The King Pin can be divided into sizes 50(mm) and 90 depending on the diameter of the pull bolt. According to the standard, the tension pin can be divided into types A and B according to the shape, and can be divided into welding type and mounting type according to the mounting method. The processing materials are generally carbon steel and alloy steel.

King Pin is a standard metal part used in semi-trailer to connect tractor and trailer. Tension pins can be into mushroom type, cross type, double shovel type, "L" type, etc. to be divided. For more information about the King Pin, please read the following words.

Each link of King Pin needs to be interconnected, which is an important component that needs to be continuously researched and improved and is evolving towards the trend of serialization and generalization.

A king pin is installed on a semi-trailer and cooperates with a fifth wheel on a tractor to realize hooking up and dropping the semi-trailer and the tractor, as shown in Figure 1 below.