A dovetail track groove bolt includes a T-shaped body having a bolt head and bolt shaft. The bolt head has inclined limiting surfaces on both sides, and its longitudinal cross-section forms a dovetail shape. The width of the bolt head is equipped with installation surfaces on both sides, and at the diagonal junction of the limiting surfaces and installation surfaces, avoidance surfaces are placed. This irregular bolt, through the implementation of a dovetail-shaped bolt head matching the dovetail track groove, redistributes the vertical gravitational force into horizontal and longitudinal forces, effectively dispersing the track groove's bearing load and enhancing the overall bearing capacity. Simultaneously, by introducing installation surfaces and avoidance surfaces, the bolt head can be inserted directly into the dovetail track groove's slot and aligned through rotation, thereby expediting the installation process.

Provided herein is a security mounting bracket device that can be used to securely connect a crossbar to a mounted object. The device is shaped to form a contoured fit with the crossbar and adapted for use with a security nut and bolt rendering both nut and bolt unexposed outside of the device and inaccessible to tools that may be used to forcibly remove the mounted object. The security mounting bracket device can be used as an antitheft device as a security socket is required to remove the nut from the security mounting bracket. The contoured fit reduces the movement of the crossbar within the security mounting bracket device therefore reducing vibrationally induced failure of the mount and loss of mounted object. The security mounting bracket device smooth edges and unexposed nut and bolt also make it a safer bracket for the user in assembly. The size and contour of the security mounting bracket device can be customized to connect any shape of a crossbar to a mounted object such as a guide rail attached to a platform or to a platform directly. The crossbar can be mounted perpendicularly or at other angles, to the security mounting bracket device or and can be used to connect a plurality of mounted objects for example platforms for tents or cargo containers.

A tool adapted for use with a bone plate assembly includes a driver with an engagement portion configured to engage a locking element, and a tubular holder. The driver may be configured to extend with the engagement portion through the tubular holder, and may be axially movable and rotatable within the holder. The holder may have a radial slot adapted for insertion of the locking element. The holder may include a portion with an internal thread for cooperation with an external thread of the locking element. The locking element may be used with a polyaxial bone anchor.

A system and method for securing an item. Custom connectors which only couple to a custom converter can secure an item, deter its theft, and prevent unauthorized access. The custom connectors have a custom head which has a custom void. The custom void has a unique shape which matches and couples with a custom converter. A custom converter allows the custom connector to be manipulated. If desired, subsequently, when the item is in a more secure location, conventional screws can replace the item.

A socket includes a housing having a first end dimensioned and configured for cooperation with an associated wrench and a second end dimensioned and configured for engagement with a locknut. The second end includes a first plurality of magnets disposed to maintain a single locknut against the second end, the second end and a second plurality of magnets disposed to maintain the second end against an associated housing with the associated locknut disposed intermediate the second end of the socket and the associated housing. The second end of the socket including a plurality of depending feet dimensioned and configured for meshing engagement with the locknut whereby rotation of the socket causes rotation of the locknut when the locknut is engaged with an associated externally threaded connector to move the locknut axially along the external threads of the externally threaded connector.

A locking element is configured to be used with a polyaxial bone anchor, and is substantially cylindrical with a bottom side facing a head of the bone anchor, a top side opposite to the bottom side, and a surface portion with an external thread. The locking element has a first recess at the bottom side for accommodating at least a portion of the head, and a second recess at the top side for engagement with a driver. The second recess is located outside the center of the top side. The head has a portion with a largest diameter, and a first level L1 is defined by the highest point of a circle with the largest diameter drawn around the head, and a second level L2 is defined by the bottom of the second recess, L2 being at a level not higher than L1.

A torque enhancing device that includes a torque contact body having one or more torque driver and/or recessed recipient torque contact surface configurations, inclusive of those in a multi-tier arrangement. The body having a Z-axis depth or thickness, and each of the torque contact surface configurations includes a pair of X-axis extending torque contact side walls that are spaced apart by L1 along a Y-axis, and a pair of Y-axis extending torque contact side walls that are spaced apart by L2 along the X-axis, with at least one of the one or more torque contact surface configurations having four concave contoured surface portions positioned between respective adjacent most ends of the X-axis extending torque contact side walls and the Y-axis extending torque contact side walls, and a length ratio L2/L1 is less than 1 as to provide a torque enhancement contact surface configuration. A method of driving such as insertion or removal of the recessed recipient such as in fastener form is included.

A torque enhancement device having torque enhancement member(s) with each having an exterior (preferably bi-symmetric or essentially bi-symmetric) surface configuration with parallel, longer side walls extending in a Y-axis direction and shorter side walls extending in an X-axis direction and corner recesses positioned between ends of adjacent longer and shorter side walls, and with some embodiments of the invention featuring a torque enhancement device having a hole extending in a Z-axis direction. A fastener assembly is also provided that includes one or more torque enhancement devices as well as methods for utilization of the torque enhancement device or utilization or assemblage of an assembly including a torque enhancement device. The surface configuration includes arrangements where there is a torque differential in one direction or the other as well as arrangements that are adapted to handle both standard fastener configurations and torque enhancement configurations with a common torque enhancement device.

A fastening arrangement in the form of a pin and sleeve combination is provided for fixing one or more screening media modules on top of screen support panel structure. The fastening arrangement includes a pin capable of being screwed into a sleeve, the pin being provided with engagement elements capable of connecting with complementary projections on a handling tool for facilitation of installing and dismantling the fastening arrangement. A method for fastening the screening media module on to the screen support panel structure, and a screening equipment housing the same for separating solid materials according to size is also provided.