A torque transmission driver is disclosed. The torque transmission driver has a drive axis and a main body with a first end portion and a second end portion, where the first end portion is adapted to receive and transmit torque from a torque generating source to the driver, and the second end portion is opposite the first end portion and has a key shape adapted to fit a recess in a fastener and has a protruding lead end having a taper between 10 and 30 and different in shape than the key shape with at least a portion of the protruding lead end initiating at the major dimension of the key shape. A torque transmission driver adapted to drive a small fasteners is also disclosed where the key shape is adapted to fit the recess of the small fastener.

Methods and apparatus for a multi-dimensional asymmetrical fastening system according to various aspects of the present technology include a driver and a fastener that are configured to have corresponding conforming surfaces suitably adapted to provide engagement between a plurality of driver fins and a recessed receiving area of the fastener. The driver and fastener may each be configured to include driving surfaces of varying widths. Variable widths allow for the customization of a given driver/fastener system.

A fastener includes a screw head and a screw shank. The screw head has four driven wall portions and four guiding wall portions that are disposed about a central axis of the fastener in an alternating arrangement. The driven wall portions are equiangularly spaced apart from each other. Each of the guiding wall portions is straight and has two opposite ends that are respectively connected to two of the driven wall portions adjacent to the guiding wall portion. The driven wall portions and the guiding wall portions cooperatively define a driven recess that has an opening. A ratio of a longest distance between two of the driven wall portions that are non-adjacent to each other to a longest distance between two of the driven wall portions that are adjacent to each other is greater than 1.16. Each of the driven wall portions has a curved section and two straight sections.

A tool bit holder that accommodates and secures specific ranges of hexagonal wrench sizes in different physical orientations therein, for four purposes: speed rotation of the tool for fast bolt extraction, support of the hexagonal wrench's shaft for an increased torque application, mechanically strengthening of a hexagonal wrench, and for the application of torque centered about the longitudinal axis of the working arm of the hexagonal tool bit so as to prevent the stripping out of the hexagonal socket in the mechanical fastener.

A reversible, multiple-bit, hand tool for driving threaded fasteners and nuts includes a handle and a reversible tool holder assembly. The reversible tool holder assembly is insertable into the handle in either of two orientations to present two different ends provide multiple different configurations for driving different types of threaded fasteners and nuts. The reversible tool holder assembly includes a reversible adapter barrel, a first tool holder, a second tool holder, a first reversible bit holder, and a second reversible bit holder. Each of the tool holders can be selectively used as a nut driver with the holder assembly inserted in either orientation in the handle or can be removed from the adapter barrel and used separately as a power bit driver or a power nut driver (PND) that is received in any conventional chuck of a powered rotary tool.

A specialized tool is able to adjust the truss rod within the neck of a stringed musical instrument, even while the instrument remains fully assembled and the instrument's body partially obscures the head of the truss-rod adjustment screw. In general, the tool includes: an elongated handle defining a proximal end, a distal end, and a central longitudinal axis extending from the proximal end to the distal end; and an engagement head coupled to the distal end of the elongated handle. In certain examples, the tool includes a single-blade-type engagement head at one end of the handle, and a two-prong-type engagement head at the opposite end of the handle.

A driver for non-magnetic gripping of a socketed fastener head. The driver includes a shank and two cantilever beams. Each cantilever beam has an end and a basal segment adjacent the shank opposite the end. The driver also includes a gap defined by the two cantilever beams in resting positions. The gap extends between the two cantilever beams from an open end toward the shank. The ends of the two cantilever beams are configured to bend into the gap from the resting positions.

A screw bit body allows for efficient torque force application onto a socket fastener. The screw bit body includes a plurality of laterally-bracing sidewalls, a first base, and a second base. The laterally-bracing sidewalls are radially distributed about a rotation axis of the screw bit body with each further including a first lateral edge, a second lateral edge, a first bracing surface, a second bracing surface, and an engagement cavity. The engagement cavity creates an additional gripping point to prevent slippage in between the screw bit body and the socket fastener. The engagement cavity traverses normal and into the screw bit body from the first base to the second base. The engagement cavity comprises a protrusion arranged between a first cavity section and a second cavity section.

A set tool may comprise a handle member and a fastener retention member modularly coupled with the handle member. A permanent magnet may be positioned within a portion of the handle member and may be used to secure a ferromagnetic fastener within a fastener retention recess formed within the fastener retention member, when the fastener retention member is engaged with the handle member.

A screw bit body allows for efficient torque force application onto a socket fastener. The screw bit body includes a plurality of laterally-bracing sidewalls, a first base, and a second base. The laterally-bracing sidewalls are radially distributed about a rotation axis of the screw bit body with each further including a first lateral edge, a second lateral edge, a first bracing surface, a second bracing surface, and an engagement cavity. The engagement cavity creates an additional gripping point to prevent slippage in between the screw bit body and the socket fastener. The engagement cavity traverses normal and into the screw bit body from the first base to the second base. The engagement cavity comprises a protrusion arranged between a first cavity section and a second cavity section.