C (Shape): Indicates an 80° rhombic (diamond) profile. This delivers excellent edge strength and structural support, rendering it more robust than sharper finishing profiles.
C (Clearance): Signifies a 7° positive relief angle. Positive inserts reduce cutting forces and friction, making them highly suited for internal boring operations or thin, flexible workpieces where deflection must be avoided.
M (Tolerance): Defines the strict manufacturing limits on dimensions like corner height and thickness.
T (Fixing/Style): Represents a single-sided insert engineered with a countersunk clamping hole and a chip groove on the top face.
09 (Size): Denotes a nominal cutting edge length of 9.7 mm.
T3 (Thickness): A standard code indicating an exact thickness of 3.97 mm.
04 (Nose Radius): Specifies a corner radius of 0.4 mm. This fine tip is optimal for medium-to-light finishing passes while keeping back-pressure to a minimum.
2. Chipbreaker and Grade (.CM 2430FS)
.CM (Chipbreaker Profile): Designed specifically for Medium Machining. It breaks down long, stringy chips into tight, safe segments across a wide range of feed rates.
2430FS (Grade Specification): This identifies the CRM CP2430 grade with an FS (Finishing/Semi-finishing) micro-geometry. It is a premium multi-layer coated carbide engineered specifically for Carbon Steel, Alloy Steel, and Stainless Steel. It provides maximum wear resistance and copes exceptionally well with the extreme frictional heat generated during medium and roughing cuts.