ISO 5414-2 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.
ISO 5414-2 defines two types of connection:
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;
chucks with Morse taper shanks in accordance with ISO 296 and ISO 5413 for tool shanks with a single flat only.