Topical Terminology > Upper Coupler
Upper Coupler
For Upper Coupler we have terms and definitions in 2 topics. The topics are Truck and Trucking.
Upper Coupler (Truck) 
Load bearing surface on the underside of the front of a semi trailer It rests on the fifth wheel of a tractor or dolly and has a downward-protruding kingpin which is captured by the locking jaws of the fifth wheel.
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Upper Coupler (Trucking)
Load bearing surface on the underside of the front of a semitrailer. It rests on the fifth wheel of a tractor or dolly and has a downward-protruding kingpin which is captured by the locking jaws of the fifth wheel.
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