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A stud bolt is a straight rod with threaded ends at both ends. Generally, a bolt is a head + a screw rod, and a smooth screw rod in the middle. It is more used for electric power, such as on a transformer or assembled with a cross arm. There are many kinds of hot-dip galvanized bolts. For example, 30 bolts and 21 bolts are classified as one type. Hot-dip galvanized bolts also include tower bolts and guardrail wires.

Bolts: mechanical parts, cylindrical threaded fasteners with nuts, a type of fasteners composed of two parts, the head and the screw (cylinder with external threads), which need to be matched with the nut for tightening Two parts with through holes are firmly connected.

Hexagon bolts are the most widely used type of bolts. The grade A and grade B bolts are used for important occasions that require high assembly accuracy, and are subjected to large impact, vibration or alternating loads. The grade C bolts are used for occasions where the surface is rough and the assembly accuracy is not high. The threads on the bolts are generally ordinary threads. West Asia ordinary threaded bolts have better self-locking properties. They are mainly used for thin-walled parts or occasions subject to impact, vibration or alternating loads.

Self-drilling metal screws are usually classified as self-tapping screws. They are also self-tapping screws. The tail is different from ordinary screws. It is not a pointed tail, but like a drill.

It is easy to confuse self-tapping screws and self-drilling screws. Self-tapping screws do not integrate a drill in the screw. Some types of self-tapping screws need to drill a pilot hole before they can be driven into the material.