What’s the Back Part of a Semi Truck Called?

A semi-truck is an important piece of equipment, used to transport goods all over the world. It consists of a tractor unit and one or more trailers that are connected together.

The tractor unit is the part of the vehicle that is driven and it has a large cab at the front, which contains the driver’s seat, controls, and other amenities. At the back of this cab is a large metal box called a box trailer. This trailer often contains compartments for storing goods or materials.

However, the back part of a semi-truck is not just limited to this box trailer. In fact, there are several other components that make up the back end of these vehicles. The most important component is known as the fifth wheel coupling, which connects the tractor unit to the trailer or trailers.

The fifth wheel coupling consists of two parts: a kingpin and a plate. The kingpin is a metal pin that protrudes from the center of the truck’s frame, while the plate fits over it and locks into place. This setup creates an axis for the trailer to pivot around when turning corners.

Other components found at the back end of semi-trucks include air brakes, exhaust pipes, rear bumpers, mud flaps and fuel tanks. All these components play an important role in keeping these massive vehicles safe on roads.

Conclusion:

So what’s the back part of a semi truck called? It’s simply known as the fifth wheel coupling.

This coupling consists of two parts – a kingpin and a plate – which connect together to form an axis for trailers to pivot around when turning corners. In addition to this component, other parts such as air brakes, exhaust pipes, rear bumpers, mud flaps and fuel tanks can also be found at the back end of semi-trucks.

Photo of author

Karen Watkins