What does a tube cutter leave on the end of a tube that should be removed?

A tube cutter typically operates by scoring the tube and then applying pressure to break it cleanly. This process can result in the formation of a small burr on the cut edge of the tube. A burr is an unwanted, raised edge or small piece of material that remains after cutting. It can affect the fit and seal of joints and connections, making it necessary to remove.

Removing the burr is important in the fitting process, as it ensures a smooth and even surface for subsequent connections, minimizing the chances of leaks and other issues. This is particularly critical in applications involving plumbing or HVAC systems where precise fittings are essential for optimal functionality. By ensuring the burr is removed, one can create a better, cleaner joint, enhancing the integrity of the entire system.

The other options don't reflect the typical result of using a tube cutter. Cracks may occur due to improper handling or excessive force but are not a direct consequence of the tube cutting process itself. Pitting is generally related to corrosion rather than cutting, while metal shavings are associated with grinding or cutting processes that involve rotary tools, not tube cutters. Thus, the presence of a small burr is the most accurate and relevant outcome when using a tube cutter.