ISO International Standard

This second edition cancels and replaces the first edition (ISO 297 : 1982) and ISO 2583 : 1972. Specifies the dimensions, in millimetres, of 7/24 tapers for spindle noses and tool shanks. It also specifies the external diameters of the collars for these tool shanks, and the positioning of the front face of the collars with respect to the taper.