A pintle's a pin or bolt, usually inserted into a gudgeon, which's used as part of a pivot or hinge. A pintle/gudgeon set's used in many spheres, for example: in sailing to hold the rudder onto the boat; in transportation a pincer-type device clamps through a lunette ring on the tongue of a trailer; in controllable solid rocket motors a plug moves into and out of the motor throat to control thrust. In the military, a pintle's used with light machine guns as the mounting hardware that mates th… (More on Pintle)