Helical Solutions 81661 Corner Radius End Mill 3/8 in 4 Flute

Product Description

The HELICAL SOLUTIONS 81661 is a solid carbide corner radius end mill designed for high-performance milling in steel, cast iron, and alloy applications. With a 3/8 inch cutting diameter, 0.0100 inch corner radius, and four flutes in a right-hand spiral configuration, this tool delivers a balance of material removal and surface finish in a single pass. The HSV-4 series features a variable index pitch geometry that reduces harmonic vibration during aggressive cuts. An APLUS PVD coating extends tool life in abrasive ferrous materials. Licensed machinists and CNC programmers working in job shops or production environments will find this tool suited to both roughing and finishing operations.

This end mill fits stub-length applications where rigidity is critical and deflection must be minimized. The 1/2 inch length of cut (LOC) and 2 inch overall length (OAL) make it appropriate for shallow-to-mid-depth pocketing, contouring, and profiling in steel and cast iron workpieces. Primary material applications include low-alloy steel, medium alloy steel, tool steel, and cast iron. The straight cylindrical shank is compatible with high-precision toolholders and is sized at 3/8 inch shank diameter to match the cutting diameter for direct collet mounting.

Key Features

• Solid carbide construction for rigidity and heat resistance in ferrous materials
• APLUS PVD coating for extended tool life in steel and cast iron
• Variable index pitch reduces vibration and chatter during roughing and finishing passes
• 0.0100 inch corner radius protects the cutting edge and reduces stress concentration at corners
• Right-hand cut, right-hand spiral flute geometry for standard CNC milling setups
• TIR maximum of 0.0005 inch for tight dimensional control in precision applications

Compatibility

Designed for use with high-precision toolholders. Primary workpiece materials are low-alloy steel, medium alloy steel, tool steel, and cast iron. Part of the HELICAL SOLUTIONS HSV-4 series.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Ensure the machine spindle is fully stopped and the toolholder is clean and free of debris before mounting. The straight cylindrical shank requires a properly sized collet or end mill holder torqued to the toolholder manufacturer specification. Confirm runout with a dial indicator before beginning a production run, given the 0.0005 inch TIR maximum rating of this tool.