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Shandong Jining Qingfeng Machinery Hardware Co.,Ltd

Add: NO.47 Jinyu Road, Jining, Shandong

Contact: Qin Wang

Tel: +86-537-3281595

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What's the difference between tool handle BT and JT

Most JT shanks have internal cooling channels to support cooling in the center of the spindle or (and) in the end of the spindle. The main structure is shown in the figure below. The BT handle is a Japanese standard. The shoulder size is larger than JT, so the knife weight is increased. The 180 degree circumference has positioning, and there is no positioning gap unfavorable to dynamic balance. Most of the BT shanks do not have internal cooling channels, and some can provide BT shanks with internal cooling channels. However, due to the thinner neck of the BT shank (especially BT40 and below), increasing the cooling channels in the center may lead to the risk that the broach shank will break off. The main structure is shown in the figure below. There is little difference in principle. However, the actual use must be distinguished, and no mistake can be made.

BT machine tool can not use JT tool holder, JT machine tool can not use BT tool holder. Most of the European machine tool standards are configured in JT class, such as DIN69871. Most JTs in Europe can choose either with central inner cooling or spindle end-face inner cooling. Most standard configurations of machine tools in Japan, Korea and Taiwan are BT. The BT handle may not have internal cooling due to the thinner neck of the pull nail. Because if the pull nail is added with internal cooling holes, the cross-section area may be too small and the strength will be insufficient.


Contact Us
Shandong Jining Qingfeng Machinery Hardware Co.,Ltd

Address: NO.47 Jinyu Road, Jining, Shandong

Tel: +86-537-3281595

Fax: +86-537-3281597

E-mail: info@qfmh.com

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