What is the primary function of the head on a lockbolt?

The primary function of the head on a lockbolt is to apply pressure to one side of the materials being fastened. When a lockbolt is installed, its head is designed to firmly grip one of the materials, creating a secure connection. This pressure ensures that the materials are held together tightly, which is crucial in applications where vibration or movement can occur, such as in aerospace assemblies. The effectiveness of the lockbolt relies significantly on this pressure, as it helps maintain the structural integrity of the joint and prevents loosening over time.

In contrast, options regarding connection and removal do not capture the specific function of the head. Although the lockbolt does connect materials, that is more about the overall purpose of the lockbolt rather than the specific role of the head. Similarly, while lockbolts can sometimes be removed, the head's primary role is not related to facilitating removal. Lastly, being decorative does not align with the functional requirements of aerospace components, where performance and reliability are paramount.