The invention relates to a surgical tool (1) for cutting a helical groove in a bone with a body (2) receiving at least a portion of a drive shaft (9) and a tool part (3) held on same comprising a functional element (5) that produces the groove in the bone by oscillating. The tool part (3) comprises a projecting, rotatable shaft (4) at whose end opposite the body (2) the pin (5) constituting the functional element extends through an aperture (8) out of the shaft (4) that, in order to remove material of the bone, can oscillate longitudinally. The shaft (4) is coupled in such a way with the drive shaft (9) that the latter exerts torque on the shaft (4) and the pin (5) at least indirectly, at least one wing (6) projecting radially from the shaft (4) that extends at a spacing beginning behind the pin (5) in the peripheral direction of the shaft (4) helically in the direction of the body (2). The drive shaft (9) has an eccentric pin (11) projecting from its front-side end that is in engagement with a vibratory shaft (7) extending through the shaft (4), the pin (5) being firmly held on the vibratory shaft (7).