The commonly used level 8 nuts and level 4 nuts basically require hot-dip galvanizing. One is for aesthetics. The surface of the nuts and bolts before hot-dip galvanizing is natural and looks gray, which is really of little appreciation value. The surface of the nuts and bolts after hot-dip galvanizing is very bright, and can also be plated with white zinc, blue white zinc, color zinc, etc. according to requirements. Two reasons for hot-dip galvanizing bolts and nuts are of course to prevent rust. Non-hot-dip galvanized nuts and bolts will be produced after two or three months of use, while hot-dip galvanized nuts and bolts can be used for five years without rusting, so hot-dip galvanizing The anti-rust effect of zinc bolts is still quite good. The third benefit of hot-dip galvanized bolts and nuts is to facilitate installation.

Hot-dip galvanized bolts and nuts are divided into general and reamed holes. According to the top of the head, there are hexagonal heads, round heads, square heads, countersunk heads, and so on. Hexagonal heads are more common among them. Hot-dip galvanized bolts are generally used in areas where they are required to be connected. It is a non-standard part, which is U-shaped, so it is called U-shaped bolt. Hot-dip galvanized bolts have external threads on both sides that can be used with screw caps. For connecting bolts used in steel frame structure, unless otherwise specified, hot-dip galvanized bolts are generally general Indiscriminately fabricating Class C bolts.

Hot-dip galvanized bolts and nuts include thick steel plate, strip steel, stainless steel wire, seamless steel pipe, etc., among which the hot-dip galvanized thick steel plate accounts for a large proportion. For a long time, the hot-dip galvanizing process has been favored by everyone due to its cheap plating cost, protective features and beautiful appearance. It is widely used in vehicles, engineering buildings, household appliances, chemical plants, mechanical equipment, Industries such as crude oil, metallurgical industry, light industry, transportation, power engineering, airlines and marine technology.