Abstract: A sash adapted to be received in an opening in a window or the like having channels constituting tracks for the sash at opposite sides of the opening. The sash comprises a pair of side members, a pair of cross members, and fasteners for securing the side and cross members together at corner joints of the sash. The fasteners at the ends of a cross member comprise a pair of screws each having a threaded shank and a head. The shank of each screw extends through a hole in one of the side members and is received in threaded engagement in an opening in the end of the cross member. The head of each screw projects out from the respective side member, has an inner face in engagement with the side member and is adapted to be received in one of the tracks in sliding engagement for enabling sliding movement of the sash in the tracks.