When installing the collar onto the Hi-Lok, which part of the fastener does the collar cover?

The collar of a Hi-Lok fastener is designed to cover the threaded tail end of the fastener. The purpose of the collar is to ensure proper engagement and locking of the fastener when installed. When the collar is tightened onto the threaded tail, it compresses the fastener and securely fastens the assembly.

This design allows for the uniform distribution of load and ensures that the fastener remains securely in place under the operating conditions it will face. The interaction between the collar and the tail end is critical for maintaining structural integrity in aerospace applications, where reliability is paramount.

Understanding this specific relationship helps mechanics ensure that Hi-Lok fasteners are installed correctly and meet the required performance specifications.