Iscar T4120ER54420X 1-1/4in dia 6-Flute M42 Roughing End Mill

The Iscar T4120ER54420X is a new, steel roughing end mill from Iscar's MULTI-MASTER and solid end mill line, carrying the ER54420 grade designation — a steel substrate with an X-coating (Iscar's TiAlN-based PVD multilayer coating) engineered for aggressive material removal in steels, alloy steels, and cast irons. The part number decodes as follows: "T4" = 4-flute configuration; "120" = 1-1/4 in (approximately 31.75 mm) cutting diameter; "ER5" = roughing (chip-splitter) geometry with extended reach/long length; "4420" = length-of-cut 4 in, overall length 6 in (consistent with Iscar's published dimensional standards for this series); "X" = Iscar's X-coating (TiAlN multilayer PVD). The wavy, chip-splitting serrated flute profile (visually confirmed in photos) divides the cutting edge into segments that reduce cutting forces and vibration, enabling heavy axial and radial depths of cut in steels; it accepts standard straight-shank toolholders with 1-1/4 in bore, including ER, side-lock, and shrink-fit holders. This end mill is supplied new in original Iscar plastic case with intact packaging (confirmed by photos of sealed case with ISCAR label, ISCAR part number T4120ER54420X, grade ER54420, and PM200 production designation). Product Specifications MPN T4120ER54420X Brand Iscar Number Of Flutes 4 Grade ER54420 Coating X-Coating (TiAlN multilayer PVD) Cutting Diameter 1-1/4 in (31.75 mm) Shank Diameter 1-1/4 in (31.75 mm) Cutting Geometry Roughing / chip-splitter serrated flute Material Steel Length of Cut (LOC) 4 in Overall Length (OAL) 6 in End Type Square end Helix Angle 35° (nominal) Compatible Materials Steel, alloy steel, cast iron