This part of ISO 3937 specifies the dimensions of cutter arbors with tenon drive and with hollow taper interface with flange contact surface (HSK). It also specifies the dimensions of cutter arbors with tenon drive and enlarged contact surface of the cutters. The interchangeability dimensions of the milling cutter bearing on the cutter arbor are in conformity with ISO 2780. The dimensions of the retaining screw used are specified in ISO 2780. The hollow taper interface with flange contact surface is in conformance with ISO 12164-1.