For case hardened or carbonitrided components applies:- Component sections that vary with referenceto the surface hardness stated under , are markedwith a minimum hardness statement in the drawing.- At all other locations without markings, a minimum value of 610 HV 1 (for sintered steels minimum value 500 HV 1) must be met- At areas inaccessible to heat treatment such as bores, deviations from the required minimum value of 610 HV 1 (for sintered steels minimum value of 500 HV 1) are accepted if no other information is provided.