The invention relates to a window or door sash comprising a casement which is assembled from hollow profiled strips (14, 16) and comprises a channel (24) for the lock bar, which on the room side has a rabbet (18) and with its base (20), which base on the inside of the rabbet protrudes perpendicularly in relation to said rabbet, delimits a rebated area (22). The sash presents a lock bar drive (26) which on the inside of the rabbet can be introduced into an opening in the base of the lock bar channel (20) as well as a turning handle which from the outer side of the rabbet can be coupled to the lock bar drive via a central hole (28) for receiving a polygonal lug and through two fixing holes (30', 30'') embodied in the casement (10) laterally in relation to the central hole (28). The invention aims to simplify the production process as much as possible. To this end the invention provides for the holes (28, 30', 30'') in the casement (10) to be positioned at the level of the base of the lock bar channel (20) and for the opening in said base (20) to be divided by means of two transverse links arranged in the area between the holes (28, 30', 30''). Complementary thereto, the drive housing of the lock bar drive provided for in the invention has on its outer contours a recess (70, 72) which on one side is open towards the edge, is parallel to the axis of rotation of the toothed wheel (36) and protrudes into the area between the toothed wheel (36) and one of the threaded eyes (54, 56).