BOLT AND FASTENING BODY WITH LOCK NUT FASTENED ON THE BOLT

摘要

PROBLEM TO BE SOLVED: To prevent the looseness of a connecting body of a bolt using a lock nut even under large vibration load. SOLUTION: After non-connecting body is fastened by a bolt and a power nut, and the power nut is fastened by a lock nut having pitches finer than a screw pitch of the power nut. A plate provided with a plurality of protrusion parts around it is inserted around a bolt and between the power nut and the lock nut, the protrusion parts are folded, it is engaged with the power nut and the lock nut, and thereby, rotation of the lock nut is prevented.