S-91991A101 1/4"-20 Hex Nuts

Key Features & Benefits at a Glance

• Enhanced Durability: Black-oxide steel construction provides superior corrosion resistance, extending service life in harsh industrial environments.
• Superior Grip & Torque Application: Extra wide hex profile offers improved wrench engagement, reducing slippage and enabling higher torque application for secure fastening.
• Reliable Coarse Thread Performance: 1/4"-20 UNC coarse threads ensure quick assembly and reduced cross-threading risks, ideal for high-vibration applications.
• Precision Thread Fit: Class 2B thread fit guarantees consistent, reliable engagement with mating components, minimizing loosening and ensuring joint integrity.
• Broad Industrial Compatibility: Right-hand thread and external hex drive design make it compatible with standard tools and common assembly practices across various sectors.
• Regulatory Compliance Assurance: Meets RoHS 3 and REACH environmental standards, ensuring safe use in regulated industries and global market acceptance.
• Optimized Dimensions: 1/2" width and 15/64" height provide a robust footprint for enhanced load distribution and stability in heavy-duty applications.

Professional Applications & Engineering Value

This heavy-duty 1/4"-20 UNC hex nut is engineered to address critical challenges in industrial assembly, where vibration resistance, rapid installation, and long-term reliability are paramount. The black-oxide steel material offers excellent protection against rust and wear, making it suitable for automotive, machinery, and construction applications exposed to moisture or chemicals. Its extra wide profile enhances tool contact, allowing for higher torque without damaging the nut, which is crucial for maintaining coarse thread integrity under dynamic loads. The Class 2B thread fit ensures smooth engagement with UNC threaded bolts, reducing assembly time and preventing failures in high-stress environments. By combining robust materials with precision engineering, this nut delivers consistent performance in industrial settings, minimizing downtime and maintenance costs.

Specification Summary & Compliance

This hex nut adheres to inch system standards with precise dimensions: 1/4"-20 UNC thread size, coarse spacing, and Class 2B thread fit for accurate tolerance. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are met. Manufactured to consistent quality, it supports reliable performance in various engineering applications.