The pitch of the screw refers to the distance traveled by the spindle in one complete rotation. It is usually provided by the manufacturer and is expressed in millimeters (mm) or fractions of a millimeter.
For example, let’s say the pitch of the screw is 1 mm and the number of divisions on the circular scale is 100. Plugging these values into the formula:
Least Count = 1 mm / 100 = 0.01 mm
Therefore, the least count of this screw gauge would be 0.01 mm.