What does the dimension 1.8 + .03 indicate?

The dimension 1.8 + .03 indicates the nominal size, which is the intended measurement of an object or part, along with its allowable variations or tolerances. The nominal size, in this case, is 1.8 units, and the "+ .03" signifies the permissible deviation, meaning that the actual size can vary from 1.8 up to 1.83 units. This is common in engineering and manufacturing, where precise dimensions are crucial, and variations are accounted for to ensure that parts fit together correctly and function as intended. Understanding dimensions like this is essential for quality control and for ensuring that manufactured products meet specified design criteria.