S-99149A121 1/4"-20 ASME B18.2.2 Hex Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance with black protective coating on 6061 aluminum for extended service life in harsh environments
• Reliable thread engagement with Class 2B thread fit ensuring consistent fastening performance and vibration resistance
• Industry-standard compatibility through ASME B18.2.2 compliance for seamless integration with existing assemblies
• Optimized torque transmission with standard external hex drive design for efficient installation using common tools
• Environmental regulation compliance meeting RoHS 3 and REACH standards for safe, sustainable industrial use
• Coarse thread advantage with 1/4"-20 UNC configuration providing faster assembly and reduced cross-threading risk
• Lightweight durability combining aluminum's strength-to-weight ratio with protective coating for demanding applications

Professional Applications & Engineering Value

Engineered for industrial environments where corrosion resistance and weight reduction are critical, this 1/4"-20 UNC hex nut solves common challenges in outdoor equipment, marine applications, and electronic enclosures. The black corrosion-resistant coating on 6061 aluminum provides superior protection against oxidation and chemical exposure while maintaining electrical conductivity. With its coarse thread design and Class 2B thread fit, this fastener resists vibration loosening and enables rapid assembly in high-volume production settings. The standard hex profile ensures compatibility with common wrenches, reducing installation time and tooling requirements across manufacturing, automotive, and infrastructure projects where reliable, repeatable fastening is essential.

Specification Summary & Compliance

This 1/4"-20 UNC hex nut features Class 2B thread fit per ASME B18.2.2 specifications with coarse thread spacing for optimal performance. Manufacturing complies with ASME B18.2.2 standards ensuring dimensional accuracy with 7/16" width and 7/32" height. The component is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant (including 223 SVHCs as of 01/17/2022), meeting international environmental regulations for industrial fastener applications.