Gas Carburizing & Carbon Nitriding, Nitrocarburizing, Ion Nitriding, Pack Carburizing and Scale Prevention, Spark Igniters, Duffy-Catalyst, Duffy-Stainless Foil, Refractory Plugs, Nuts & Bolts, Baskets, Alumdum Balls, Heat Treating needs

Representatives
 In addition to the distribution of heat treating Stop-Off Paints and supplies, the Duffy Company represents the following manufacturers of heat treat equipment and supplies in the states of Illinois, Iowa, Minnesota, Wisconsin and Northern Indiana.