Clinch

The clinch of any variety consists of two parts - from the head and the cylindrical tail. After installation, the tail is flattened - and the clinch as a result is firmly held, and the head and tail. The principle is so obvious that the clinch is perhaps the oldest kind of fasteners. And since ancient times to this day is famous for its reliability. Clinch can be seen in the cases of ancient wooden ships, and in the details of the most modern aircraft.