A U-bolt (10) according to the present disclosure includes a pair of shaft parts (11) aligned in a first direction and extending in a second direction orthogonal to the first direction; a bridge part (12) which connects one ends of each of the pair of shaft parts (11); and a first pair of strain gauges (14) which are stuck to at least one shaft part (11) of the pair of shaft parts (11) to face each other with the shaft part (11) sandwiched in the first direction, and which output a signal corresponding to bending of the shaft part (11) in the second direction.

To provide a fastening structure for fastening a left-right screw intersection forming bolt, which has a simple structure and does not loosen. A right screw nut having a recess, an elastic member having a rotation-preventing protrusion and a tongue portion, and a left screw nut having a tapered surface and a recess are included. After the bolt is tightened with the right screw nut and the elastic member is mounted, the tongue portion of the elastic member is tightened while being pressed with the left screw nut, so that the tongue portion jumps up to the recess of the left screw nut, and the left screw nut is locked and fastened. As illustrated in FIG. 9, the fastening structure can also be configured by changing the right screw nut to a left screw nut, the elastic member to an elastic member, and the left screw nut to a right screw nut.

A wall-mountable accessory such as one which is intended for hanging in a bathroom. The wall-mountable accessory may be a robe hook, a towel bar, a grab bar, a toilet paper holder, a ledge, or the like. The wall-mountable accessory may include a solid body that is at least partially formed from a brittle material. The solid body may have a hole that extends to an opening in its outer surface. The wall-mountable accessory may also include a mounting assembly for mounting the solid body to a wall. The mounting assembly may include a standoff configured to be coupled to the wall and a fastening pin that is coupled to the standoff and has a portion that nests within the hole in the solid body. The mounting assembly may apply a compressive force onto the solid body to prevent fracture.

To provide a fastening structure for fastening a left-right screw intersection forming bolt (1), which has a simple structure and does not loosen.

A right screw nut (2) having a recess (2a), an elastic member (3) having a rotation-preventing protrusion (3a) and a tongue portion (3b), and a left screw nut (4) having a tapered surface (4a) and a recess (4b) are included. After the bolt (1) is tightened with the right screw nut (2) and the elastic member (3) is mounted, the tongue portion (3b) of the elastic member is tightened while being pressed with the left screw nut (4), so that the tongue portion (3a) jumps up to the recess (4b) of the left screw nut, and the left screw nut is locked and fastened. As illustrated in FIG. 9, the fastening structure can also be configured by changing the right screw nut (2) to a left screw nut (2h), the elastic member (3) to an elastic member (3h), and the left screw nut (4) to a right screw nut (4h).

A U-bolt (10) according to the present disclosure is a U-bolt (10) fastened to a fastened object (2), the U-bolt including: a body part (11) which include a pair of shaft parts (111) aligned in a first direction and extending in a second direction orthogonal to the first direction, and a bridge part (112) which connects one ends of each of the pair of shaft parts (111), includes a U-shaped apex formed by the U-bolt (10), and is configured to be linearly symmetric with respect to an imaginary straight line (OX) extending in the second direction; and a pair of screw parts (12) provided at the other ends of each of the pair of shaft parts (111), in which a length mark indicating an index related to a length of the body part (11) along a direction in which the body part (11) extends from the apex is attached to each of the pair of shaft parts (111).

Provided in the context of a bolt is a method for achieving antiloosening capability such as will make it possible for tightening operations to be carried out easily and rapidly, and such as will make it possible to obtain antiloosening effect in robust and reliable fashion. Comprised, in such form as if a single bolt had been cut into two perpendicularly with respect to an axis thereof at a location midway along the axis thereof, of first bolt 11 having a bolt head and second bolt 12 having a threaded tip; second bolt 12 being such that an eccentric columnar portion 123 which is smaller in diameter than a diameter of the shaft of the second bolt 12 is provided at cutting plane 122 in such fashion as to protrude outward in an axial direction in eccentric fashion with respect to a direction perpendicular to a central axis, and such that side face protrusion 124 is formed at an outside circumferential side face of eccentric columnar portion 123; first bolt 11 being such that eccentric cylindrical portion 113 that mates with eccentric columnar portion 123 is formed at cutting plane 112 in eccentric fashion with respect to a direction perpendicular to a central axis, axial groove 114 being formed in a direction parallel to the central axis and radial groove 115 being formed in a radial direction at the interior thereof; the entirety constituting locking bolt 1.

Provided in the context of a bolt is a method for achieving antiloosening capability such as will make it possible for tightening operations to be carried out easily and rapidly, and such as will make it possible to obtain antiloosening effect in robust and reliable fashion. Comprised, in such form as if a single bolt had been cut into two perpendicularly with respect to an axis thereof at a location midway along the axis thereof, of first bolt 11 having a bolt head and second bolt 12 having a threaded tip; second bolt 12 being such that an eccentric columnar portion 123 which is smaller in diameter than a diameter of the shaft of the second bolt 12 is provided at cutting plane 122 in such fashion as to protrude outward in an axial direction in eccentric fashion with respect to a direction perpendicular to a central axis, and such that side face protrusion 124 is formed at an outside circumferential side face of eccentric columnar portion 123; first bolt 11 being such that eccentric cylindrical portion 113 that mates with eccentric columnar portion 123 is formed at cutting plane 112 in eccentric fashion with respect to a direction perpendicular to a central axis, axial groove 114 being formed in a direction parallel to the central axis and radial groove 115 being formed in a radial direction at the interior thereof; the entirety constituting locking bolt 1.

A high-strength bolt is provided that has high strength and excellent hydrogen embrittlement resistance characteristics. A bolt according to this invention has a chemical composition consisting of, in mass %, C: 0.22 to 0.40%, Si: 0.10 to 1.50%, Mn: 0.20 to less than 0.40%, P: 0.020% or less, S: 0.020% or less, Cr: 0.70 to 1.45%, Al: 0.005 to 0.060%, Ti: 0.010 to 0.045%, B: 0.0003 to 0.0040%, N: 0.0015 to 0.0080% and O: 0.0020% or less, with a balance being Fe and impurities, and satisfying Formula (1) and Formula (2), and with the high-strength bolt having a tensile strength of 1000 to 1300 MPa.
0.50C+Si/10+Mn/5+5Cr/220.85(1)
Si/Mn>1.0(2) Where, a content (mass %) of a corresponding element is substituted for each symbol of an element in Formula (1) and Formula (2).

A high-strength bolt is provided that has high strength and excellent hydrogen embrittlement resistance characteristics. A bolt according to this invention has a chemical composition consisting of, in mass %, C: 0.22 to 0.40%, Si: 0.10 to 1.50%, Mn: 0.20 to less than 0.40%, P: 0.020% or less, S: 0.020% or less, Cr: 0.70 to 1.45%, Al: 0.005 to 0.060%, Ti: 0.010 to 0.045%, B: 0.0003 to 0.0040%, N: 0.0015 to 0.0080% and O: 0.0020% or less, with a balance being Fe and impurities, and satisfying Formula (1) and Formula (2), and with the high-strength bolt having a tensile strength of 1000 to 1300 MPa.
0.50C+Si/10+Mn/5+5Cr/220.85(1)
Si/Mn>1.0(2) Where, a content (mass %) of a corresponding element is substituted for each symbol of an element in Formula (1) and Formula (2).