GRASPING BOLT FOR REPAIRING THE CRACK

摘要

A grasping bolt for repairing a crack is provided to cut a bolt header off based on a cut-off groove by applying power more than constant torque after the grasping bolt is completely assembled. A grasping bolt for repairing a crack has a bolt header(2) and a screw part(3). A screw thread(3a) of the screw part has a reverse trapezoid shape. A hammered part(4) of a tapered shape having small diameter at the screw part side is formed in the backend of the screw part. A cut-off groove(5) is formed between the hammered part and the bolt header. After the grasping bolt is completely assembled, the bolt header is cut off with power more than constant torque based on the cut-off groove.