The invention relates to a feedthrough device (10) for an explosion-proof housing which is constructed, in particular, as a "flameproof enclosure" of the flame protection type. The feedthrough device (10) is arranged in a wall opening of the housing and forms a flameproof gap therein. A rigid component (11) is arranged through said gap so as to be displaced in its direction of extension relative to the wall of the housing. The feedthrough device (10) has, in particular, a clamping body unit (20), a sleeve (21), a cap (22) and a thrust collar (23). The sleeve (21) and the cap (22) can be screwed together. Axial forces are transmitted between the clamping body unit (20) and the cap (22) via the thrust collar (23), which axial forces in turn are supported on mutually abutting surfaces (26, 36) of the clamping body unit (20) and/or of the sleeve (21) that run transversally to the longitudinal axis (L). The sleeve (21) thereby exerts a radial clamping force on the clamping body unit (20). The clamping body unit (20) is fully penetrated by a conduit (25) along a longitudinal axis (L), in which conduit a longitudinal section of a component (11) is arranged.