Seco 03215381 Ball End Mill 0.059 in 2 Flute Carbide Diamond

Product Description

The SECO 03215381 is a solid carbide ball end mill from the JMB642 series, designed for high-precision milling of graphite and similarly abrasive non-metallic materials. It features a 0.059 inch (1.50 mm) mill diameter with a 0.75 mm nose radius and carries a PVD diamond coating that resists the extreme abrasive wear graphite imposes on cutting edges. The two-flute, single-end design uses a right-hand helical flute configuration at a 30-degree helix angle, falling in the medium helix style category. With an extended reach geometry and a neck length of 0.24 inches (5.10 mm), this tool reaches into tighter workpiece features without sacrificing rigidity.

This end mill is intended for use in CNC machining centers performing roughing and finishing passes on graphite electrodes and comparable workpiece materials. The extended reach and reduced neck diameter of 1.40 mm allow access to deep cavities and fine-detail electrode geometries common in EDM (electrical discharge machining) toolroom applications. It mounts on a straight-cylindrical 4 mm shank (0.16 inches) with a h5 shank diameter tolerance, fitting standard ER collet toolholding systems used by machining professionals.

Key Features

• PVD diamond coating for superior wear resistance on abrasive graphite and non-metallic materials
• Extended reach design with 0.30 inch (7.50 mm) reach length and 1.40 mm neck diameter for deep-cavity access
• Micrograin solid carbide substrate for edge stability at small diameters
• Right-hand cut and right-hand helical flutes at 30-degree helix angle for efficient chip evacuation
• Rated for both roughing and finishing material removal in a single tool
• Low TIR maximum of 0.01 mm for tight runout control at this diameter

Compatibility

The 03215381 belongs to the SECO JMB642 series and is catalogued under manufacturer part JMB642015G3B.0Z2-DIA. It is designed for use with standard straight-cylindrical collet toolholding systems accepting a 4 mm shank, and is optimized for graphite milling applications.

Installation Notes

This tool is installed and operated by skilled CNC machinists or toolroom technicians using calibrated collet chucks or ER collet holders sized for a 4 mm shank. Before mounting, confirm collet bore cleanliness and runout within specification, as runout at this diameter directly affects surface finish and tool life. Always verify spindle RPM and feed rate settings against the tool manufacturer's cutting data for the specific workpiece material before starting a cut. Do not use this tool on ferrous materials — it is engineered specifically for graphite and similar non-metallic, abrasive workpieces.