A non-magnetic locking sleeve includes an engagement unit disposed in a body which includes a locking socket and a positioning groove. The locking socket is enclosed by a plurality of peripheral walls connected one after another for holding a fastener. The positioning groove is annularly recessed into the peripheral walls for receiving the engagement unit. Preferably, an intersection of two adjacent peripheral walls forms a recessed portion whereby the fastener is held by the peripheral walls more tightly while inserting into the locking socket. A periphery of the engagement unit can be formed with a rough surface or at least one engaging surface to increase a contact area between the engagement unit and the fastener. Accordingly, the fastener is firmly positioned by the locking sleeve to increase the stability of a following fastening operation executed by the fastener.

A non-magnetic locking sleeve includes an engagement unit disposed in a body which includes a locking socket and a positioning groove. The locking socket is enclosed by a plurality of peripheral walls connected one after another for holding a fastener. The positioning groove is annularly recessed into the peripheral walls for receiving the engagement unit. Preferably, an intersection of two adjacent peripheral walls forms a recessed portion whereby the fastener is held by the peripheral walls more tightly while inserting into the locking socket. A periphery of the engagement unit can be formed with a rough surface or at least one engaging surface to increase a contact area between the engagement unit and the fastener. Accordingly, the fastener is firmly positioned by the locking sleeve to increase the stability of a following fastening operation executed by the fastener.

A tool for insertion and extraction of temporary fasteners that enables by a plurality of retractable elements, an automatic engagement of the tool on the head of the temporary fastener, without the need for any rotation of the tool with regard to the head, and by lockable grasping units, operated internally locking elements, a high retention and extraction force is achieved, favouring the elimination of the risk of the clamp detaching itself from the tool, enabling control of the entire insertion and extraction process of temporary fasteners. Rapid, effective automation of the use and procedure of the temporary fasteners can be achieved, improving economic profitability and the reliability of their use.

A socket for rotatably fastening or unfastening a jackbolt of a multi jackbolt tensioner the socket extending between a first end and a second end such that the first end is adapted to receive the jackbolt, the socket comprising: a passage extending along a length of the socket to receive a head of the jackbolt, the passage being defined by a plurality of even-numbered internal side walls dimensioned to engage a plurality of sides of the head of the jackbolt received therein, the socket having a central axis with diametrically opposed pairs of said side walls being parallel to each other, and pairs of adjacent side walls meeting to form corner portions to receive corners of the jackbolt head; a plurality of guiding members arranged circumferentially about an opening of the passage to guide the head of the jackbolt into the passage and align the plurality of sides of the head of jackbolt such that corners of the jackbolt head are aligned into position with corner portions of said pairs of adjacent side walls.

A socket for rotatably fastening or unfastening a jackbolt of a multi jackbolt tensioner the socket extending between a first end and a second end such that the first end is adapted to receive the jackbolt, the socket comprising: a passage extending along a length of the socket to receive a head of the jackbolt, the passage being defined by a plurality of even-numbered internal side walls dimensioned to engage a plurality of sides of the head of the jackbolt received therein, the socket having a central axis with diametrically opposed pairs of said side walls being parallel to each other, and pairs of adjacent side walls meeting to form corner portions to receive corners of the jackbolt head; a plurality of guiding members arranged circumferentially about an opening of the passage to guide the head of the jackbolt into the passage and align the plurality of sides of the head of jackbolt such that corners of the jackbolt head are aligned into position with corner portions of said pairs of adjacent side walls.

A universal socket structure includes a female seat, a joint member, at least one engaging member, and an elastic member. A coupling end the female seat is recessed to form an accommodating trough. Two opposite sides of the accommodating trough are formed with grooves extending along an axial direction of the female seat. The female seat has at least one coupling portion. The joint member has one end formed with a spherical head. Two opposite sides of the spherical head has protrusions protruding from an outer periphery of the spherical head. The spherical head is accommodated in the accommodating trough. The protrusions are accommodated in the grooves. The engaging member is disposed in the coupling portion and movable from the coupling portion toward the accommodating trough. The elastic member is disposed in the accommodating trough for pushing and supporting the spherical head to engage with the engaging member.

A socket adapter for limiting torque delivered from a tool to a socket piece. The socket adapter includes a female receiver that is coupleable to and driven by the tool, and a male drive that is coupled to and driven by the female receiver for transferring torque to the socket piece. The socket adapter further includes a clutch mechanism having a first clutch surface, a second clutch surface that engages the first clutch surface, and an adjustment mechanism for adjusting a clamping force between the first clutch surface and the second clutch surface. The second clutch surface slides relative to the first clutch surface when a reaction torque exerted on the clutch mechanism exceeds a predetermined torque limit.

A socket adapter for limiting torque delivered from a tool to a socket piece. The socket adapter includes a female receiver that is coupleable to and driven by the tool, and a male drive that is coupled to and driven by the female receiver for transferring torque to the socket piece. The socket adapter further includes a clutch mechanism having a first clutch surface, a second clutch surface that engages the first clutch surface, and an adjustment mechanism for adjusting a clamping force between the first clutch surface and the second clutch surface. The second clutch surface slides relative to the first clutch surface when a reaction torque exerted on the clutch mechanism exceeds a predetermined torque limit.

A detachment-preventive adaptor socket includes a drive portion having an end face that is formed with an axially inward recessed drive hole having multiple axially-extending sidewalls, of which at least two opposite sidewalls are each formed with a radially-recessed detachment-prevention groove, the end face of the drive portion being also formed with a first guide slope that is axially inward recessed and extended as an inclination arranged in an annular form that is connected to the end face of the drive portion and has an outside diameter greater than a diameter of the drive hole, a second guide slop being arranged between each sidewall of the drive hole and the first guide slope and directly adjacent to the first guide slope; and an operation portion, which is axially connected with the drive portion and has an end face that is axially recessed to form an operation hole.

A detachment-preventive adaptor socket includes a drive portion having an end face that is formed with an axially inward recessed drive hole having multiple axially-extending sidewalls, of which at least two opposite sidewalls are each formed with a radially-recessed detachment-prevention groove, the end face of the drive portion being also formed with a first guide slope that is axially inward recessed and extended as an inclination arranged in an annular form that is connected to the end face of the drive portion and has an outside diameter greater than a diameter of the drive hole, a second guide slop being arranged between each sidewall of the drive hole and the first guide slope and directly adjacent to the first guide slope; and an operation portion, which is axially connected with the drive portion and has an end face that is axially recessed to form an operation hole.