Type QD90A Single Freedom fifthwheel with single hook wedge block has its body made of a steel plate through pressing and modeling; And the reinforced components belong to a kind of plate structure. The structure is simple, actuation reliable, separation manual and coupling automatic.

Its longitudinal oscillation >=15°
The overall height of the saddleseat: 200mm.
The rated vertical loading capacity: 3200kg.
It is suitable for the semitrailers within a tonnage 50 - 100 tons.