| 摘要 |
PROBLEM TO BE SOLVED: To provide a tightening nut maintaining a rotation balance and not generating vibration during rotation. SOLUTION: In a tightening nut 1 comprising a nut main body 4, a ring member 5 engaged with the nut main body 4, and a bearing ball 7 inserted between the nut main body 4 and the ring member 5 from a bolt insertion hole 6 provided on the nut main body 4 and attaching the nut main body 4 and the ring member 5 in a mutually rotatable condition, a part of an inner periphery surface of the nut main body 4 at a roughly symmetrical position against the ball insertion hole 6 is cut off. |
