What is the term for the end of a circular saw shaft where the blade is mounted?

The term for the end of a circular saw shaft where the blade is mounted is the arbor. The arbor serves as a mounting point for the saw blade, allowing it to spin efficiently during operation. This part is crucial because it provides the necessary connection that ensures the blade stays securely in place while the saw is in use. A properly functioning arbor is vital for the safety and performance of the saw because if the blade is not tightly attached or if the arbor is worn out, it can lead to blade wobble or even a dangerous situation.

Understanding the different components of a circular saw and their specific functions is important for anyone operating power tools, as it helps in maintaining and using the tools safely and effectively. The other options, while related to saw operation, refer to different aspects or components and do not accurately describe the specific part where the blade is mounted. For instance, the hub typically refers to the center part of the blade itself, while the spindle refers to the entire shaft of the saw, and the blade is the cutting component.