Tappet

A tappet, either for a high-pressure fuel pump or for a valve train of an internal combustion engine, with a housing whose driven side used for a contact of a tappet-following part forms a contact on a bottom side of a bridge part projecting through an inner casing of the housing. An anti-rotation locking device projects past the outer casing of the housing with a first cylinder section and sits in a window of the housing, with this anti-rotation locking device being provided as a cylindrical element, and tab-like projections project from peripheral walls of the window and the anti-rotation locking device, standing "loose" in the window, snaps behind these projections. A second cylinder section of the anti-rotation locking device extends behind the inner casing of the housing, and the bridge part, extending on an axial section of the anti-rotation locking device, has in its peripheral section a recess in its outer surface, with the second cylinder section of the anti-rotation locking device being supported against this recess.