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2. 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".

3. Linchpin - Wikipedia

   en.wikipedia.org/wiki/Linchpin

   The word is first attested in the late fourteenth century and derives from Middle English elements meaning "axletree pin". [1] [2] Securing implements onto the three-point hitch of a tractor is an example of application. Linchpins may also be used in place of an R-clip for securing hitch pins. [3]

4. 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.

5. Clevis fastener - Wikipedia

   en.wikipedia.org/wiki/Clevis_fastener

   Threaded clevis pins have a partially threaded shank on one end and a formed head on the other. The formed head has a lip, which acts as a stop when threading the pin into the shackle, and a flattened tab with a cross-hole. The flattened tab allows for easy installation of the pin and the cross-hole allows the pin to be moused. [3]

6. 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 ...

7. Pintle - Wikipedia

   en.wikipedia.org/wiki/Pintle

   In transportation, a pintle hitch is a type of tow hitch that uses a tow ring configuration to secure to a hook or a ball combination for the purpose of towing an unpowered vehicle. [1] [2] As a weapon mount, a pintle mount is used with machine guns as the mounting hardware that mates the machine gun to a vehicle or tripod. Essentially, the ...