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2. Fifth-wheel coupling - Wikipedia

   en.wikipedia.org/wiki/Fifth-wheel_coupling

   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- -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 ...

3. D-value (transport) - Wikipedia

   en.wikipedia.org/wiki/D-value_(transport)

   D-value (transport) In transport, D-value is a rating in kN that is typically attributed to mechanical couplings, and reflects dynamic loading limits between a towing vehicle and a trailer. The corresponding formula for a truck and trailer combination, used to determine the required D-value of a coupling, is: D (kN) = g x ( (0.6 x T x R)/ (T ...

4. Tow hitch - Wikipedia

   en.wikipedia.org/wiki/Tow_hitch

   A tow ball mounted on the rear of a vehicle. A screw-on tow hook mounted at the front of a vehicle. A tow hitch (or tow bar or trailer hitch in North America [ 1 ]) is a device attached to the chassis of a vehicle for towing, or a towbar to an aircraft nose gear. It can take the form of a tow ball to allow swiveling and articulation of a ...

5. Towing - Wikipedia

   en.wikipedia.org/wiki/Towing

   There are many forms of tow hitch, including a ball hitch, tow bar, pintle and lunette ring, three-point, fifth wheel, coupling, and drawbar, among others. The tow-ball is popular for lighter loads, readily allowing swivelling and articulation of a trailer.

6. Semi-trailer truck - Wikipedia

   en.wikipedia.org/wiki/Semi-trailer_truck

   Tractor with an end-dump trailer. A FAW semi-trailer truck in China. A semi-trailer truck[ 1 ] (also known by a wide variety of other terms - see below) is the combination of a tractor unit and one or more semi-trailers to carry freight. A semi-trailer attaches to the tractor with a type of hitch called a fifth wheel.

7. International S series - Wikipedia

   en.wikipedia.org/wiki/International_S_series

   The initial lineup consisted of heavier-duty 2200, 2500, and 2600 models (28,000-45,000 lb gross vehicle weight rating - GVWR), replacing the Fleetstar. In the summer of 1978, [2] lighter-GVWR models (replacing the Loadstar) were released for sale. The 21 models of the full lineup had a high degree of parts interghangability; this ...