Which part of the Hi-Lok is permanently installed during the fastener installation?

The collar is the part of the Hi-Lok that is permanently installed during the fastener installation. The Hi-Lok fastener consists of a pin and a collar that work together to secure components. When the collar is installed, it is swaged onto the pin, which locks them together in place. This connection becomes permanent, as the collar is designed to deform and create a tight grip around the pin, ensuring a robust and reliable fastening system.

Understanding the role of the collar is crucial for assembly mechanics, as it provides the necessary strength and stability for aircraft structures. The pin serves as a removable component, allowing for replacement if necessary, while the collar remains fixed after installation, emphasizing its role as a critical element in the fastening mechanism.