Harvey Tool 903216-C6 Corner Radius End Mill 1/4 in 7 Flute

Product Description

The HARVEY TOOL 903216-C6 is a solid carbide corner radius end mill engineered for milling hardened steels and hard alloys in the 45-68 Rc range. It runs a 1/4 inch diameter with a 0.005 inch corner radius, seven flutes, and a variable helix geometry that reduces harmonics and improves surface finish during both roughing and finishing passes. The AlTiN PVD coating provides thermal resistance and wear protection at elevated cutting temperatures common in hard-material machining. Overall length is 2.5 inches with a 3/8 inch length of cut. Licensed machinists and CNC toolroom techs reach for this style of tool when pushing hardened workpieces to tolerance.

This end mill is purpose-built for high-hardness ferrous materials including hardened steel, stainless steel, and cast iron rated 45 to 68 Rc. The short flute length and close pitch support aggressive depths of cut in rigid setups. Right-hand cut and right-hand flute direction make it compatible with standard spindle rotation. It is designed for use with high-precision toolholders to maintain runout tolerances required in hardened-material applications. Typical installations include die and mold work, aerospace components, and precision tool repair where workpiece hardness rules out standard carbide tooling.

Key Features

• Solid carbide construction for rigidity and wear resistance in hardened-steel applications
• Seven-flute, variable helix design reduces chatter and supports both roughing and finishing in a single tool
• AlTiN PVD coating provides high-temperature oxidation resistance for dry or minimal-lubrication cutting
• 0.005 inch corner radius with a tolerance of plus or minus 0.001 inch protects the cutting edge and reduces stress concentrations on the workpiece
• Short flute length (3/8 inch LOC) maximizes core strength and minimizes deflection in deep-pocket or narrow-wall scenarios
• Right-hand cut, right-hand helical flutes, straight-cylindrical shank for straightforward setup in standard CNC milling machines

Compatibility

Rated for steels, stainless steel, cast iron, and hard alloys in the 45-68 Rc hardness range per the Harvey Tool End Mills for Hardened Steels - Corner Radius series. Designed for use with high-precision toolholders to maintain the runout tolerances this tool class demands.

Installation Notes

Installation and operation should be performed by a qualified machinist or CNC programmer familiar with hard-material milling practices. Secure the 1/4 inch straight-cylindrical shank in a high-precision collet or hydraulic toolholder and verify runout before cutting. Because this end mill is not centercutting and does not support coolant-through, tool path and chip evacuation strategy must account for heat buildup, especially at higher Rc values. Never exceed the tool manufacturer's recommended feed and speed parameters for the specific workpiece hardness.