A wrench and nut combination, including: a wrench lug including: a wrench lug feature that substantially mates with a nut feature of a nut of a shock absorber during a first rotation of said nut, relative to external body threads on a body of the shock absorber, in a first direction, wherein the wrench lug feature and the nut feature release during a second rotation of said nut, relative to the external body threads, in a second direction, wherein at least one of the first rotation and the second rotation causes an adjustment to a compressive coil spring pre-load of a set of coil springs disposed in the shock absorber.

Fasteners, drivers, punches, fastener systems, and methods of making fasteners, drivers, punches, and fastener systems are disclosed herein. The fasteners, drivers, punches, and fastener systems include, in one example, stabilizing ribs and corresponding recesses.

An improved fastener comprising a fastener body orientated about a central axis and having a tool-engaging portion, a threaded fastening portion and a shroud-receiving portion; a shroud concentrically mounted in the shroud-receiving portion to rotate relative to the fastener body under an applied external torque and having an outwardly extending annular shoulder; the shroud-receiving portion comprising an inwardly deformed stop radially overlapping the outwardly extending annular shoulder of the shroud; and the deformed stop of the shroud-receiving portion and the annular shoulder of the shroud forming a shroud-retaining element restraining the shroud from movement in at least a first axial direction along the central axis.

A multi-head bolt (10) having a bolt shaft (12) defining a longitudinal axis (14) of the multi-head bolt and a multi-head (16) disposed at a first end of the bolt shaft, the multi-head having at least three pawls (18), each pawl having a fixed radial orientation relative to the bolt shaft and having a primary plane being aligned with the longitudinal axis of the bolt shaft and having a support surface (20).

A multi-head bolt (10) having a bolt shaft (12) defining a longitudinal axis (14) of the multi-head bolt and a multi-head (16) disposed at a first end of the bolt shaft, the multi-head having at least three pawls (18), each pawl having a fixed radial orientation relative to the bolt shaft and having a primary plane being aligned with the longitudinal axis of the bolt shaft and having a support surface (20).

An anti-loosening bolt and nut assembly structure includes a bolt having a bolt head and a bolt shank, two elastic washers, and a nut. The two elastic washers are sleeved on the bolt shank. The two elastic washers are matched with the bolt head and the nut, respectively. Each elastic washer includes an annular body having an opening. A bottom of the annular body is provided with anti-slip teeth. A top of the annular body extends upward to form an anti-loosening ring. An outer inclined surface is formed on an outer side of the anti-loosening ring. The anti-loosening ring is provided with a plurality of first unidirectional teeth. The bolt head and the nut each includes a unidirectional anti-loosening device matched with the first unidirectional teeth.

A multi-functional coupler for one or more vehicle components includes a shank, a head connected to the shank, a connector carried by the shank, and a tool. The tool is carried by the head or shank spaced from the connector, and the tool has a fastener engaging portion by which a fastener may be moved to install or remove the fastener from a component. The coupler may be used to both coupled together two or more components, and to remove fasteners or other connections via the tool of the coupler. Conveniently, as the coupler is normally installed on the vehicle to couple together two or more vehicle components, the coupler is readily available to a user wanting to remove fasteners compatible/drivable with the tool of the coupler.

A method for connecting a screw and a rotary tool in a rotationally fixed manner, wherein the drive surfaces of the driving profiles have a constant inclination relative to their profile axis, which is the same for all drive surfaces of both components. In the component with the outer driving profile, the drive surfaces are all concave or all convex, and in the component with the inner driving profile, the drive surfaces are curved complementary to the drive surfaces of the outer driving profile, in such a way that, in the plugged-together state, the drive surfaces of the two components, viewed in the circumferential direction, come into surface contact/engagement with one another on both sides of the apex of the concave/convex curvature. The driving profiles are designed in such a way that they do not come into contact with each other in the transition regions located between the drive surfaces.

A screw element is disclosed having a shaft with an outside screw thread and a longitudinal axis extending along the shaft and thereby defining a distal direction and a proximal direction, and an insertion direction and an opposite removal direction, and has a tool attachment point starting radially inwards and the tool attachment point has a central opening and in the wall of this opening at least five tooth profiles directed radially outwards and mainly parallel to the screw axis directed radially outwards and mainly parallel to the screw axis are formed in the wall of this opening, and for each tooth profile an insertion wall in insertion direction and a removal wall in removal direction can be separated, characterized in that the surface of the insertion wall is greater than the surface of the removal wall.

The present invention relates to a novel adapted screw head and screw driver device which prevents stripping. The device comprises a multipurpose flat tip screw and an associated screwdriver. The screw head comprises a tapered opening, which is sized to accommodate the screwdriver in a snug fit. This prevents the screwdriver from slipping out of the screw head.