During the galvanizing process of hot-dip galvanized screws, there are many impurities in the hot-dip galvanizing solution, which causes the thickness of the galvanized layer on the surface of the galvanized parts to be uneven, and even galvanized. When galvanized coating is not guaranteed, it is easy to rust bolts and nuts.

In the production of hot-dip galvanized bolts, hot-dip galvanizing is a technology that obtains a coating by immersing steel, stainless steel, cast iron, and other metals into a molten liquid metal or alloy. Hot-dip galvanizing is considered to be a widely used surface treatment method for cost-effective steel products in the world. Hot-dip galvanizing products play an inestimable and irreplaceable role in reducing corrosion, extending service life, saving energy and steel materials. .


Cold galvanization, also known as galvanizing, is the use of electrolytic equipment to remove oil stains, pickles, and then put it in a solution containing zinc salts, connect the negative electrode of the electrolytic equipment, place a zinc plate opposite the pipe, connect the electrode of the positive electrolytic equipment, and Using the directional movement of the current from the positive electrode to the negative electrode, a layer of zinc is deposited on the pipe. The cold-galvanized pipe is first processed and then galvanized.

Principle of galvanizing: Because zinc is not easy to change in dry air and humid air, it can form a very dense zinc carbonate film on the surface, which can effectively protect the interior from corrosion.

PTJ Shop non-standard width range of our products can be divided into auto fasteners, mechanical fasteners, construction fasteners, power fasteners, railway fasteners, household electrical appliances fasteners and chemical fasteners.

Product standards including DIN, ISO, GB and ASME/ANSI, BS, JIS AS. Main levels of carbon steel: 4.8, 4.8, 6.8, 8.8, 10.9, and 12.9 grade, the main material of stainless steel SS201, SS304, SS316 and various kinds of special stainless steel and other.

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