This International Standard specifies the dimensions of shell end mills with plain bore and tenon drive intended for fitting to the ends of cutter arbors. It applies to metric series mills. It relates only to solid cutters, in steel. The dimensional features of this type of cutter either with solid steel inserted blades or with brazed tips or with indexable inserts will form the subject of further International Standards. The range of outside diameters of these cutters is taken from ISO 523.