I ordered these for aluminum and they work great! I had a couple of CCMT21.51 for steel but they were tarnished so I tried them on hardened RC60 steel and they lasted longer than the others! Now I will always buy theses for any metal.
π§ OSCARBIDE CCMT21-51 CCMT060204 Multilayer Carbide Insert Replacement
3 Review
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OSCARBIDE Carbide Turning TCMT090204 Replacement
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