When are lock nuts typically used?

Lock nuts are specifically designed to secure bolts in place and prevent them from loosening under various conditions, such as vibrations or changes in temperature. The unique design of lock nuts, which may include features like nylon inserts, serrated surfaces, or deformable shapes, creates additional friction or mechanical interlock when tightened against a corresponding bolt. This helps to maintain a stable and secure connection in applications where safety and reliability are critical, such as in machinery, vehicles, and structural assemblies. By addressing these needs, lock nuts play a vital role in ensuring the integrity of mechanical systems over time, especially in dynamic environments.

In contrast to other options, lock nuts are not primarily aimed at simplifying installation; their function does not involve increasing weight; and aesthetic appeal is not a consideration in their design or purpose. Instead, their main focus is on preventing the inadvertent loosening of fasteners, thereby enhancing the overall durability and performance of the application in which they are used.