Source : Webster's Revised Unabridged Dictionary (1913)

Pintle \Pin"tle\, n. [A diminutive of {Pin}.]
   1. A little pin.

   2. (Mech.) An upright pivot pin; as:
      (a) The pivot pin of a hinge.
      (b) A hook or pin on which a rudder hangs and turns.
      (c) A pivot about which the chassis swings, in some kinds
          of gun carriages.
      (d) A kingbolt of a wagon.

Source : WordNet®

pintle
     n : a pin or bolt forming the pivot of a hinge