Harvey Tool 35640 Ball End Mill 0.04 in 3 Flute Carbide

Product Description

The HARVEY TOOL 35640 is a miniature solid carbide ball end mill engineered for precision milling in tight geometries and deep-reach applications. It features a 0.04 inch mill diameter, a 0.06 inch length of cut (stub flute), and a 2.5 inch overall length with extended reach capability. The 3-flute, right-hand helical design with a 30-degree helix angle balances chip evacuation and surface finish across a range of materials. Solid carbide construction delivers the rigidity and edge retention needed for consistent results at this scale. The bright uncoated finish suits applications where coating buildup or heat sensitivity is a concern.

This end mill is suited for milling steel, stainless steel, cast iron, and non-ferrous metals in both roughing and finishing passes. The long-reach, stub-flute geometry makes it well matched for contouring, profiling, and accessing recessed features where a standard-length flute would deflect or chatter. Typical applications include mold and die work, precision machining of medical or aerospace components, and small-part fabrication requiring tight dimensional tolerances. The 0.125 inch straight-cylindrical shank fits standard collet chucks and toolholders designed for 1/8 inch shanks.

Key Features

• 0.04 inch ball nose diameter with a 0.02 inch nose radius for fine contour work
• 3-flute right-hand helical design at 30-degree helix for balanced cutting and chip flow
• Extended reach with 0.48 inch reach length and 0.42 inch neck length for deep-feature access
• Stub flute (0.06 inch LOC) reduces deflection at miniature diameters
• Solid carbide construction for rigidity and edge life in ferrous and non-ferrous materials
• Bright uncoated finish compatible with a wide range of workpiece materials and cutting fluids

Compatibility

Designed for use on CNC machining centers and high-speed spindles capable of the RPM ranges required for miniature-diameter carbide tooling. Compatible workpiece materials include steel, stainless steel, cast iron, and non-ferrous metals. Fits 1/8 inch collet chucks and toolholders with straight-cylindrical shank bores.

Installation Notes

Installation and operation should be performed by a qualified machinist or CNC tooling technician. Ensure the spindle and toolholder are clean and free of runout before seating the shank; excess runout at miniature diameters accelerates tool wear and can cause breakage. Verify collet clamping torque per the toolholder manufacturer specification before starting a cut. Coolant-through is not supported on this tool; apply external flood or mist coolant as appropriate for the workpiece material.