An anti-loosening fastener, including a key-bolt-receiving bolt, including a head section to receive at least one tool thereon, a rear cylindrical section disposed on at least a portion of the head section to extend a predetermined distance away from the head section, the rear cylindrical section including a key-bolt-receiving aperture disposed within at least a portion of the rear cylindrical section to receive an external fastener therein, and an internal thread section circumferentially disposed on an inner surface within the key-bolt-receiving aperture, and a key bolt to removably connect to at least a portion of the key-bolt-receiving bolt.

A threaded shaft and retaining nut assembly having a shaft 4 with a first thread of a first hand along the shaft 4, and a second thread of a second hand opposite to said first hand along the shaft 4. The second thread at least partially overlaps said first thread. A tubular member is screwingly engageable for winding the shaft 4 into and out of the tubular member 3. A retaining nut 10 is screwingly engageable with the second thread for winding the retaining nut 10 back and forth along the shaft 4. In use, the second nut is engageable against an end of the tubular member 3 to prevent unintentional winding of said shaft. A locking member 12 is engageable with the tubular member 3 and the retaining nut 10 to effect a non-rotatable coupling between said tubular member 3 and retaining nut.

A threaded shaft and retaining nut assembly having a shaft 4 with a first thread of a first hand along the shaft 4, and a second thread of a second hand opposite to said first hand along the shaft 4. The second thread at least partially overlaps said first thread. A tubular member is screwingly engageable for winding the shaft 4 into and out of the tubular member 3. A retaining nut 10 is screwingly engageable with the second thread for winding the retaining nut 10 back and forth along the shaft 4. In use, the second nut is engageable against an end of the tubular member 3 to prevent unintentional winding of said shaft. A locking member 12 is engageable with the tubular member 3 and the retaining nut 10 to effect a non-rotatable coupling between said tubular member 3 and retaining nut.

An anti-vibration fastener, including a square flange bolt to affix a first object to a second object, the square flange bolt including a first threaded portion disposed at a front end of the square flange bolt, and a second threaded portion disposed at a rear end of the square flange bolt having a diameter smaller than a diameter of the first threaded portion, and a forward nut to encapsulate at least a portion of the square flange bolt such that the first object and the second object are disposed between the forward nut and the front end of the square flange bolt, and an aft nut to encapsulate at least a portion of the square flange bolt and the forward nut.

An anti-vibration fastener, including a square flange bolt to affix a first object to a second object, the square flange bolt including a first threaded portion disposed at a front end of the square flange bolt, and a second threaded portion disposed at a rear end of the square flange bolt having a diameter smaller than a diameter of the first threaded portion, and a forward nut to encapsulate at least a portion of the square flange bolt such that the first object and the second object are disposed between the forward nut and the front end of the square flange bolt, and an aft nut to encapsulate at least a portion of the square flange bolt and the forward nut.

A relative rotation prevention structure for preventing relative rotation of a screw having a threaded section with respect to a counterpart member, the relative rotation prevention structure being equipped with: a counterpart-side displacement section formed in advance on the counterpart member and capable of displacement in the axial direction or the radial direction; and a screw-side deformation-capable section that is formed on the screw and deforms when pressed into the counterpart-side deformation section by means of fastening force and, due to that deformation, produces a screw-side displacement section that is displaced in the axial direction or the radial direction.

An anti-vibration fastener, including a square flange bolt to affix a first object to a second object, the square flange bolt including a first threaded portion disposed at a front end of the square flange bolt, and a second threaded portion disposed at a rear end of the square flange bolt having a diameter smaller than a diameter of the first threaded portion, and a forward nut to encapsulate at least a portion of the square flange bolt such that the first object and the second object are disposed between the forward nut and the front end of the square flange bolt, and an aft nut to encapsulate at least a portion of the square flange bolt and the forward nut.

An anti-vibration fastener, including a square flange bolt to affix a first object to a second object, the square flange bolt including a first threaded portion disposed at a front end of the square flange bolt, and a second threaded portion disposed at a rear end of the square flange bolt having a diameter smaller than a diameter of the first threaded portion, and a forward nut to encapsulate at least a portion of the square flange bolt such that the first object and the second object are disposed between the forward nut and the front end of the square flange bolt, and an aft nut to encapsulate at least a portion of the square flange bolt and the forward nut.

Disclosed is a device for securing and adjusting a bearing in an orifice in a bridge or a plate of a timepiece. It includes a first bearing screw defining a crimping opening of such a bearing and including an external thread, a second screw, so-called locking screw, defining an internal bore and including an external thread and a socket defining a tubular housing extending following a longitudinal axis, the tubular housing including a first tapped section, adapted to screw the first screw, and a second tapped section, adapted to screw the second screw. Advantageously, the external threads of the first and second screws and the corresponding sections of the socket have respective screwing pitches in opposite directions. Also disclosed is a method for securing and adjusting a bearing in an orifice provided for that purpose in a bridge or a plate of a timepiece thanks to such a device.

Disclosed is a device for securing and adjusting a bearing in an orifice in a bridge or a plate of a timepiece. It includes a first bearing screw defining a crimping opening of such a bearing and including an external thread, a second screw, so-called locking screw, defining an internal bore and including an external thread and a socket defining a tubular housing extending following a longitudinal axis, the tubular housing including a first tapped section, adapted to screw the first screw, and a second tapped section, adapted to screw the second screw. Advantageously, the external threads of the first and second screws and the corresponding sections of the socket have respective screwing pitches in opposite directions. Also disclosed is a method for securing and adjusting a bearing in an orifice provided for that purpose in a bridge or a plate of a timepiece thanks to such a device.