® Mill-Thread Technical Section Mill-Thread Inserts Speed and Feed Selection MT7 Sub-Micron Grade with Titanium Aluminum Nitride multi-layer coating (ISO K10 - K20). This is a general purpose grade, which can be used with all materials; it should be run at medium to high cutting speeds. Cutting Speed m/min ISO Materials MT7 Low and Medium Carbon Steels 115 - 280 P High Carbon Steels 130 - 200 Alloy Steels, Treated Steels 105 - 180 Stainless Steels 130 - 190 M Cast Steels 150 - 190 K Cast Iron 80 - 70 Non-Ferrous & Aluminum 180 - 340 N Synthetics, Duroplastics, Thermoplastics 115 - 460 S Nickel Alloys, Titanium Alloys 25 - 90 Recommended FEED RATE: 0.05 - 0.15 mm B12-5