S-90949A218 1/2"-13 Flange Nuts

Key Features & Benefits at a Glance

• Superior vibration resistance through distorted thread locking technology that maintains secure fastening in high-stress environments
• Enhanced corrosion protection with zinc yellow-chromate plating that extends service life in demanding industrial conditions
• Integrated flange design eliminates need for separate washers while providing superior load distribution
• Reliable coarse threading (UNC 1/2"-13) ensures quick installation and removal while maintaining holding strength
• Grade G strength classification guarantees consistent performance and durability in heavy-duty applications
• Class 2B thread fit provides optimal balance between easy assembly and secure fastening retention
• External hex drive compatibility allows for standard tool usage and straightforward installation

Professional Applications & Engineering Value

This Grade G flange lock nut with distorted thread technology addresses critical vibration-induced loosening challenges in industrial machinery, construction equipment, and automotive assemblies. The zinc yellow-chromate plated steel construction provides exceptional corrosion resistance while maintaining the mechanical properties required for high-stress applications. The integrated 1 1/16" flange distributes clamping force effectively, reducing surface damage and eliminating the need for additional washers. Engineered with UNC coarse threading and Class 2B fit, this external hex flange nut ensures reliable performance in environments subject to thermal cycling, dynamic loads, and constant vibration, making it ideal for heavy equipment, structural frameworks, and industrial maintenance applications where fastener integrity is paramount.

Specification Summary & Compliance

This 1/2"-13 UNC flange lock nut features Class 2B thread fit per standard inch system requirements, with right-hand coarse threading and standard external hex drive compatibility. The product maintains dimensional accuracy with 1 1/16" flange diameter and 3/4" width across flats. Manufactured to Grade G strength classification and compliant with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental standards, ensuring regulatory compliance for industrial applications worldwide.