Grade CM1CG5CBN6 Grades and Grade Descriptions A/B Series P Steel Coatings provide high-speed M Stainless Steel capability and are engineered K Cast Iron for finishing to light roughing. N Non-Ferrous S High-Temp Alloys H Hardened Materials wearresistance toughness Coating Grade Description 05 10 15 20 25 30 35 40 45 P Uncoated carbide. A very tough, ultra-fine grain unalloyed substrate. M For general-purpose machining of most steels, stainless steels, high-temperature K alloys, titanium, irons, and non-ferrous materials. Performs best at low speeds and will handle interruptions and high feed rates. Use when C2, C3, or C25 fail N due to chipping or breaking. S HW-S25 P M A PVD-TiN-coated grade. Straight 9.5% Co substrate. Submicron grain. For general-purpose machining of most steels, stainless steels, high-temperature alloys, K titanium, irons, and non-ferrous materials. Performs best at low speeds and N will handle interruptions and high feed rates. S HC-S25 PcBN tip brazed onto a carbide insert. Recommended for machining hardened steel (45–65 HRC). Use on bearing steel, hot and cold work tool steels, high-speed steels, die steels, case-hardened steels, carburised and nitrided irons, and some hard coatings. Can be run both dry and wet. BN-H25 H widia.com D65