Die Heads

A die is used to cut or form the male portion of the mating pair (e.g. a bolt). The process of cutting or forming threads using a tap is called tapping, whereas the process using a die is called threading. Both tools can be used to clean up a thread, which is called chasing. Coventry die heads and copies thereof (Rubometric, OSG etc) are the most commonly used thread cutting die heads. They are reliable, hard wearing, simple to set and use, and can be used on manual or automatic ( and CNC) machinery.die, tool or device for imparting a desired shape, form, or finish to a material. Examples include a perforated block through which metal or plastic is drawn or extruded, the hardened steel forms for producing the patterns on coins and medals by pressure, and the hollow molds into which metal or plastic is forced.