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2. Fifth-wheel coupling - Wikipedia

   en.wikipedia.org/wiki/Fifth-wheel_coupling

   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. As the connected truck turns, the downward-facing surface of the semi-trailer (with ...

3. Three-point hitch - Wikipedia

   en.wikipedia.org/wiki/Three-point_hitch

   Adjustable three-point ball on lift arm. Ball may be rotated to fit either Category I or Category II implements Rear three-point hitch of a Case IH tractor with implement attached by the drawbar. There are five different hitch sizes, called categories. The higher category hitches have sturdier lift arms and larger connector pins. [2]

4. Tow hitch - Wikipedia

   en.wikipedia.org/wiki/Tow_hitch

   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 trailer , or a tow pin, or a tow hook with a trailer loop, often used for large or agricultural vehicles ...

5. R-clip - Wikipedia

   en.wikipedia.org/wiki/R-clip

   D: Cross-section of a new split pin An R-clip , also known as an R-pin , R-key , hairpin cotter pin , [ 1 ] hairpin cotter , [ 2 ] bridge pin , [ 2 ] hitch pin clip [ 3 ] [ 4 ] or spring cotter pin , [ 5 ] is a fastener made of a durable but flexible material, commonly hardened metal wire, resembling the shape of the letter "R".

6. Trailer connectors in North America - Wikipedia

   en.wikipedia.org/wiki/Trailer_connectors_in...

   4-pin round connector (Towing vehicle side) This connector is available in some cases instead of the flat 4-pin connector. It is less common on the U.S.-built vehicles, than 4-pin flat connector, but is still used in the older truck and SUV setups.

7. Quick coupler - Wikipedia

   en.wikipedia.org/wiki/Quick_coupler

   The claimed advantage of pin-grabbers is flexibility in use in that a machine owner can use a variety of buckets and attachments without changing the quick coupler or buying an adaptor. The claimed advantages of dedicated couplers depend on their individual design but often include better performance and smaller size.