The Dimension of components in technical drawings is one of the most fundamental elements of technical drawing, because only through the registration of the measurements are reproducible components. The basic rules for the Dimensioning of technical drawings are in DIN DIN 406-10 and 406-11 described.
With the dimensions you describe the dimensions - in other words, length, height, diameter, etc. - and the shape of components. The measure consists of the dimension line (describes the dimensions), the measure (the size of Dimension to - usually in 'mm'), the Maßhilfslinie (leads from the dimensioned drawing element to this dimension line and limited) and the Maßpfeilen (show the endpoints to the dimension line).
As already mentioned the measure in the 'm' is given. The unit will not have written so far as the claim in Millimenter done.
An example of a workpiece dimensions in a technical drawing you see in the chart below. They are also the individual elements of the dimension marked.
The example above is very simple. It shows, however, besides the dimensions of the component length and the dimension of a bore. There are drawings for the various elements (holes, radii, threads, chamfers, etc.), specific rules need to be considered. As technical drawings of complex components and assemblies are very extensive, there is also another dimension methods, which make the drawing clearer. On the subject of standard fair Dim learn even more in the Basic Guide III.