What is the function of check nuts?

Check nuts are typically used in conjunction with regular nuts to prevent loosening due to vibrations and external forces. Their design allows them to be tightened against the primary nut, creating an additional frictional lock that helps maintain the integrity of the fastening in dynamic conditions. This is particularly crucial in mechanical applications where components may experience vibration or movement, as these forces can cause traditional hex nuts to gradually loosen over time. By employing check nuts, the fastening becomes more reliable and stable, ensuring that critical components remain securely fastened.

The roles of clevis bolts, plate nuts, and anchoring sliding parts, while important in their own contexts, do not pertain specifically to the primary function of check nuts. Therefore, the option highlighting their role in preventing loosening of non-locking hex nuts is the most accurate representation of their purpose.