S-90477A029 1/4"-20 Flange Nuts

Key Features & Benefits at a Glance

• Enhanced Load Distribution: The 5/8" flange diameter spreads clamping force over a wider area, reducing surface pressure and preventing damage to assembled materials.
• Superior Corrosion Resistance: Black-oxide steel construction provides a durable, corrosion-resistant finish, extending the nut's service life in various industrial environments.
• Secure and Reliable Fastening: Class 2B thread fit ensures consistent, reliable engagement with mating bolts, minimizing the risk of loosening under vibration or dynamic loads.
• Efficient Installation and Removal: The external hex drive design allows for easy application of standard wrenches, speeding up assembly and maintenance processes.
• Optimized for High-Stress Applications: The coarse UNC thread and robust steel build make it ideal for heavy-duty, rotating applications where strength and durability are critical.
• Regulatory Compliance Assurance: RoHS 3 compliant with exemption 6(a), meeting environmental standards for use in regulated industries without compromising performance.
• Versatile Industrial Use: Right-hand thread and standard hex profile enable broad compatibility across machinery, automotive, and construction assemblies.

Professional Applications & Engineering Value

This heavy-duty flange nut is engineered to address common challenges in industrial fastening, such as vibration-induced loosening and surface damage. The integrated steel flange acts as a built-in washer, eliminating the need for separate components and reducing assembly time while providing a larger bearing surface that distributes load effectively. Made from black-oxide steel, it offers enhanced resistance to rust and wear, making it suitable for harsh environments like automotive systems, machinery frames, and outdoor equipment. The 1/4"-20 UNC coarse thread ensures quick installation and reliable performance in rotating applications, where its Class 2B thread fit maintains secure connections under stress. By combining material durability with precise engineering, this nut delivers long-term reliability and reduces maintenance costs in B2B settings.

Specification Summary & Compliance

This flange nut adheres to UNC thread standards with a Class 2B thread fit for consistent accuracy and compatibility. Key dimensions include a thread size of 1/4"-20, flange diameter of 5/8", and height of 3/8". It is manufactured from steel with a black-oxide finish and complies with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as an alloying element in steel, ensuring environmental regulatory adherence without sacrificing mechanical properties.