This TiSiN coated solid carbide end mill with Z3 three-flute geometry and 35° helix is designed for precision milling on CNC machining centres, automatic machines and conventional machine tools. The dimensional configuration is d1= 15 mm L1= 35 mm L= 85 mm. Compared with a two-flute cutter, the three-flute layout provides an additional cutting edge, higher edge support and improved feed capability, while preserving controlled chip evacuation when the radial engagement, axial depth and material are correctly selected. The flat center cutting end allows frontal machining, flat-bottom pocketing and face operations, while the peripheral cutting edges support shoulder milling, contouring and finishing of vertical walls with good geometric control. This configuration is useful when dimensional accuracy, stable surface finish and repeatability are required in mechanical workshops, precision metalworking, automotive production, mould making and maintenance departments. The TiSiN coating is designed for applications requiring high surface hardness, wear resistance and stable cutting edge protection. The titanium silicon nitride layer supports machining of steels, stainless steels, cast iron, titanium and heat-resistant alloys, and is suitable for hardened steels up to approximately 55 HRC when the machine, toolholding and cutting parameters are correctly selected. It is useful where constant surface quality, dimensional repeatability and controlled edge wear are required during precision milling. For reliable results, use rigid machines, accurate collet chucks or shrink-fit holders, reduce runout, limit excessive overhang and adapt cutting speed, feed per tooth, radial engagement and axial depth to the machine power and workpiece clamping. Correct parameter setting helps reduce vibration, form errors, dimensional deviations, premature edge wear and surface defects, improving tool life and process stability.