S-90659A101 1/4"-20 Flange Nuts

Key Features & Benefits at a Glance

• Superior vibration resistance through serrated locking technology that prevents loosening under dynamic loads
• Enhanced corrosion protection with zinc-plated steel construction for extended service life in harsh environments
• Reliable thread engagement with UNC coarse threads and Class 2B fit ensuring consistent performance
• Integrated flange design eliminates need for separate washers while providing superior load distribution
• Easy installation and removal with standard external hex drive compatible with common tools
• Right-hand threading conforms to industry standards for straightforward assembly processes
• Regulatory compliance meets RoHS 3 and REACH requirements for industrial safety standards

Professional Applications & Engineering Value

This heavy-duty flange lock nut addresses critical vibration-induced loosening challenges in industrial applications. The zinc-plated steel construction provides essential corrosion resistance for outdoor equipment, automotive assemblies, and machinery exposed to environmental elements. The serrated locking mechanism creates permanent resistance to rotational forces, making it ideal for high-vibration environments like power transmission systems, conveyor equipment, and heavy machinery. The UNC coarse thread configuration ensures rapid assembly while maintaining secure fastening integrity. The integrated flange design distributes clamping force over a wider surface area (47/64" diameter), reducing point stress and preventing surface damage to connected components. This combination of vibration resistance and corrosion protection delivers long-term reliability in demanding industrial settings.

Specification Summary & Compliance

This flange lock nut features precision 1/4"-20 UNC coarse threads with Class 2B fit for consistent thread engagement. The external hex drive (7/16" width) provides standard tool compatibility, while the 19/64" height and 0.04" flange thickness ensure optimal strength-to-weight ratio. Manufactured to industry standards with right-hand threading and serrated locking design. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental safety and industrial applications.