S-94831A661 1/2"-13 Flange Nuts

Key Features & Benefits at a Glance

• Superior vibration resistance through precision serrations that bite into mating surfaces, preventing loosening under dynamic loads
• Integrated flange design eliminates need for separate washers, reducing assembly time and part count
• Corrosion-resistant zinc plating provides durable surface protection for extended service life in industrial environments
• Coarse UNC thread profile enables faster installation and reduced cross-threading risk compared to fine threads
• Class 2B thread fit ensures consistent engagement and reliable performance across standard applications
• External hex drive design offers compatibility with common wrenching tools for straightforward installation
• Wide 1-1/32" flange diameter distributes clamping force over larger area, minimizing surface damage

Professional Applications & Engineering Value

This zinc-plated steel flange lock nut addresses critical vibration-induced failure points in industrial fastening applications. The serrated locking mechanism creates permanent resistance to rotational loosening, making it ideal for machinery, automotive assemblies, and structural frameworks subject to constant motion or impact. The UNC coarse thread configuration provides excellent engagement in materials where fine threads might strip, while the integrated flange design serves as both locking element and load-bearing washer. Engineered for heavy-duty applications, this fastener maintains clamping force integrity even under extreme vibration conditions, reducing maintenance frequency and preventing equipment downtime in manufacturing, construction, and transportation sectors.

Specification Summary & Compliance

This 1/2"-13 UNC flange lock nut features Class 2B thread fit per ASME B1.1 standards, ensuring proper clearance and engagement with Class 2A external threads. The coarse thread spacing follows Unified National Coarse specifications for reliable performance. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming absence of restricted hazardous substances. Critical dimensions include 3/4" width across flats, 29/64" height, 1-1/32" flange diameter, and 0.13" flange thickness for consistent performance in standard applications.