S-90521A050 2 1/4"-8 ASME B18.2.2, ASTM A194 Hex Nuts

Key Features & Benefits at a Glance

• Exceptional load distribution with an extra wide hex profile, reducing stress concentration and preventing joint failure in heavy-duty assemblies.
• High-strength performance backed by ASTM Grade 2H certification, ensuring reliable clamping force and resistance to vibration loosening.
• Precise coarse threading (2 1/4"-8 UN) for faster installation and reduced risk of cross-threading in time-sensitive industrial applications.
• Superior thread fit (Class 2B) providing consistent engagement and smooth assembly with mating bolts, minimizing play and enhancing joint integrity.
• Full compliance with ASME B18.2.2 standards, guaranteeing dimensional accuracy and interchangeability in regulated engineering projects.
• Robust steel construction offering excellent durability and corrosion resistance for long service life in harsh operating environments.
• Environmental responsibility with RoHS 3 and REACH compliance, meeting strict regulatory requirements for hazardous substance control.

Professional Applications & Engineering Value

This heavy-duty hex nut is engineered to address critical challenges in structural and machinery applications where vibration resistance and load capacity are paramount. The extra wide profile significantly increases bearing surface area, distributing clamp load more effectively to prevent material deformation and bolt fatigue—common issues in high-stress assemblies like construction equipment, bridge supports, and industrial machinery frames. Manufactured from high-strength steel and featuring a coarse thread (2 1/4"-8 UN) with Class 2B fit, it ensures rapid, reliable installation even in field conditions, reducing downtime. Compliant with ASME B18.2.2 and ASTM A194, this nut delivers consistent performance in inch system applications, providing engineers with a dependable, specification-compliant solution for demanding fastening requirements.

Specification Summary & Compliance

This hex nut adheres to Class 2B thread fit tolerances per UN standards, ensuring precise engagement with mating threads. It meets ASME B18.2.2 dimensional requirements and is manufactured under ASTM Grade 2H for strength certification. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in environmentally conscious industrial markets.