What is the primary function of an adjustable spanner?

The primary function of an adjustable spanner, often referred to as an adjustable crescent wrench, is to serve as a versatile tool that performs the general work of a spanner. It is designed with a movable jaw that allows the width of the opening to be adjusted, enabling it to grasp nuts and bolts of various sizes. This flexibility makes it useful in a wide range of applications, from automotive repairs to plumbing work, without the need for a full set of wrenches for different sizes.

The adjustable feature is particularly advantageous because it allows for quick changes in size, making it convenient for tasks that might require loosening or tightening several fasteners of different dimensions. In contrast, a fixed-size spanner can only accommodate one specific size of nut or bolt. This characteristic of the adjustable spanner enhances its utility in mechanical work and repairs, making it a staple tool in many toolboxes.

The other options mentioned do not relate to the primary function of an adjustable spanner. Providing a fixed torque is more closely associated with torque wrenches, measuring fluid levels relates to dipsticks or liquid gauges, and cutting through heavy metal pertains to cutting tools such as saws or grinders. Thus, the primary purpose of the adjustable spanner as a versatile tool