Wrench (1) for providing a maximum torque to an external part, characterised in that it comprises at least one elongated metal part (3) provided with a fixed end (4) and a pusher end (5), and which also comprises a torque-applying head (6) upon which the pusher end (5) acts, wherein the elongated metal part (3) is capable of bending when a torque is applied with the wrench, and wherein the elongated metal part (3) reaches a maximum bending point that determines the maximum torque provided by the wrench (1). The inventive wrench (1) is easier to use than conventional spring-based wrenches as the force required to adjust the torque is minimal and independent of the torque value to which the wrench is adjusted. It is also capable of providing higher torque values.

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