Qualtech DWT40PC-ROUND #4-1/2" Carbon Steel Tap and Die Set with Round Die

#4 - 1/2 in. Carbon Steel NC and NF Tap and Die Set with Round Dies. Sizes #4 - 40 in., #10 - 24 in., #10 - 32 in., #12 - 24 in., #4 - 40 in., #6 - 32 in., #8 - 32 in., 1/2 in. - 13 in., 1/4 in. - 20 in., 1/2 in. - 20 in., 1/4 in. - 28 in., 1/8 in. - 27 in., 3/8 in. - 16 in., 5/16 in. - 18 in., 5/16 in. - 24 in., 3/8 in. - 24 in., 7/16 in. - 14 in., 7/16 in. - 20 in. and 1/2 in. - 20 in. Set also includes 2 straight tap wrenches, 1 - 1/2" and 2" die handles. About Carbon Taps: Carbon Steel Hand Taps are used to re - thread damaged and/or jammed threads. Carbon Steel Hand Taps may also be used to thread mild steels. Taper Style: Starts the thread square with the workpiece. Plug Style: Generally used in thru holes. Bottom Style: Generate the thread to the bottom of the hole. About Carbon Round Adjustable Dies: For re - threading, a Carbon Steel Round Adjustable Die is desired for improved wear life. Round Dies are chamfered on both faces. 1 side has a 2 in. to 3 in. thread chamfer for threading, the other side has a 1 in. to 1-1/2 in. 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.