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The Tool Holder Can Be Divided Into Two Categories According To The Taper Hole Of The Spindle.

According to the taper of the tool hole on the spindle of the machining center, there are usually two main types:the taper of the tool hole on the spindle of the machining center and the taper of the tool hole on the spindle.

SK universal tool holder with taper of 7:24

2. HSK Vacuum Toolholder with taper of 1:10

SK universal tool holder with taper of 7:24

7:24 refers to the taper of the tool handle is 7:24, which is located on a single taper surface and has a longer taper handle. Cone surface plays two important roles at the same time, that is, the accurate positioning of the tool handle relative to the spindle and the clamping of the tool handle.

SK handle

Advantages: Without self-locking, the tool can be quickly loaded and unloaded; as long as the taper angle is machined to a high precision, the accuracy of the connection can be ensured, so the cost of the tool holder is relatively low.

Disadvantage: When spindle is rotated at high speed, the cone hole at the front end of spindle will expand. The expansion will increase with the increase of rotation radius and speed, and the rigidity of taper connection will decrease. Under the pull force of the tie rod, the axial displacement of the tool handle will also change. The radial dimension of the tool holder will change every time the tool is changed, and the problem of unstable repetitive positioning accuracy exists.

The universal tool holder with taper of 7:24 usually has five standards and specifications:

1. International Standard IS0 7388/1 (IV or IT for short)

2. Japanese standard MAS BT (abbreviated as BT)

3. German Standard DIN 2080 (NT or ST for short)

4. American Standard ANSI/ASME (abbreviated as CAT)

5. DIN 69871 (JT, DIN, DAT or DV for short)

Tension mode:

NT type tool holder is a kind of tool holder which is tightened by pull rod on traditional machine tool, also known as ST in China. The other four kinds of tool holders are tightened by pull nail at the end of tool holder on machining center.


1) At present, DIN 69871 (JT) and Japanese MAS BT tool holders are the most widely used tool holders in China.

2) The tool handle of DIN 69871 can also be installed on the machine tool of ANSI/ASME spindle taper hole.

3) IS0 7388/1 tool holder can also be installed on DIN 69871 and ANSI/ASME spindle taper hole machine tools, so IS0 7388/1 tool holder is the best in terms of versatility.

HSK vacuum tool holder with taper of 1:10

The elastic deformation of HSK vacuum tool holder depends on the tool holder, which not only contacts the 1:10 taper surface of the tool holder with the 1:10 taper surface of the spindle hole of the machine tool, but also makes the flange surface of the tool holder closely contact with the spindle surface. This double-sided contact system is superior to the general tool holder of 7:24 in high speed machining, connection rigidity and coincidence accuracy.

HSK Vacuum Tool Handle

HSK vacuum tool holder can improve the rigidity and stability of the system as well as the product accuracy in high-speed machining, and shorten the time of tool replacement. It plays an important role in high-speed machining. It can adapt to the spindle speed of machine tools up to 60,000 rpm. HSK tool system is widely used in aerospace, automobile, precision die and other manufacturing industries.

HSK tool holder has a variety of specifications, such as A, B, C, D, E and F. Among them, A, E and F are commonly used in machining centers (automatic tool change).

The biggest difference between Type A and Type E is:

1. Type A has drive grooves while Type E does not. Therefore, relatively speaking, the A-type transfer torque is larger, and some heavy cutting can be carried out relatively.  The E-type transmission of the torque is relatively small, can only carry out some light cutting.

2. In addition to the transmission groove, there are also manual fixed holes and direction grooves on the A-type tool handle, so the balance is relatively poor. The E-type is not, so the E-type is more suitable for high-speed machining. The mechanism of E-type and F-type is exactly the same. The difference between them is that the cone of E-type and F-type tool holders (e.g. E63 and F63) is smaller than that of F-type tool holders. That is to say, the flange diameters of E63 and F63 are both 63, but the cone size of F63 is only the same as that of E50. Therefore, compared with E63, the speed of F63 is faster (spindle bearings are smaller).

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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