The invention relates to a device (D) for protecting a male end (EM) of a component (T) of a tubular threaded joint for boring and using hydrocarbon wells, said male end (EM) being provided with at least one thread (FE1) on the outside and comprising a free terminal end (P1). The device according to the invention (D) comprises: i) a protective body (CP) embodied as a first sleeve and used to protect at least part of the external thread (FE1) and the free terminal part (P1); ii) a sealing element (EE) which can be brought into contact with the component (T), at least in a part arranged downstream of the outer thread (FE1) of the male end (EM), and also with the protective body (CP) in order to ensure a first tightness downstream of the end thread (FE1); and iii) fixing means (MF) used to displace the sealing element (EE) and/or the protective body (CP) radially towards the component (T), defining so-called "open" and "closed" positions of the device (D) in which the sealing element (EE) and/or the protective body (CP) are respectively not in contact with the component and in tight contact with the component (T). Furthermore, the first tightness is obtained when the device (D) is in a closed position.