Seco 03083959 Square End Mill 4mm 4 Flute Solid Carbide

Product Description

The SECO 03083959 is a single-end square end mill designed for high-performance metal removal in demanding machining applications. Built from micrograin solid carbide and coated with AlTiN, it delivers hardness and thermal resistance needed when cutting hard materials and stainless steel. The 4 mm cutting diameter pairs with an 8 mm length of cut and a variable helix geometry that reduces chatter and improves chip evacuation. With a 6 mm straight-cylindrical shank and a maximum TIR of 0.0005 inches, it seats precisely in standard collet or end mill holders. Machinists and CNC operators working in job shops, tool rooms, or production environments install and run this tool.

This end mill is suited for milling hard materials and stainless steel, including exotic alloys, in both roughing and finishing passes where a 4 mm tool diameter is specified. The STR440M.2 series geometry is optimized for right-hand cutting with helical flutes, making it appropriate for slotting, profiling, and pocketing operations on CNC machining centers and manual mills equipped for small-diameter tooling. It is a single-end tool, so it is replaced rather than flipped when the cutting end wears.

Key Features

• Micrograin solid carbide construction for rigidity and wear resistance in hard material cutting
• AlTiN coating provides thermal and oxidation resistance at elevated cutting temperatures
• Variable helix design reduces harmonic vibration and improves surface finish
• 4 flutes with right-hand helical flute geometry for efficient chip flow
• Center-cutting capable, allowing direct plunge entry into workpiece material
• Straight-cylindrical shank fits standard collet chucks and end mill holders

Compatibility

Designed as an OEM-specification replacement or direct-use end mill for CNC and manual milling applications requiring a 4 mm diameter, 6 mm shank, solid carbide square end mill in the SECO STR440M.2 series.

Installation Notes

Installation is performed by machinists or CNC setup technicians. The machine spindle must be fully stopped and the tool-change interlock confirmed before seating or removing the tool. Use a properly sized collet or end mill holder matched to the 6 mm shank diameter, and torque the retention mechanism per the holder manufacturer specification. Inspect the shank and collet bore for chips or wear before clamping to maintain TIR within tolerance.