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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. 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 ...

4. Trailer connectors in North America - Wikipedia

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

   Flat 5-pin connector (Towing vehicle side) This contact is not as common, but is compatible with the 4-pin connector in the way that a towing vehicle with this connector can be connected to a trailer with the 4-pin flat plug. The extra connection is often used to block the surge brakes when reversing with the trailer. #

5. ISO standards for trailer connectors - Wikipedia

   en.wikipedia.org/wiki/ISO_standards_for_trailer...

   12 Volt 7-pin trailer connector ISO 7638-2 for ABS and EBS (Towing vehicle side) Physical design according to standard ISO 7638-2. [4] [6] [7] This connector is intended to be used for 12V ABS and EBS on heavy duty trailers. Identified by key tab on outer ring between pin 3 and 4. #

6. Three-point hitch - Wikipedia

   en.wikipedia.org/wiki/Three-point_hitch

   The implement is secured by placing a pin on the ends of the posts. The hitch lifting arms are powered by the tractor's own hydraulic system. The hydraulic system is controlled by the operator, and usually a variety of settings are available. A draft control mechanism is often present in modern three-point hitch systems.

7. 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".