BT shanks are one of the most common tooling systems used. It is the 7/24 taper from Japan. It is available in both Centre through coolant – Form JD (AD) and flange through coolant – Form JD/JF (AD/B) It is the first instance of the 7/24 taper available with automatic tool changer (ATC) BT tool holders use metric pull studs (retention knobs). JPAC Precizions offers BT tool holders in sizes BT30, BT40, BT50 and even offers BT15 taper tool holders on request. All BT tool holders made by JPAC  conform with AT3 class tolerance and are case hardened.