This International Standard lays down the fitting dimensions for milling cutters mounted on centring arbors having a 7/24 taper, and the dimensions of centring arbors intended to facilitate centring of the cutter on the spindle nose. This International Standard applies both to cutters with inserted teeth, made from high speed steel or with brazed carbide tips, and to cutters equipped with indexable carbide tips. It concerns : — firstly, the so-called "single purpose mounting" milling cutter, arbor located, to be used with a well-defined spindle nose having a 7/24 taper. — secondly, the so-called "dual purpose mounting" milling cutter, arbor located, to be used with both spindle nose No. 50 and spindle nose No. 60 having a 7/24 taper. The general fitting dimensions are in accordance with ISO/R 297 and its addendum 1.