Marking a precision machined product for identification or other purposes requires only that the location, size and depth of the marks be specified.
It is also necessary to specify the style of marking required and add, in a note, if subsequent grinding or plating will be done. Grinding or plating will change the appearance and dimensioning of the markings. See Figure 1.
Also, roll marking, as shown in Figure 1 may make a track or starting mark on the cylinder as the stamp roll begins to engage the part. Whether these marks must be removed or can remain should be covered in a note on the drawing.
Pieces produced from other bar stock shapes can be marked axially as shown in Figure 2. Only one marking per piece is possible.
When hexagon or square flats on a piece require marking, it is often done by special equipment before the bars are machined. Bars are sometimes continuously marked their full length. Components produced from these bars will often contain a complete as well as partial marks. The number of characters to show per piece should be specified. An example is shown in Figure 2.