What's the difference between hilt BT and JT

November 11, 2019

Most JT tool holders have internal cooling channels to support cooling in the spindle center or (and) the spindle end face. The main structure is shown in the figure below BT handle is a Japanese standard, the shoulder size is larger than JT, so the blade weight is increased, there is positioning around 180 degrees, and there is no positioning gap adverse to dynamic balance. Most of the BT tool holder do not have internal cooling channels, and some can provide BT tool holder with internal cooling channels. However, due to the thin neck of the pulling pin of BT handle (especially BT40 and below), increasing the internal cooling channel in the center may lead to the risk of the pulling pin being broken and the handle falling off. The main structure is shown in the figure below There is little difference in principle. But the actual use must be distinguished and cannot be mistaken.
BT machine tool can not use JT tool holder, JT machine tool can not use BT tool handle Most European machine tools are equipped with JT standard, such as din69871. Most JTS in Europe can choose to have central internal cooling or spindle end internal cooling Most of the standard configuration of machine tools in Japan, South Korea and Taiwan is BT. BT handle may be due to the thin neck of the rivet, most of which do not have internal cooling. Because the cross-sectional area of the rivet may be too small and the strength may not be enough if the internal cooling hole is added.

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