Torque enhancer device for grasping and tooling, and assemblies and uses thereof

A fastener assembly comprising:

• a threaded bolt member having a shaft sufficiently elongated in an axial direction as to extend through a pair of non-threaded holes in a pair of structural components to be fastened, wherein a diameter of an exterior surface of the shaft is smaller than a diameter of the non-threaded holes receiving the shaft;
• a first abutment member forming part of, or attached to, the threaded bolt member for contacting a first side of the pair of structural components and having a diameter larger than the diameter of a most adjacent one of the non-threaded holes as to enable compression contact with the first side of the structural components;
• a second abutment member having an aperture into, or through, which the threaded bolt extends, the second abutment member being in compression contact with a second side of the pair of structural components;
• and
• at least one of the first and second abutment members having a torque enhancement configuration that features has a Z-axis rotation torque generation tool contact surface configuration defined by longer torque generation tool contact side walls, each extending in a Y-axis direction and separated apart by an X-axis length (L2), and shorter torque generation tool contact side walls, each extending in an X-axis direction and separated apart by a Y-axis length (L1), and four corner recesses positioned between ends of adjacent longer and shorter side walls, the four corner recesses each being positioned radially inward of sections of the surface configuration defining the longer and shorter side walls, and wherein a ratio L2/L1 is at least 50%, and wherein the tool contact surface configuration is configured to be operated by a torque generation tool or is configured to operate as a torque generation tool.