Abstract: A blade mounting assembly for squeegee or flood bar blades of screen printing machines is provided which includes a clamping mechanism connected to a mounting bar that releasably secures the blade assembly to the bar and over a printing screen mounted in the machine. When released, the clamping mechanism herein stays attached to the mounting bar and allows for quick and easy blade assembly replacement operations. In addition, the clamping mechanism is readily adapted to be used with mounting bars provided in screen printing machines and with blade holders that are currently clamped to the mounting bars with U-clamps. Preferably, the clamping mechanism is a spring plate which can be toggled between clamped and unclamped positions by the printer with one hand. Other forms of clamping mechanisms can include screw and air clamps for releasably securing the blade assemblies to the mounting bar of the screen printing machine.