TOOLTALK Turning Insert Designation Overview General turning inserts come in a variety of shapes and sizes. However, there is a simple nomenclature of letters and numbers associated with each that makes it easy to identify its characteristics. There are two types of insert designation systems: The American National Standard Institute and the International Standards Organization. Both assign meaning to each letter and number, but ANSI is based on inches and ISO is based on the metric system. C Shape 4 Size (IC) N Clearance Angle 3 Thickness M Tolerance 2 Corner Radius G Groove/Hole (Type) 1: Shape e.g. “CNMG432” / “CCMT32.51” A - Parallelogram, nose angle 85° C - Diamond, nose angle 80° D - Diamond, nose angle 55° K - Parallelogram, nose angle 55° L - Rectangle, nose angle 90° M - Diamond, nose angle 86° R - Round, nose angle 360° S - Square, nose angle 90° T - Triangle, 60° V - Diamond, nose angle 35° W - Trigon, nose angle 80° 2: Relief Angle e.g. “CNMG432” / “CCMT32.51” N - 0° A - 3° B - 5° C - 7° P - 11° D - 15° E - 20° F - 25° G - 30° Insert Selection by Application Material ISO 513 Color System ISO Color Codes Nonferrous Alloys N aluminum and other nonferrous metals, nonmetal work materials. Hi-Temp Alloys, Special Alloys, and Titanium are S high-temperature and special alloys based on iron, nickel, cobalt, titanium, and titanium alloys. Stainless Steel consists M of stainless austenitic, austenitic-ferritic, and cast steel. Steels would be all steels P and cast steel except rustproof steel with austenitic microstructure. Cast Iron includes spherical K graphite, and annealed cast iron. Hardened Materials are H hardened steel, hardened cast iron materials, and chilled cast iron. Looking for Metalworking Tools? Contact Fastenal at 844.365.8665 or cuttingtoolsupport@fastenal.com Go to fastenal.com/metalworking for previous Tool Talks
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