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A double head bolt, as the name suggests, has threads on both ends and a bare rod in the center, either thick or thin. It is also called double head screw or double head stud. It is generally used on large main equipment, such as mining machinery, bridges, automobiles, reducer frames and so on.

The most common bolt performance grade currently available is the metric grade set by ISO, which consists of two numbers separated by a dot and is usually marked on the top or side of the bolt head or nut. The more common ones are 8.8, 10.9 and 12.9.

Mention of nuts, I believe we will not be very unfamiliar, nuts are often and screws with the use of a fastener, in daily life can be seen everywhere, it can also be seen, nut market demand is really considerable.

However, due to the variety of nut types, other than the common nuts, other types of nuts are less exposed and even senior mechanics do not know much about them. Today, Aozhan Fasteners lists the main types of nuts in the market, hurry up and take the challenge, is there anything you don't know?