Abstract: A bolt comprising a threaded shaft having at least one helical thread and at least one longitudinal groove, a nut having a tapped hole configured to be screwed onto the threaded shaft, and at least one diagonal slot which includes a first opening end and a second non-opening end. The diagonal slot is inclined from the first end towards the second end in the same direction as the helical thread of the threaded shaft. An anti-rotation device is configured to rotationally immobilize the nut with respect to the threaded shaft and comprises a ring which surrounds at least the threaded shaft and which has at least one first toe configured to be housed in the longitudinal groove of the threaded shaft and in the diagonal slot of the nut, in operation.

Abstract: A bearing system includes a bearing comprising a first end and a second end opposite to the first end. The bearing further comprises a plurality of threads adjacent to the second end. The plurality of threads comprise a first slot perpendicular to the plurality of threads. The bearing system also includes a washer comprising a first surface adjacent to the second end of the bearing and a plane parallel to the first surface. The washer further comprises a plurality of side tabs extending from a second surface in a direction parallel to the plane and a first tab extending from the first surface in a direction perpendicular to the plane. The first tab mates with the first slot of the bearing. The bearing system further comprises a nut positioned between the first end of the bearing and the first surface of the washer.

Abstract: A clip is fixed on a fixing object by inserting a male part into an insertion ending position of a female part. The female part has a receiving space for the male part and includes a base portion provided with an insertion hole communicating with the receiving space and an inserted portion for a through hole provided in the fixing object. Thus, at least a portion of the inserted portion is deflected or an elastic engaging portion formed in the inserted portion is prevented from being deflected inwardly to thereby be fixed on the fixing object. In the base portion of the female part, a display body which moves forward by inserting the male part into the insertion ending position so as to enable to be visually confirmed at a forward movement ending position, is provided.

Abstract: A support pin system (10) for fastening nuclear reactor guide tube flanges (14) to a nuclear reactor upper core plate (12) includes a support pin (16) having a lower portion (20) frictionally disposed within the upper core plate (12), while an upper section (24) is disposed within a through-bore (22) of the guide tube flange (14). The support pin (16) includes a threaded region (30) upon which is threadedly mounted a nut (32). In order to prevent retrograde rotation of the nut (32) relative to the support pin (16), a locking cap (46) is mounted upon the nut (32) and support pin (16) such that first crimped sections (48) are engaged within apertures (44) defined within the nut (32), while second crimped sections (54) are engaged within longitudinal grooves (50) defined upon the external surface of the support pin (16).