The SM301 PCD Thread Milling Tool is a precision thread-milling cutter engineered for high-performance machining of threads in challenging materials. It utilises a PCD (polycrystalline diamond) cutting face (or brazed PCD segments) combined with a robust body/substrate (e.g., carbide or steel) to obtain exceptional wear resistance, low tool-wear, and high dimensional accuracy of thread profiles. Thread milling, rather than tapping, means the tool moves in a helical or circular path around or into the hole, cutting the thread profile. The PCD version is particularly suited for abrasive, non-ferrous, or composite materials where conventional tools wear rapidly. For example, one manufacturer of PCD thread-mills claims “10 × tool life compared to carbide tools” for abrasive materials. The SM301 would typically be specified for a particular thread form (e.g., M, UN, ACME, BSP), pitch, diameter range, and cutting direction (RH/LH). It will often be offered with a “solid PCD” or “braised PCD insert” design, optimized geometry (flutes, chip evacuation), and possibly internal coolant provisions.