FEMALE SCREW COMPONENT AND FASTENING COMPONENT UTILIZING SAME

摘要

[Object] It is an object of the present invention is to provide a female thread member capable of preventing seizing caused by inclined insertion, and being smoothly fastened from any directions in which a bolt is inserted, and a fastening member using the female thread member. [Solving Means] A non-thread portion 14 is formed on an inner peripheral surface of a female thread member body 10 having a female thread 13 for a length corresponding to at least one pitch from an end surface 11 on a bolt-inserting side, and a projection 15 which comes into contract with a flank surface of a male thread 21 of an inserted bolt 20 is formed on a line extending from a helical line of the female thread. The female thread member is used in combination with the bolt 20 having no incomplete thread portion, and there is no adverse possibility of seizing regardless of any directions in which the bolt is inserted. It is more preferable that a position of a leading end of the female thread 13 of the female thread member body 10 and a position of a leading end of the projection 15 are deviated from each other in a circumferential direction of the female thread member.