:: Injection Screws ::
Most injection screws are made from 4140 or Nitralloy 135M. These screws are normally chrome-plated or nitrided. Wear resistance can be improved by applying hard surfacing to the flight tops. In recent years, due to newly engineered resins, many molders have found the need to replace those screws with through-hardened, tool steel screws. Concor specializes in the manufacturing of custom-designed, through-hardened screws(CPM 9V, Vanadis 4, D2).
Only Concor specializes in rebuilding through-hardened screws, so to ensure rebuildability, make sure you buy your original tool steel screws from Concor.
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