Application Guide P M K N S H Carbon Steels AlloyList No.Low10101018Med.10351045HighSteelsDie10654140Steels4340Stainless SteelsCastIron30040017-4 PHAluminumNickelAlloyTitaniumHardened Steels60617075CastingInconel6Al4V(30 HRC)~35HRC35-4545-5050-70HRCHRCHRC Single End Multiple Flute 531 581 536 541 548 546 558 544 540 547 545 557 Single End Tapered 591 593 594 595 596 597 good best WWW.OSGTOOL.COM Illustrated Index/Application Guide 715