Patent ID: 8533931

Claim:
A fastening method for fastening two members by a bolt and a nut, comprising (i) inserting the bolt through holes in the two members to temporarily position the nut and the bolt together, (ii) temporarily attaching a coaxial fastening tool to a leading end of a single direction threaded shaft portion of the bolt, wherein an inner member of the coaxial fastening tool engages an interior portion of the tip end of the threaded shaft, (iii) rotating the inner member to in turn individually rotate the shaft portion of the bolt until a seat surface of a head of the bolt contacts one of the two members through movement caused by the attachment and rotation of the inner member, (iv) pulling the bolt in an axial direction by a threaded member of the coaxial fastening tool, (v) rotating the nut by a fastening member of the coaxial fastening tool so as to screw the nut onto the bolt while generating an axial force in the shaft portion of the bolt, and (vi) thereafter canceling the pulling of the bolt.