EM / GM / EPM (Series Code): "EM" stands universally for End Mill. Depending on your specific supplier brand (such as the highly common ZCC-CT series), a leading letter may denote a specialized material grade, like GM for general-purpose machining or HMX for high-hardness cutting.
4E (Flute Count): Indicates it is a 4-Flute (4-Edge / 4-Teeth) cutting tool. Four flutes provide high tool core rigidity and are ideal for peripheral side-milling, finishing, and profile cutting where chip evacuation space is less critical than surface quality.
D10.0 (Cutter Diameter): The precise cutting outer diameter of the tool is 10.0 mm.
Physical Characteristics & Pairings
Shank Alignment: This standard 10mm cutting diameter usually features a matching 10mm straight cylindrical shank, meaning it can slide cleanly into your previously discussed Q40XER32X85L Tool Holder using a standard ER32-10mm collet pocket.