| 摘要 |
A pipe joint, in which a pin having a tapered male thread portion formed on an outer peripheral surface of a tip end of a pipe is threaded into a box having a tapered female thread portion screwed on the tapered male thread portion and formed on an inner peripheral surface of a tip end of a pipe, characterized in that crests of female threads on the tapered female thread portion and crests of female threads on the tapered female thread portion have a predetermined width just as square thread, trapezoidal thread or buttless thread, and the crests of the both threads are inclined relative to a plane in parallel to a pipe axis in a direction opposite to a tapered surface of a row of threads. |
