S-90521A275 1 1/4"-8 ASTM A194 Hex Nuts

Key Features & Benefits at a Glance

• Superior load distribution thanks to the extra wide 2" hex profile, minimizing surface pressure and preventing joint failure in heavy machinery.
• High tensile strength and reliability with ASTM Grade 2H certification, ensuring dependable performance under extreme vibration and load conditions.
• Effortless installation and time savings with a coarse 8-UN thread and Class 2B fit, enabling quick assembly without cross-threading risks.
• Enhanced durability and corrosion resistance from high-quality steel construction, providing long service life in demanding industrial environments.
• Broad compatibility and interchangeability by meeting ASTM A194 specifications, guaranteeing fit with standard 1 1/4"-8 coarse threaded bolts.
• Safe and sustainable sourcing with full compliance to RoHS 3 and REACH environmental standards, supporting responsible manufacturing practices.
• Secure external hex drive design allows for high-torque application using common wrenches, ensuring tight, reliable fastening.

Professional Applications & Engineering Value

This heavy-duty hex nut is engineered to solve critical challenges in structural and mechanical assemblies where vibration resistance and high clamp load are paramount. The ASTM Grade 2H steel construction provides a proven strength rating that prevents loosening under dynamic stresses, making it ideal for construction equipment, mining machinery, and large-scale industrial frames. The extra wide profile significantly increases the bearing surface, distributing load more effectively to protect softer materials from damage. Combined with a coarse UN thread and Class 2B fit, it ensures rapid, reliable installation in field maintenance and production lines, reducing downtime. This nut delivers consistent performance in right-hand threaded applications, meeting the rigorous demands of the inch system in global industrial projects.

Specification Summary & Compliance

This hex nut adheres to precise dimensional standards, including a 1 1/4"-8 coarse thread with UN Class 2B thread fit for consistent engagement. It is manufactured in compliance with ASTM A194 for heavy-duty nuts and carries the ASTM Grade 2H strength classification. Environmental and safety commitments are verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring the product is free of restricted substances.