Carbon 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