What is a 'Castellated Nut' primarily used for?

A Castellated Nut is primarily used as a fastening component, which allows it to secure bolts in various mechanical applications. Its design features a series of notches or cut-outs that allow a cotter pin or similar device to be inserted through the nut and bolt assembly. This pin prevents the nut from loosening due to vibrations or movement, ensuring a tight and secure fit. This locking mechanism is particularly important in applications where safety and reliability are critical, such as in aviation and military contexts.

The other options all pertain to components used in various mechanical or structural contexts, but they do not accurately describe the primary function of a Castellated Nut. For instance, securing lifting slings relates more to rigging components, while weight distribution and maintaining structural integrity involve different mechanical elements and engineering principles.