Hex bolt and nut are also known as machine bolts and nuts. They are wildly used in utility and transmission industry. These fittings are mainly for fastening the pole line hardware or power line accessories.
The raw material is steel rod. The steel rod is heated to red-hot by the electric stove, then the red rods are punched into the hexagon head (hot forged). The screw is made by a rolling machine. The next key step is galvanizing process, usually HDG. The zinc thickness is following ISO 1461, minimum average is 55μm.
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