S-90521A283 2 1/2"-4 ASME B18.2.2, ASTM A194 Hex Nuts

Key Features & Benefits at a Glance

• Superior load distribution thanks to the extra wide profile, reducing surface pressure and preventing joint failure in heavy-duty applications
• Exceptional strength and reliability with ASTM Grade 2H certification, ensuring consistent performance under high stress and vibration
• Precise and secure fastening achieved through Class 2B thread fit, minimizing the risk of cross-threading and ensuring smooth assembly
• Enhanced durability in harsh environments due to high-quality steel construction, providing excellent resistance to wear and corrosion
• Broad compatibility with coarse UNC threads (2 1/2"-4), making it ideal for general industrial use with standard inch-system components
• Compliance with rigorous industry standards including ASME B18.2.2, guaranteeing dimensional accuracy and interchangeability
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements for hazardous substances

Professional Applications & Engineering Value

This heavy duty hex nut is engineered to address critical challenges in industrial fastening, where load distribution and vibration resistance are paramount. The extra wide profile significantly increases the bearing surface, reducing the risk of material deformation and loosening under dynamic loads. Made from high-strength steel and meeting ASTM Grade 2H requirements, it ensures reliable performance in structural applications, machinery assembly, and heavy equipment. The 2 1/2"-4 UNC coarse thread with right-hand direction facilitates quick installation and disassembly, while the external hex drive allows for high torque application with standard tools. Ideal for construction, mining, and manufacturing sectors, this nut provides long-term durability and safety in demanding environments.

Specification Summary & Compliance

This hex nut features a 2 1/2"-4 UNC coarse thread with Class 2B thread fit for precise engagement and dimensional accuracy per ASME B18.2.2. It measures 3 7/8" in width and 2 29/64" in height, manufactured from steel to ASTM A194 specifications. The nut complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from restricted hazardous substances. Its ASTM Grade 2H strength rating confirms it meets high mechanical property standards for reliable industrial use.