An improved plunger for a self-locking pin having a plunger section and a base section in a unitary one-piece construction, wherein the plunger section is at least substantially orthogonal to the base section. Wherein the base section comprises at least a substantially planar configuration, and may provide for biasing of the plunger section. A portion of the plunger extends outwardly from a bore of the self locking pin in which the plunger resides. The plunger section is preferably wedge-shaped, or may possess other geometrical shapes, while the portion of the plunger disposed inside the bore is of a cylindrical shape. An extended biasing section tor positioning of the plunger section may be in unitary construction with the base section.