HSK-T is a new HSK system designed for turning on multi-task machines that are compatible with HSK-A type (ISO standard: ISO12164-1:2001). It was jointly developed by a consortium of Japanese manufacturers and is now used worldwide as the ICTM standard. The HSK-T type was registered in the ISO standard in 2008. (ISO12164-3:2008)
The HSK-T type has a closer tolerance between the spindle key and tool holder keyway than the HSK-A type. This results in higher cutting edge positional accuracy. For milling, the conventional HSK-A type tools can be still used.