The top countries of suppliers are china pakistan from which the percentage of tractor trailer fifth wheel supply is 97 1 respectively.
Tractor trailer fifth wheel manufacturers.
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The fifth wheel coupling provides the link between a semi trailer and the towing truck tractor unit leading trailer or dolly the coupling consists of a kingpin a 2 or 3 1 2 inch diameter 50 8 or 88 9 mm vertical steel pin protruding from the bottom of the front of the semi trailer and a horseshoe shaped coupling device called a fifth wheel on the rear of the towing vehicle.
A large proportion of a semi trailer s weight is supported by a tractor unit or a detachable front axle assembly known as a dolly or the tail of another trailer the other portion of the semi trailer s weight is semi.
As the chief fastener attaching tractor to trailer a fifth wheel plays a fundamental role in the safety and maneuverability of combination vehicles.
In the united states the term is also used to refer to the combination of a truck and a semi trailer a tractor trailer.
See the rv type legend for an explanation of the letters used in the last 8 columns of the table.