This part of ISO 5414 specifies the dimensions of tool chucks (end mill holders) with clamp screws for tools with flatted cylindrical shanks in accordance with ISO 3338-2. It also specifies the designations of these chucks. Two types of connection are defined: ? chucks with 7/24 taper shanks in accordance with ISO 297 for manual changers and with ISO 7388-1 for automatic changers, for tool shanks with either single flat or a double flat for manual and automatic changers; NOTE 1 This part of ISO 5414 specifies the dimensions of tool chucks with 7/24 taper shanks No. 30 for automatic changers although these are not standardized. ? chucks with Morse taper shanks in accordance with ISO 296 and ISO 5413 for tool shanks with a single flat only. NOTE 2 The dimensions of the driving system of the tool shanks are dealt with in ISO 5414-1.