Which rivet accurately fits the conical depression made by a 100° countersink?

The conical depression made by a 100° countersink is specifically designed to accommodate rivets that have a matching head angle. In this case, a rivet that fits a 100° countersink will have a head that is also shaped to match this angle, allowing it to sit perfectly flush when installed.

Each type of rivet has a specific design, with certain angles associated with their heads. Rivet options that correspond to a different countersink angle would not fit properly into a 100° countersink, potentially compromising the integrity of the joint or causing an improper installation.

Choosing a rivet that fits the 100° countersink ensures a secure and flush installation, which is essential for maintaining the aerodynamic integrity and strength of the assembly. Thus, rivet choice is critical in achieving the desired fit and function in sheet metal structures.