Abstract: A tightening tool which includes a driving part forming a grip of a handle of the tool and a driven part which includes a blade holder and is a complementary distal part of the handle. These two parts have, in a first position of use, a common axis of rotation, a device for allowing tilting the driving part with respect to the driven part. The tilting device includes at least one transverse spindle which is integral with one of the two parts and is able to move in a longitudinal slot of the other part. The slot is equipped with a stop. Also, a locking arrangement can adopt a position for positive locking of the driving part in a position which is coaxial with the driven part. The locking arrangement forms a plug and socket type connection between the two parts. The parts additionally have a position for allowing the tilting of the driving part. The tilting position is obtained by relative coaxial displacement of the two parts to a predetermined position of separation.