The commonly used grade 8 and grade 4 nuts generally require hot-dip galvanizing treatment. One reason is for their appearance. Before hot-dip galvanizing, nuts and bolts have a natural color on their surface, which looks gray and has little appreciation value. However, after hot-dip galvanizing, nuts and bolts have a very bright surface and can also be coated with white zinc, blue white zinc, color zinc, etc. according to requirements. The second reason for hot-dip galvanizing of bolts and nuts is, of course, to prevent rust. Nuts and bolts that are not hot-dip galvanized will be produced after two to three months of use, while hot-dip galvanized nuts and bolts can be used for five years without rust, so the rust prevention effect of hot-dip galvanized bolts is quite good. The third advantage of hot-dip galvanized bolts and nuts is for easy installation.
Hot dip galvanized bolts and nuts are divided into general and those with hinged holes. According to the top shape of the head, it can be divided into hexagonal head, round mouth, square head, countersunk head, and so on. Hexagonal heads are more common among them. Hot dip galvanized bolts are generally used with countersunk heads in designated connection areas. It is a non-standard component with a U-shaped appearance, hence it is called a U-shaped bolt. The hot-dip galvanized bolt has external threads on both sides that can be connected to the screw cap. For connection bolts used in steel frame structures, unless otherwise specified, hot-dip galvanized bolts are generally made of grade C bolts.
Hot dip galvanized bolts and nuts include thick steel plates, strips, stainless steel wires, seamless steel pipes, etc. Among them, hot-dip galvanized thick steel plates account for a large proportion. The hot-dip galvanizing process has always been favored by people for its low plating cost, maintenance characteristics, and attractive appearance. It is widely used in industries such as vehicles, engineering construction, household appliances, chemical plants, mechanical equipment, crude oil, metallurgical industry, light industry, transportation, power engineering, airlines, and marine technology.
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