Abstract: Within experimental error, the graph, obtained by plotting the percentage of reduction of cross-sectional area (over the range from 10% to 40%) against the ratio of drawing stress to the original yield strength of wire with different previous amount of reduction, approaches a single curve. This result suggests, within the above range, firstly, a simple method of estimation for the drawing stress for wires with various diameters and original yield strength, and secondly, a method for estimating the average coefficient of friction of the drawing dies. By computation, it shows that the theoretically derived correction for the effect of the twice rotation of copper grains in passing through the dies is not in agreement with experimental results. It is also found that the drawn wires of same total percentage of reduction of area and same number of drawings may have considerably different values of yield strength depending upon the percentage and the sequence of successive reductions.