公开(公告)号：US11162525B2

公开(公告)日：2021-11-02

申请号：US16470972

申请日：2017-11-20

Applicant: TOPURA CO., LTD.

Inventor： Kuninori Matsumoto ,  Mayumi Matsuno

IPC: F16B39/26 ,  F16B5/02 ,  F16B25/00

Abstract: An external thread member capable of performing a fastening operation efficiently without increasing the number of parts by assembling a collar into the external thread member. The external thread member 1 includes a shaft portion 5 inserted into a mounting hole 105 of a mounting member 101 through a collar 7, and the mounting member 101 is fastened to a fastening member 102. The shaft portion 5 includes a threaded portion 51 and a neck portion 52. The collar 7 is mounted on the neck portion 52 so as to be rotatable relative to each other and is engaged with the threaded portion 51 whereby retention is achieved. A counterbore hole 106 is formed in an opening close to the mounting hole 105 of an internal thread hole 104 with a tubular portion 71 inserted into the mounting hole 105 of the collar 7.