S-90521A104 1/4"-28 ASME B18.2.2, ASTM A194 Hex Nuts

Key Features & Benefits at a Glance

• Superior load distribution with extra wide profile for enhanced stability and reduced risk of loosening under vibration
• Exceptional tensile strength from ASTM Grade 2H steel construction, ensuring reliable performance in demanding applications
• Precise thread engagement with Class 2B fit and UNF fine threads for secure, vibration-resistant fastening
• Full compliance with ASME B18.2.2 and ASTM A194 standards, guaranteeing consistent quality and dimensional accuracy
• Environmental responsibility through RoHS 3 and REACH compliance, meeting strict regulatory requirements
• Optimized installation with standard 1/2" width and external hex drive for easy wrench access and efficient assembly
• Long-term reliability with right-hand thread direction and fine thread spacing for superior resistance to shock and fatigue

Professional Applications & Engineering Value

This heavy-duty hex nut delivers critical engineering solutions where vibration resistance and structural integrity are paramount. Manufactured from ASTM Grade 2H steel, it provides exceptional clamp load retention in machinery, structural frameworks, and industrial equipment subjected to dynamic stresses. The extra wide profile significantly increases bearing surface area, preventing embedding in softer materials and distributing loads more effectively. With UNF fine threads and Class 2B thread fit, it maintains precise engagement in applications requiring fine adjustment capabilities and superior resistance to loosening. The combination of ASME B18.2.2 compliance and robust material properties makes this inch-system fastener ideal for automotive assemblies, heavy machinery, and construction applications where reliability cannot be compromised.

Specification Summary & Compliance

This 1/4"-28 UNF hex nut features Class 2B thread fit per ASME standards with dimensional specifications including 1/2" width and 15/64" height. Manufactured in compliance with ASME B18.2.2 and ASTM A194 specifications, it meets ASTM Grade 2H strength requirements. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to environmental regulations while maintaining precision engineering standards for industrial applications.