Abstract: An improved method of hollow metal screen frame production allows screen frames to be produced far more quickly than has heretofore been possible. Each of the cutting dies in the production line is provided with an accelerator that moves the prenotching dies at the speed of the flat sheet metal strip used to form the screen frames. As a consequence, the sheet metal strip can be fed continuously without stopping for punching of corner openings. Also, the configuration of the corners are improved by die cutting locking tabs and corresponding locking tab openings in adjacent members. Once the screen frame has been longitudinally bent at its corners to form the jamb, head, and sill members, the locking tabs of one member project through locking tab openings defined in an adjacent member. The locking tabs are simultaneously bent over using forming dies arranged in pairs with the forming dies within each pair acting in opposition to each other.