IP Library › Granted Patent US 12704147
Granted Patent B2
US 12704147 · App. 18/256,383 · Granted Aug 11, 2026

Stud bolt

Inventors: Shingo Torii (Kyoto, JP); Keiichi Miyata (Kyoto, JP); Satoshi Shirahase (Kyoto, JP)
Assignee: NITTOSEIKO CO., LTD.
F16B39/282
View Patent ↗
Loading inventors, assignments & file history…
Monitor This Case
Get email alerts when status or documents change.
Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 12704147
App. No.
18/256,383
Granted
Aug 11, 2026
Kind
B2
Abstract

A stud bolt to be fixed, in a retained state and a rotation stop state, to a mounting target plate includes a head, a screw shaft portion, a rotation stop portion, an annular groove, and an annular protrusion. The mounting target plate is to be sandwiched between a bearing surface of the head and the annular protrusion. A recessed portion recessed toward an upstream side in a screw advance direction is formed at the rotation stop portion.

Claims (52)

1 . A stud bolt to be fixed, in a retained state and a rotation stop state, to a mounting target plate, the stud bolt comprising:

a head;

a screw shaft portion extending from a bearing surface of the head;

a rotation stop portion that is formed in a non-perfect circular shape surrounding the screw shaft portion as viewed in a screw advance direction of the screw shaft portion, and that bulges toward a downstream side in the screw advance direction from the bearing surface;

an annular groove of the screw shaft portion that is recessed in an annular shape toward an inner side in a radial direction of the screw shaft portion, at a position adjacent to the rotation stop portion on the downstream side in the screw advance direction; and

an annular protrusion of the screw shaft portion that protrudes in an annular shape toward an outer side in the radial direction of the screw shaft portion, at a position adjacent to the annular groove on the downstream side in the screw advance direction, wherein

the mounting target plate is to be sandwiched between the bearing surface and the annular protrusion,

a recessed portion recessed toward an upstream side in the screw advance direction and having the same non-perfect circular shape as the rotation stop portion is formed in the rotation stop portion,

the recessed portion includes an inclined portion inclined so as to be closer to the head as the inclined portion goes from the outer side in the radial direction toward the inner side in the radial direction, and a linear portion parallel to the bearing surface, and

a most protruding end of the inclined portion is for linearly biting into the mounting target plate throughout an entire circumference of the most protruding end.

2 . The stud bolt according to claim 1 , wherein

the recessed portion is formed to become deeper as getting closer to the screw shaft portion.

3 . The stud bolt according to claim 2 , wherein

an inner edge portion of the recessed portion reaches the annular groove, and the recessed portion and the annular groove are continuous with each other.

4 . The stud bolt according to claim 3 , wherein

the recessed portion reaches an outer edge portion of the rotation stop portion, and

a projection that protrudes in a tapered state toward the downstream side in the screw advance direction is formed at the outer edge portion.

5 . The stud bolt according to claim 4 , wherein

the projection is formed to have a cross-sectional shape in which the projection includes an inclined portion on a side of the screw shaft portion and includes an erecting portion having a steeper gradient than the inclined portion on a side opposite to the screw shaft portion.

6 . The stud bolt according to claim 3 , wherein

the recessed portion is formed in an endless shape surrounding the screw shaft portion.

7 . The stud bolt according to claim 2 , wherein

the recessed portion reaches an outer edge portion of the rotation stop portion, and

a projection that protrudes in a tapered state toward the downstream side in the screw advance direction is formed at the outer edge portion.

8 . The stud bolt according to claim 7 , wherein

the projection is formed to have a cross-sectional shape in which the projection includes an inclined portion on a side of the screw shaft portion and includes an erecting portion having a steeper gradient than the inclined portion on a side opposite to the screw shaft portion.

9 . The stud bolt according to claim 7 , wherein

the recessed portion is formed in an endless shape surrounding the screw shaft portion.

10 . The stud bolt according to claim 2 , wherein

the recessed portion is formed in an endless shape surrounding the screw shaft portion.

11 . The stud bolt according to claim 1 , wherein

an inner edge portion of the recessed portion reaches the annular groove, and the recessed portion and the annular groove are continuous with each other.

12 . The stud bolt according to claim 11 , wherein

the recessed portion reaches an outer edge portion of the rotation stop portion, and

a projection that protrudes in a tapered state toward the downstream side in the screw advance direction is formed at the outer edge portion.

13 . The stud bolt according to claim 12 , wherein

the projection is formed to have a cross-sectional shape in which the projection includes an inclined portion on a side of the screw shaft portion and includes an erecting portion having a steeper gradient than the inclined portion on a side opposite to the screw shaft portion.

14 . The stud bolt according to claim 11 , wherein

the recessed portion is formed in an endless shape surrounding the screw shaft portion.

15 . The stud bolt according to claim 1 , wherein

the recessed portion reaches an outer edge portion of the rotation stop portion, and

a projection that protrudes in a tapered state toward the downstream side in the screw advance direction is formed at the outer edge portion.

16 . The stud bolt according to claim 15 , wherein

the projection is formed to have a cross-sectional shape in which the projection includes an inclined portion on a side of the screw shaft portion and includes an erecting portion having a steeper gradient than the inclined portion on a side opposite to the screw shaft portion.

17 . The stud bolt according to claim 16 , wherein

the recessed portion is formed in an endless shape surrounding the screw shaft portion.

18 . The stud bolt according to claim 15 , wherein

the recessed portion is formed in an endless shape surrounding the screw shaft portion.

19 . The stud bolt according to claim 1 , wherein

the recessed portion is formed in an endless shape surrounding the screw shaft portion.

20 . The stud bolt according to claim 19 , wherein

the recessed portion is formed in an endless shape surrounding the screw shaft portion.