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Die

1) a tool to make threads on the OD of shafts.

2) Tools used to form and blank sheet metal* parts. It typically consists of a punch and a die mounted in a punch press to punch or stamp out duplicate parts in quantity. The assembly is called a die set. Die making is a very high paying skilled craft. See also tool and die maker

3) Die cast where molten metal* (usually zinc or aluminum) is injected under pressure into a mold. Similar to the process of plastic injection molding. Die making is a very high paying skilled craft.

4) The mold used in a forging operation. The process of machining these dies is called "die sinking" which is another high paying skilled craft of the machine trades.