THREADED JOINT FOR STEEL PIPES

摘要

A threaded joint for steel pipes comprises a pin (1) and a box (2). The pin has male thread (11), a sealing surface (13), and a shoulder surface (14) located on the end face of the pin. Correspondingly, the box has female thre ad (21), a sealing surface (23), and a shoulder surface (24) which can mate or contact with the corresponding portions of the pin. The shoulder surface (14 ) of the pin (1) is provided at an end face of the pin. The sealing surface (1 3) of the pin (1) is located on a pipe end side near the male thread (11). A a nose portion (15) is provided on the pin (1) between the sealing surface (13 ) and the shoulder surface (14), the nose portion (15) being not in contact wi th a corresponding portion of the box (2).