A pipe-fitting device according to the present invention includes a fitting body and a flare packing. The fitting body has a first end portion with an inner threaded portion, a second end portion, and a narrowest portion between the first end portion of the fitting body and the second end portion of the fitting body. The flare packing has a double plane surface having different inclination angles and is provided inside a cavity of the first end portion of the fitting body.

A hose attachment fitting may include a first, male fitting portion having a threaded portion and second, female fitting portion having threaded portion which engage one another to clamp a radiator hose to the inlet or outlet of a radiator, or to attach other hoses to structures, including engines, tanks and the like.

A hose attachment fitting may include a first, male fitting portion having a threaded portion and second, female fitting portion having threaded portion which engage one another to clamp a radiator hose to the inlet or outlet of a radiator, or to attach other hoses to structures, including engines, tanks and the like.

A pipe-fitting device according to the present invention includes a fitting body, a fixing nut, and a collet. A first end of the fitting body is rotatably connected to an outer circumferential surface of a first pipe, and a second end of the fitting body surrounds an outer surface of a second pipe. A first end of the fixing nut is rotatably connected to an outer circumferential surface of the fitting body, and a second end of the fixing nut surrounds the outer surface of the second pipe. The collet is provided inside the fixing nut and presses the second pipe when the fixing nut is rotated and tightened. The collet includes a seating portion provided inside the fixing nut, a bending portion in which a bending groove is formed, a pressing portion which presses and seals the second pipe, and a protecting portion which protects the pressing portion.

A tube fitting device for facilitating tube connection position determination includes a fitting body, a pair of fixing nuts, and an O-ring. The fitting body has a cylindrical channel portion into which a first tube and a second tube may be inserted, the cylindrical channel portion comprising an accommodation groove formed therein. Each fixing nut is rotatably coupled to a respective open end of the fitting body and surrounds the first tube and the second tube, respectively. The O-ring is mounted on the accommodation groove and has an inner diameter smaller than that of the cylindrical channel portion such that the inner surface of the O-ring protrudes inside the fitting body to facilitate determining positions of the first tube and the second tube to be inserted into the cylindrical channel of the fitting body.

A ferrule for coupling a tube to a fitting body of a fitting assembly. The ferrule may include a reduced thickness portion near a nut end of the ferrule, the reduced thickness portion being thinner than adjacent portions of the ferrule and configured to flex when the fitting assembly is made up. The ferrule may include a thin section toward the bite end of the ferrule, and an axially middle portion, between the thin section and the reduced thickness portion, may be configured to bow radially outwardly during assembly. The reduced thickness portion may have a radial thickness less than any other portion of the ferrule between the nut end and a bite edge of the ferrule closest to the nut end.

A ferrule for coupling a tube to a fitting body of a fitting assembly. The ferrule may include a reduced thickness portion near a nut end of the ferrule, the reduced thickness portion being thinner than adjacent portions of the ferrule and configured to flex when the fitting assembly is made up. The ferrule may include a thin section toward the bite end of the ferrule, and an axially middle portion, between the thin section and the reduced thickness portion, may be configured to bow radially outwardly during assembly. The reduced thickness portion may have a radial thickness less than any other portion of the ferrule between the nut end and a bite edge of the ferrule closest to the nut end.

An apparatus comprising an inner ferrule and an outer ferrule. The inner ferrule comprises a plurality of engagement sections that define a plurality of gaps between the plurality of engagement sections. The outer ferrule is disposed around at least a portion of the inner ferrule. The outer ferrule comprises an engagement area mechanically joined to the plurality of engagement sections to join the inner ferrule to the outer ferrule.

An apparatus comprising an inner ferrule and an outer ferrule. The inner ferrule comprises a plurality of engagement sections that define a plurality of gaps between the plurality of engagement sections. The outer ferrule is disposed around at least a portion of the inner ferrule. The outer ferrule comprises an engagement area mechanically joined to the plurality of engagement sections to join the inner ferrule to the outer ferrule.

A tube fitting device for facilitating tube connection position determination includes a fitting body, a pair of fixing nuts, and an O-ring. The fitting body has a cylindrical channel portion into which a first tube and a second tube may be inserted, the cylindrical channel portion comprising an accommodation groove formed therein. Each fixing nut is rotatably coupled to a respective open end of the fitting body and surrounds the first tube and the second tube, respectively. The O-ring is mounted on the accommodation groove and has an inner diameter smaller than that of the cylindrical channel portion such that the inner surface of the O-ring protrudes inside the fitting body to facilitate determining positions of the first tube and the second tube to be inserted into the cylindrical channel of the fitting body.