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).

The rolled rod for cold-forged thermally refined articles according to the present invention has a chemical composition consisting, in mass %: C: 0.22 to 0.40%, Si: 0.35 to 1.5%, Mn: 0.20 to 0.40%, P: less than 0.020%, S: less than 0.015%, Cr: 0.70 to 1.45%, Al: 0.005 to 0.060%, Ti: 0.01 to 0.05%, B: 0.0003 to 0.0040%, N: 0.0020 to 0.0080%, and O: 0.0020% or less, with the balance being Fe and impurities, and that satisfies Formula (1) and Formula (2), wherein a total area fraction of pro-eutectoid ferrite and pearlite is 90% or more, an area fraction of the pro-eutectoid ferrite is 30% or more, and the rolled rod has a tensile strength of 700 MPa or less.

0.50C+Si/10+Mn/5+5Cr/220.85(1)

Si/Mn>1.0(2)

A fastener structure includes a fixing member and an operating member. The fixing member includes a limiting section and a body portion; and the operating member includes an operating section, a retaining section and an engaging section connected to the body portion. The body portion can be mounted to an object, and the operating section can be manipulated to move the engaging section on the body portion and to fasten the retaining section to another object. When the operating section is manipulated reversely, the retaining section can be released from the other object to thereby separate the two objects from each other. Therefore, with the fastener structure, two objects can be quickly fastened together and easily released from each other.

A binding screw for a wire connection assembly comprises a driving section, a threaded section, and a contact section. The contact section has a tapered penetration portion establishing electrical contact with a stranded wire. A length of the penetration portion is at least three-quarters of a diameter of the binding screw in the threaded section.

A duplex threaded body having a right-handed and left-handed thread on the circumferential surface of a single solid member. A single-nut or double-nut type internally-threaded body demonstrates a locking effect at an intermediate position without substantially loosening by using a combination of a duplex externally-threaded body and one or more internally-threaded bodies. Moreover, a screw structure in which a pair of internally-threaded bodies can only be removed once they are mutually coupled when screwed onto a duplex externally-threaded body, making it possible to impart tamper-proof characteristics and a locking effect. The duplex externally-threaded body has, on the outer circumferential surface, an overlapping region with a clockwise spiral right-handed thread and a counter-clockwise spiral left-handed thread in an overlapping manner. A right-handed internally-threaded body in which a right-handed thread is formed, and a left-handed internally-threaded body in which a left-handed thread is formed, that are screwed onto a duplex externally-threaded body.

A duplex threaded body having a right-handed and left-handed thread on the circumferential surface of a single solid member. A single-nut or double-nut type internally-threaded body demonstrates a locking effect at an intermediate position without substantially loosening by using a combination of a duplex externally-threaded body and one or more internally-threaded bodies. Moreover, a screw structure in which a pair of internally-threaded bodies can only be removed once they are mutually coupled when screwed onto a duplex externally-threaded body, making it possible to impart tamper-proof characteristics and a locking effect. The duplex externally-threaded body has, on the outer circumferential surface, an overlapping region with a clockwise spiral right-handed thread and a counter-clockwise spiral left-handed thread in an overlapping manner. A right-handed internally-threaded body in which a right-handed thread is formed, and a left-handed internally-threaded body in which a left-handed thread is formed, that are screwed onto a duplex externally-threaded body.

This invention uses disc shaped cams in enlarged hoes in machine feet to allow a machine to be moved and properly installed to the bedplate. Once the machine is in the proper location, the cams are locked into place with a set screw which prevents the cams from rotating and the machine from moving. The machine foot is then secured to the base by a washer and the manufacturer's specified anchor bolt is torqued to the proper value.

A slotted set screw includes a shank, a slot, a cut metal waste storing recess and an outer thread portion. The slot is provided at an end of the shank and includes an opening and a slot bottom surface. The cut metal waste storing recess is provided on the opening of the slot and includes a first vertical wall, a second vertical wall and a horizontal bottom surface. A first horizontal bottom edge connects between the first vertical wall and the horizontal bottom surface while a second horizontal bottom edge connects between the second vertical wall and the horizontal bottom surface. An included angle is formed between the first horizontal bottom edge or the second horizontal bottom edge and a longitudinal axis of the slot less than a right angle. In an embodiment, the bottom surface is lower than a level of the slot bottom surface in a vertical direction.

A pin retention device comprises a fastener defining a longitudinal axis, a first end and a second end along the longitudinal axis, a head at the first end and a threaded portion at the second end, a tubular spacer defining a thru-hole configured to receive the fastener, and a nut defining a threaded hold configured to mate with the threaded portion of the fastener.

A system used to attach a climbing hold to a chain-link fence. In one embodiment, a backing plate (10) narrow enough to slide through the openings of a chain-link fence (12) is placed on the far side of the chain-link fence (12). A climbing hold (14) is placed on the nearside of the chain-link fence (12), and a bolt (16) is used to clamp the assembly together. Other embodiments are described and shown.