PLAIN-LANGUAGE DEFINITION
What does Fifth Wheel mean?
The coupling device mounted on a tractor that locks around a semitrailer’s kingpin.
Uzbek explanation
Tractorga o‘rnatilib semitrailer kingpinini locking jaws bilan ushlaydigan coupling device.
How the term is used in trucking
“The fifth wheel jaws closed completely around the kingpin.”
In the other language: Fifth wheel jaws kingpin atrofida to‘liq yopildi.
Why CDL drivers should know this term
You may encounter “Fifth Wheel” during CDL training, permit preparation, a vehicle inspection, dispatch communication, or daily commercial-driving work. Understanding both the official English wording and the Uzbek explanation helps you communicate clearly and recognize the term in real situations.