Patent ID: 11953046
Assignee: IWATA BOLT KABUSHIKI KAISHA
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A nut comprising:
a counterbore hole; and
a screw hole having a screw thread,
wherein a depth t of the counterbore hole is set to be greater than a value calculated by Equation (1),
wherein a nominal diameter of the screw hole is D,
wherein an average value of a maximum outer diameter of a bolt configured to be fitted into the nut and a minimum outer diameter of the bolt, determined according to a tolerance of the bolt, is d [mm],
wherein an inner diameter of the counterbore hole provided on an insertion side of the screw hole is D+0.2 [mm],
wherein a pitch of the screw thread is P [mm],
wherein θ satisfies θ=arctan(P/d), and
wherein Equation 1=(D−d×cos θ)/tan θ.