What is the length from the tip of the shuttle to the surface of the vertical part called?

The length from the tip of the shuttle to the surface of the vertical part is referred to as the "shuttle length." This term specifically describes the measurement involved when dealing with machinery that uses shuttles, which typically engage in horizontal movement to position or retrieve items. Understanding this definition is critical in the operation of equipment in a warehouse or storage environment, where precise measurements are necessary for effective loading and unloading.

The other options do not accurately describe this specific measurement. For instance, fork length typically refers to the length of the forks on a forklift, which is relevant for determining the type of loads that can be lifted but does not pertain to the shuttle's positioning. Reach length generally refers to the horizontal distance that a lift can extend outward, while lift height indicates how high a forklift can elevate its forks. Thus, the term "shuttle length" is the most suitable choice for this particular measurement in the context of the question.