In a protruding head rivet, how is the length measured?

In the context of a protruding head rivet, the length is measured from the bottom of the head to the end of the shank. This measurement is crucial because it determines how much of the rivet will be engaged in the materials being joined and ensures that there is sufficient rivet length to create a strong and effective joint.

Measuring from the bottom of the head to the end of the shank allows one to account for the entire length of the rivet that penetrates through the materials being riveted. This measurement is critical in applications where the fit and strength of the rivet joint are paramount, ensuring that the rivet is long enough to provide adequate mechanical bonding and support.

In contrast, other choices represent measurements that would not provide an accurate depiction of the rivet's length for its intended use. For example, measuring from the bottom of the head to the start of the shank would exclude part of the shank that is necessary for proper installation, while measuring from the top of the head involves areas of the rivet that do not contribute to its functional engagement with the materials. Lastly, measuring from the surface to the bottom of the head does not provide a complete picture of the shank length required for effective rivet application