For threading a high speed steel round adjustable die is desired for improved wear life. Round dies are chamfered on both faces. One side has a 2 to 3 thread chamfer for threading the other side has a 1 to 1-1 2 thread chamfer for threading close to a shoulder. Adjustment is obtained by a fine pitch screw which forces the sides of the die apart or allows them to spring together. The slot is beveled so that when the dies are used in a machine holder the adjusting screw can be removed and adjustment made by the adjusting screws in the holder
Brand: Qualtech
