Patent ID: 6971362

Claim:
A bolt for use in fastening a first member to a second member; said bolt comprising a male threaded portion for insertion into a female threaded portion of a hole formed in the first member, the threaded portion comprising a substantially uniform, continuous thread which extends over the entire threaded portion; said bolt comprising a bolt head and a solid unthreaded portion, the unthreaded portion extending between the bolt head and the threaded portion, the unthreaded portion having a length which is at least as long as that of the threaded portion; wherein the bolt is adapted to receive an axial load based on an external force applied to the first member; wherein the male threaded portion comprises a low-rigidity portion, in which a hollow portion is formed concentric with a center axis of the male threaded portion and substantially circular in a cross section; and wherein said hollow portion is formed at a position intended to be placed overlapping part of a screwed portion formed where the male threaded portion is screwed into the female threaded portion in an axial direction.