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BBT Tool Holders

BBT Tool Holders
BBT Tool Holders


 ISO d D D1 a b G L1 L2 L3 L4 L5 L6
 30 12.5 31.75 46 1 16.1 M12 48.4 21 20 24 7.0 16.3
 40 17 44.45 63 1 16.1 M16 65.4 27 26 32 9.0 22.6
 50 25 69.85 100 1.5 25.7 M24 101.8 38 36.5 47 13.0 35.4




"BBT" Tool Holder Provides More "Rigid" Clamping than the Standard "BT" Tool Holders.

Achieves Higher "Radial Rigidity".

Improves Tool Life.

Balanced to 2.5G, 25000 RPM.

Material :- Case hardened steel, tensile strength in the core min. 950 N/mm² 

Execution :-Case hardened to HRC 58 ± 2. Case Depth 0.8mm., Silver finish.

Accuracy :- 7:24 Taper Angle Class AT 3 As per DIN 2080

BBT Tool Holders

In BBT Tool Holder as mentioned Taper and both faces are in Contact, due to which spindle and holder acts as one single unit, this allows a Higher "Radial Rigidity" hence we get good surface finish and dimensional accuracy while machining, also low vibration at higher speeds which increases Tool Life. Hence BBT Tool Holder has a remarkable significant as compared to Standard Tool Holders.



BBT Tool Holders are only recommended to use in Calibrated BBT Spindle Machines.

What is "BBT" series holder ?

BBT series holders are as per standard BT MAS 403.
These are taper and face contact holders. As spindle taper, spindle face and tool holder taper and face both comes in contact, the machine spindle and holder acts as one single unit. This allows higher radial rigidity and accuracy and we get good run-out on tool.

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