PIPING JOINT STRUCTURE

摘要

An object is to prevent a reduction in an inner diameter of a front end portion of a pipe to be connected, and thereby prevent an increase in a pressure loss, even when a larger axial force is secured. A piping joint structure is provided, which includes a pipe, where a first flow path for a fluid is formed therein, having an opening of the first flow path, and having a first sealing surface on an outer surface thereof, a connector where a second flow path is formed therein, having an opening of the second flow path, having a second sealing surface in an inner surface thereof, and having a male threaded portion in an outer surface thereof, and a nut having a female threaded portion to be screwed to the male threaded portion, the female threaded portion of the nut is screwed to the male threaded portion of the connector in a state that the first sealing surface of the pipe is in contact with the second sealing surface of the connector, so that the pipe is connected with the connector. In a side section of the piping joint structure including an axis of the second flow path, a male threaded portion area where the male threaded portion is away in an axial direction of the second flow path from a seal area where the first sealing surface is in contact with the second sealing surface.