FIELD: manual machines for rotary clamping of percussion and(or) drilling tools. SUBSTANCE: in stem 11 of tool and in chuck 10 at least three rotary carriers are mounted. Rotary carriers have recesses 17,18,22 axially terminating near end portion of stem and rotary carrier dents 19,20,23 of chuck passing in said recesses. Axial locking is in the form of axial groove 21 closed at end portion of tool stem 11 and locking member 16 of chuck 10 entering said groove. Two rotary carriers are arranged at least partially one opposite to another. In order to provide uniform torque load of tool stem 11 and chuck 10, rotary carriers are arranged one after another along circumference of stem (according to axial locking) and they have their lateral surfaces placed by inscribed angle 180 -240 degrees. EFFECT: enhanced centering of stem in chuck preventing single-side wear of tool. 14 cl, 7 dwg
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