An insert may include an outer sleeve that includes a first tubular portion and a first disk portion perpendicular to the first tubular portion at an end of the first tubular portion. An inner sleeve includes a second tubular portion and a second disk portion perpendicular to the second tubular portion at an end of the second tubular portion. The second tubular portion of the inner sleeve may be configured to be inserted in the first tubular portion of the outer sleeve. The first disk portion of the outer sleeve may include a first surface and a second surface, wherein the second surface includes a recess configured to accommodate the second disk portion of the inner sleeve when the second tubular portion is inserted in the first tubular portion.

The invention relates to a method for installing metallic fastener (10; 40) for the interference fit assembly of at least two structural elements (20, 22) comprising a through hole, the fastener comprising an enlarged head (12; 42), a shaft (14; 44) having an external diameter before installation that is greater than an internal diameter of the hole, said shaft comprising a conductive surface (26; 56). Before installation, at least the conductive surface (26; 56) is coated with a lubricating layer (30), which comprises a mixture of at least one polyolefin and one polytetrafluoroethylene, for example, having sufficient adherence to prevent its abrasion by manual manipulation of the fastener and being weak enough to be at least partly stripped from the conductive surface during the interference fit assembly of the fastener. The invention is applicable to the assembly of aircraft structures.

A cable-to-pipe connector is provided. A cable-to-pipe connector for providing continuous transfer of current from a cable to a utility pipe in above grade and below grade systems, comprising a conductive lug comprising a head at a top end of the conductive lug affixed to a noncircular neck that is further affixed to a body in a linear formation, the head, the neck, and the body having decreasing diameters respectively. An insulating shell partially encasing by the conductive lug. A horizontal aperture at a midway point of the head. A first fastener extending from above a top of the head through the horizontal aperture. A threaded member at a base end of the conductive lug and a bottom end of the insulation shell.

A method to prevent corrosion of a susceptible article of a two-article system, in which first and second articles of the two-article system have surfaces facing one another and in which the two articles have different anodic indices includes applying a coating material to the surface of the first article and curing the coating material on the surface of the first article. The method further includes contacting and securing the surface of the first article with the surface of the second article. The two articles exhibit substantially no corrosion following exposure to a corrosive environment under standard GMW17026 for a 15 year simulated test.

A bolt includes a head portion on which a recess is formed. The recess has a bottom surface and a sidewall extending from a periphery of the bottom surface. The sidewall has a lower end defined by the bottom surface and includes an increased diameter portion and a reduced diameter portion. The increased diameter portion has an inner diameter larger than an inner diameter of the lower end of the side wall. The reduced diameter portion has an inner diameter smaller than the inner diameter of the increased diameter portion. The reduced diameter portion is located opposite to the bottom surface across the increased diameter portion.

A bolt-nut (1) includes: a nut body (4) in a substantially cylindrical shape; plural nut divided bodies (4a); a cover body (5) in a substantially cylindrical shape for covering the nut body (4); a cover-side tapered portion formed on an inner wall of the cover body (5); a nut-side tapered portion (4a) formed such that an outer diameter of an outer wall of the nut body (4) is reduced toward one end portion thereof so as to correspond to the cover-side tapered portion; a spring (6) that is accommodated together with the nut body (4) in the cover body (5); and a nut (2) that includes a lid body (7) covering the other end portion of the cover body (5). A bolt screw as a ridge of the bolt and a nut screw as a ridge of the nut body (4) have unequal pitches that are different from each other.

A fastening assembly includes: a panel defining an aperture; a fastener having a cap and a shaft extending from the cap, the shaft being disposed through the aperture, the fastener having a first corrosion rate, and the fastener including: a recess formed in the cap and extending at least partially around the shaft; face surfaces that are planar and that are to directly contact the panel; and recessed channels that are disposed between the face surfaces, respectively, that are recessed relative to the face surfaces, and that extend from a radially outer edge of the cap to the recess; and an anode insert disposed in the recess and having a second corrosion rate that is faster than the first corrosion rate.

Provided is a fastening member having a base material including an aluminum alloy and an anticorrosive film with which the base material is coated. This anticorrosive film contains aluminum hydroxide oxide (AlO(OH)), and in a profile obtained from X-ray diffractometry with a Cu-Kα radiation on the fastening member, a peak intensity ratio R (I.sub.B(020)/I.sub.Al(200)) is 0.003 or more and 0.1 or less, wherein I.sub.B(020) is an intensity of a diffraction peak of a (020) plane of aluminum hydroxide oxide, and I.sub.Al(200) is an intensity of a diffraction peak of a (200) plane of aluminum as a main peak. The anticorrosive film formed by the present invention is uniformly formed on the fastening member and excellent in stability and adhesion.

A fastener painting system is a system for painting a head of a fastener. The system includes: a cup for covering the head of the fastener by contacting an edge of the cup with a surface of the object; a supply system; a liquid discharging system; and a moving mechanism. The cup has a cavity for being filled up with paint. The supply system is configured to store the paint and supply the paint into the cavity of the cup. The liquid discharging system is configured to discharge surplus paint in the cavity out of the cup. The moving mechanism is configured to change a position of the cup relative to the object. The cup has a supply port for supplying the paint into the cavity, a vent for discharging air in the cavity out, and a liquid discharging port for discharging the surplus paint out of the cavity.

A faceted lobular threaded component and methods for making and/or installing the same. A faceted lobular threaded component may include a head, and a shank extending along a longitudinal axis away from the head. The component may also include an external faceted lobular thread in the shank extending around the longitudinal axis. The external faceted lobular thread may include at least four facets per thread revolution, and at least four lobes per thread revolution circumferentially interspersed between the at least four facets and established by the at least four facets.