This durable 5/8" SQ Locknut, manufactured by MacLean Senior Industries, is engineered for reliable performance in various aerial hardware applications. Its unique concave design allows for secure locking by simply turning it with a wrench, thereby deflecting the threads of the nut against the bearing surface for a tight fit. The locknut has been designed for ease of use, spinning freely from either side and threading into place by hand without the need for a special wrench. Further enhancing its utility, this locknut is available in improved corrosion-resistant options, including a TDG coating for enhanced durability. Recognized as RUS approved, it is a trusted choice among professionals seeking reliable components for their projects. This industrial-grade locknut exemplifies MacLean Senior Industries' commitment to quality and efficiency in aerial line hardware solutions.