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BT Tool Holders

BT Tool Holders
BT Tool Holders


 Taper D D1 D2 L D5 g T5 B T3 L4
 30 46 38 31.75 48.4 12.5 M12 16.3 16.1 2 13.6
 40 63 53 44.45 65.4 17 M16 2.6 16.1 2 16.6
 50 100 85 69.85 101.8 25 M24 35.4 25.7 3 23.2






BT Tool Holders



BT Tool Holders


 Taper d9 e1 e2
 40 4 27 5
 50 6 42 7



All tool holders are manufactured according to DIN norms (these DIN norms provide the same classes of tolerance for the attachment DIN 2080,DIN 69871A/B,MAS BT)


According to the class AT3


The norm DIN 6391 permit a run out error between external cone and internal cone / colletseat of 0.016.Our collet chucks have a run out accuracy which is largely below the requested one.


Our Shell end mill adaptors meet the requirements of the norms DIN 6385,which prescribes for O 16,22,27,32 a run out accuracy of: 0.01 for BT 30/40 0.015 for BT 50

Our Holders have a Run out accuracy which is largely below the requested one.



According to the Norm DIN 6359-1 end mill holders have to meet the following requirements bore: H5/H6
Runout Accuracy:<0.01
Our end mill holders ensure the prescribed hole's tolerance and have a run out accuracy which is largely below the requested one(normally 0.005)


BT Tool Holders
BT tooling is symmetrical in regards to the spindle axis, which CAT tooling isn't. This provides BT tooling balance and greater equilibrium at high rates. BT Tooling seems quite similar and may readily be confounded with CAT tooling. The difference between BT and CAT is the flange design, depth, as well as the screw thread for the pull stud is not the same size. BT Tool Holders use Metrical screw thread pull studs (retention knobs).
There are just two kinds of tools in CNC machines: cutting tools and tool holders. There are several other things associated with tool holders, including wrenches, set screws, collets and other set up tools. Tools for CNC machines come in few distinct standards and are produced by many different brands.

BT standard for tool holders is much like CAT tool holders and originated in Japan.

If to compare BT to CAT tool holders – they can be readily confounded and appear quite similar, yet, they have distinct flange system and its own depth differs as well. In addition, the retention knobs are very different. CAT tool holders and so BT aren't interchangeable. Though both standards make use of the same NMTB body taper. That makes BT tool holders much more secure at higher speeds and when balanced.

BT tool holders together with HSK and CAT standards are one of the most used tool holders in CNC machines. They are best option for really high speed machines and are permanent. BT tools enable to utilize ATC (Automatic Tool Change) technology to optimize the speed and productivity of production. Make sure you keep them safely with no opportunity for the tool being damaged as this might cause some equilibrium which can be crucial at high rates and precise CNC machines – though tool holders perform work with high tensions and pressures.

What is "BT" series holder ?

The BT series holders are as per standard (BT MAS 403) DIN ISO 7388 – 2.
In BT series holders, only taper comes in machine spindle contact. There is some gap between the spindle face and the tool holder face.


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