A wire thread insert comprises besides a cylindrical helix consisting of a plurality of coils a moving tang projecting into the interior of the helix for installing the wire thread insert into a receiving thread. The wire thread insert is connected to the cylindrical helix via a bending portion such that the moving tang can be redressed into the receiving thread after installation of the wire thread insert. The wire thread insert is installed by means of an installation tool with a mounting spindle, which installs the wire thread insert in the receiving thread via a moving shoulder and the moving tang. A compression blade provided at the mounting spindle bends the moving tang back into the receiving thread while the mounting spindle is removed from the installed wire thread insert.

A bone screw and a method for manufacturing the same includes a screw thread configuration having one or more grooves cut into a leading face of the thread, a trailing face of the thread, and/or the shaft between the threads. Other implementations include the incorporation of facets into the one or more grooves. The implementation of the one or more grooves increases the surface are of the orthopedic screw and functions to increase in anchoring the bone screw within the bone once inserted therein, and thereby reduce the possibility for the screw backing out after insertion.

A fastener system is provided. The fastener system includes a pair of nuts having a beveled end and opposed flats, a nut housing having a cavity, the cavity including an end wall with an aperture and a tapered interior portion to engage the beveled end, and opposing internal flats to engage the nut flats, a resilient member to urge the beveled ends against the tapered portion; and retaining element. The nuts may include tapered thread edges to accommodate damaged male threads, or cutting thread edges to repair damaged male threads.

A thread repair assembly is provided. The thread repair assembly comprises a cutting-nut housing including a first axial end, a second axial end and an internal cutting-nut interface, the first and second axial ends each having an opening. The thread repair assembly further includes a cutting nut at least partially enclosed by the cutting-nut housing and including a plurality of cutting threads configured to engage a threaded element when the assembly is urged in a first axial direction and disengage the threaded element when the thread repair assembly is urged in a second axial direction opposing the first axial direction.

The removal starting position (8S1) of a first removal process and the four removal starting positions (8S21-8S24) in a second removal process are established on an imaginary circle (7I) with a prescribed radius (R) that is inscribed in the apex (7C) of an incomplete thread part (7a). In each removal process, the tip of the screw thread cutting tool shaves off the apex (7C) of the incomplete thread part (7a) into respective recesses, contacting the imaginary inscribed circle (7I) from the outside (above). The multiple cutting surfaces of the apex (7C) are formed in parallel helices (that is, as mutually adjacent helical recesses) from the starting position to the ending position of the incomplete thread part. Points and burrs in the incomplete thread part can thereby be eliminated or reduced without loss of the ability to screw together with a partner threaded fastener (threaded portion).

The removal starting position (8S1) of a first removal process and the four removal starting positions (8S21-8S24) in a second removal process are established on an imaginary circle (7I) with a prescribed radius (R) that is inscribed in the apex (7C) of an incomplete thread part (7a). In each removal process, the tip of the screw thread cutting tool shaves off the apex (7C) of the incomplete thread part (7a) into respective recesses, contacting the imaginary inscribed circle (7I) from the outside (above). The multiple cutting surfaces of the apex (7C) are formed in parallel helices (that is, as mutually adjacent helical recesses) from the starting position to the ending position of the incomplete thread part. Points and burrs in the incomplete thread part can thereby be eliminated or reduced without loss of the ability to screw together with a partner threaded fastener (threaded portion).

Thread repair tools are disclosed. Methods of making thread repair tools, and methods of using thread repair tools are also disclosed.

An apparatus for cleaning a bolt having a threaded portion with a longitudinal axis of rotation. The apparatus includes a bolt receiving portion and a cleaning member. The bolt receiving portion has a throughway configured to receive the threaded portion of the bolt when the threaded portion is rotating about the longitudinal axis of rotation. The cleaning member is coupled to the bolt receiving portion and has a plurality of cleaning projections positioned to contact and clean the threaded portion of the bolt as the rotating threaded portion of the bolt passes through the throughway. The projections may be bristles or pins. Optionally, the bolt receiving portion may include a plurality of throughways each configured to receive a threaded portion having a different outer diameter. Optionally, the apparatus may include a handle portion that may be selectively couplable to the bolt receiving portion.

A screw includes a barrel-shaped central pin is surrounded by a cylindrical bore having a conical bottom. The cylindrical insert is seated in the cylindrical bore. The top surface of the central pin is lowered below the top surface of the head. The walls of the pin (4) are convex towards the insert. Manufacturing the screw includes producing the threaded part with the head with the cylindrical recess with the cone-shaped bottom. The cylindrical insert terminates at one end with a bevel with an inclination angle of =10-30. The insert is introduced into the cylindrical recess. The upper part of the insert protruding from head of the screw is pre-shaped. The pin is upset using an appropriate tool and simultaneously the top surface of the pin is lowered below the top surface of the head.

A thread cleaner comprising an elongated body with a drive end and an open end, with an abrasive section, a scraper section, and a brush section at the open end, the scraper section intermediate the abrasive section and the brush section, the scraper section, and brush sections oriented to apply radial scraping and brushing force to an elongated workpiece positioned in alignment with the thread cleaner's central axis, and the abrasive section oriented to apply abrasive force perpendicular to the thread cleaner's central axis to a surface workpiece.