The new worldwide standardization resulted in the vast majority of OEMs using the metric system to classify cylinder head prints as well as other engine components. .01mm and .001mm are therefore widely used to tolerance various valve guide and valve seat machining limits.

The above drawing will allow each and everyone to visualize well-known differences between various reference values.

It is well known that using thousandths of millimeters in tolerances implies new control means and new reflexes in selections and machining options.

NEWEN has opted to equip itself with control means with a definition of one hundredth of a micron (0.00001mm) to check the performance level of its machines and provide a guarantee to its customers in their essential choices while selecting machining equipment.