True or False: A rivet is a permanent mechanical fastener.

A rivet is classified as a permanent mechanical fastener due to its design and application. Once a rivet is installed, it is deformed by a tool to secure its position, creating a strong bond between the materials it is joining. This deformation typically prevents the rivet from being removed without cutting or damaging it, indicating its permanent nature.

Rivets are used in various applications, particularly in aerospace, where structural integrity is critical. They provide high shear strength and can join dissimilar materials effectively while maintaining a lightweight profile. The characteristic that makes rivets permanent is distinguishing for many assembly methods, setting them apart from other fasteners like screws or bolts, which can be removed and reused.

Although rivets can be used with different materials, such as aluminum or steel, this does not change their status as permanent fasteners. Therefore, the answer that identifies rivets as a permanent mechanical fastening solution aligns with their fundamental properties and typical usage in assembly applications.