This International Standard specifies the dimensions for interchangeability between the cutter and the arbor or mandrel, i.e. the diameter of the bore and the arbor or mandrel and elements of the drive, whether by keying or tenon. It applies to all types of milling cutters mounted on cutter arbors or mandrels. Two groups of tables have been established, relating respectively to the key drive and the tenon drive. Tables giving the conversion of the metric values into inches are given in annex A.