Abstract: A printing screen and tensioning means including a rigid frame structure formed of channel shaped side members joined at the corners of the frame structure; the underside of each frame member receiving a parallelogram structure, each parallogram structure having a first and second side member connected by pivot links; the first side member being disposed adjacent the inner margin of the frame member and longitudinally movable by a screw drive; the second side member being guided for transverse movement in the frame member to and from the first member and having continuous screen attachment means; the printing screen having a continuous clip element at each side received on the attachment means, whereby upon operation of the screw drives the second side member applies a laterally outward force for uniformly stretching a corresponding side of the printing screen.