Pintle

A pintle is a pin or bolt, usually inserted into a gudgeon, which is used as part of a pivot or hinge.

Pintle/gudgeon sets have many applications, for example in sailing, to hold the rudder onto the boat; in transportation, in which a pincer-type device clamps through a lunette ring on the tongue of a trailer; and in controllable solid rocket motors, in which a plug moves into and out of the motor throat to control thrust.

[citation needed] TRW used this same injector for the Descent Propulsion System on Apollo's Lunar Module.

The pintle is a highly stressed component during landing manoeuvres and is often made from exotic metal alloys.

[4] For World War II aircraft with sideways-retracting main gear units, carefully set-up "pintle angles" for such axes of rotation during retraction and extension allowed the maingear struts to be raked forward while fully extended for touchdown and better ground handling, while permitting retraction into rearwards-angled landing gear wells in their wings to usually clear the forward wing spar for stowing while in flight.