JOST International has been manufacturing fifth wheel coupling devices since 1956. In fact, we submitted the patent for the first-ever steel cast fifth wheel coupling. As a leading manufacturer of fifth wheels, we want to make sure that anyone in the industry, new or experienced, has access to helpful, informative content about all of our components. With that goal in mind, we’re tackling a popular question from those new to the semi-truck and industrial transportation industry: “how does a fifth wheel work on a semi?”.

Coupling is when the truck’s 5th wheel locking jaws lock around the trailer’s kingpin. This connection allows the truck to haul the trailer. Proper coupling techniques can prevent unnecessary damage to the equipment.

The 5th wheel is one of the most practical devices that transforms your vehicle into a multifunctional facility. This is enabled via a hitch that is attached to your SUV, truck, RV, tractor, or lorry. Despite the complicated duties the fifth wheel serves, the system is quite simple.

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