A combination nut assembly includes first and second tightening nuts, each engageable with a bolt and having an interior frustum-shaped fitting socket and a dual frustoconical locking nut engageable with the bolt and elastically deformable and consists of two exterior frustum-shaped half locking nut members identical in geometric configuration and symmetrically inverted in position integrally connected together as a single part with their larger ends jointly connected and located between the first and second tightening nuts when assembled. Each half locking nut member protrudes an axial distance “e” from a bearing surface of the tightening nut in an assembled position. Axial distance “e” is defined by p>e≥α/tan θ, where: “θ” is cone generating angle; “α” is perpendicular backlash between flanks of threads of the bolt and locking nut in an ordinarily engaged position; and “p” is locking nut pitch.

The present invention relates to a novel screw that causes drag and prohibits unwinding of the screw. The screw is designed for use in eyeglasses for securing eyeglass lenses and prohibiting same from falling out. The screw includes a fillister head, a drive disposed on the head for engaging a screwdriver, a shaft running from the head to a terminal end, the shaft having non-contiguous circumferential threads along the length of the shaft for rotatably sliding the screw through slots. The screw includes a longitudinal channel in the form of a slot disposed along the surface of the shaft and through the length of the shaft. A planar bar of neoprene or any other polypropene can be inserted in the channel which assists with prohibiting unwinding of the screw when the screw is in use.

A universal hardware nut that may be adaptable for use with various mating fasteners (e.g., bolts and screws). In one embodiment, the universal hardware nut comprises a nut body, wherein the nut body is manufactured from a pliable material; and one or more slots, wherein the one or more slots allow the nut body to accept fasteners of different sizes and shapes. In alternate embodiments, the universal hardware nut may comprise a sized hole instead of the one or more slots, or may comprise a combination of a sized hole and one or more slots.

The present invention relates to innovative fasteners for joining two or more objects together.

The present invention relates to innovative fasteners for joining two or more objects together.

A nut and a bolt are provided, which make it difficult to be loosened once they have been tightened. A security nut includes: a nut body having an inside screw; and a plurality of torque transmission projections provided on an outer surface of the nut body along a circumferential direction. Each torque transmission projection has a torque transmission surface provided on an upstream side in a tightening direction of the security nut, and a release surface provided on a downstream side in the tightening direction of the security nut. A ridge line is formed between the release surface and the torque transmission surface, the ridge line inclining toward the upstream side of the tightening direction along the circumferential direction, from an advancing-direction end of the nut body to a retracting-direction end of the nut body.

A nut and a bolt are provided, which make it difficult to be loosened once they have been tightened. A security nut includes: a nut body having an inside screw; and a plurality of torque transmission projections provided on an outer surface of the nut body along a circumferential direction. Each torque transmission projection has a torque transmission surface provided on an upstream side in a tightening direction of the security nut, and a release surface provided on a downstream side in the tightening direction of the security nut. A ridge line is formed between the release surface and the torque transmission surface, the ridge line inclining toward the upstream side of the tightening direction along the circumferential direction, from an advancing-direction end of the nut body to a retracting-direction end of the nut body.

A modular screw is provided, wherein the screw includes, in an axial direction, the following elements: a screw head, a shank having a second functional portion, a third functional portion for distributing a prestressing force, wherein a washer is arranged in the second functional portion and is mounted so as to be rotatable about a longitudinal axis of the screw, and a fourth functional portion having an external thread, and wherein the washer is secured in an approximately positionally fixed manner in the axial direction by bearing against the second and the fourth functional portion.

A modular screw is provided, wherein the screw includes, in an axial direction, the following elements: a screw head, a shank having a second functional portion, a third functional portion for distributing a prestressing force, wherein a washer is arranged in the second functional portion and is mounted so as to be rotatable about a longitudinal axis of the screw, and a fourth functional portion having an external thread, and wherein the washer is secured in an approximately positionally fixed manner in the axial direction by bearing against the second and the fourth functional portion.

A fastening member includes a screw thread formed therein. A portion including a crest portion of the screw thread is formed of a first alloy material and includes: a thick portion where the portion is maximized in thickness in a circumferential direction; and a thin portion where the portion is minimized in thickness in the circumferential direction. A portion including a root of the screw thread is formed of a second alloy material having a tensile strength higher than that of the first alloy material.