured in compliance with ASME B18.2.2 and ASTM A194 standards, and meets the material requirements for ASTM Grade 2H. The product is also verified to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant.