Harvey Tool 941140-C3 Corner Radius End Mill 1/4 in 4 Flute

Product Description

The HARVEY TOOL 941140-C3 is a solid carbide corner radius end mill designed for precision milling in demanding materials including steel, stainless steel, cast iron, non-ferrous metals, and composites. It features a 1/4 inch diameter, a 3/8 inch length of cut, and a 0.0400 inch corner radius that reduces stress concentration at the cutting edge and extends tool life in both roughing and finishing operations. The AlTiN PVD coating adds heat and wear resistance, making this tool well suited to high-speed and dry cutting environments. With 4 right-hand spiral flutes and a 30-degree helix, the 941140-C3 delivers efficient chip evacuation and smooth surface finishes in a compact stub-length profile.

This end mill is built for use in CNC machining centers and manual mills where tight corner radii and fine surface finishes are required in small-envelope workpieces. It fits into the Harvey Tool Miniature End Mills - Corner Radius - Stub and Standard series, which targets applications in mold and die work, medical component machining, aerospace detail parts, and precision instrument manufacturing. The centercutting geometry allows plunge entry, giving machinists more flexibility in toolpath programming. It is compatible with standard straight-shank toolholders accepting a 1/4 inch shank.

Key Features

• 0.0400 inch corner radius with a tight tolerance of plus or minus 0.0010 inch for predictable edge geometry
• Solid carbide construction for rigidity and dimensional stability in hard and abrasive materials
• AlTiN PVD coating improves heat resistance and extends tool life in steel and stainless steel
• 4 right-hand spiral flutes with 30-degree helix for efficient chip evacuation and smooth finishes
• Centercutting design supports direct plunge entry without a pre-drilled pilot hole
• Stub-length profile reduces overhang and increases rigidity in tight-clearance applications
• Suitable for both roughing and finishing passes in a single tool

Compatibility

Designed for use with standard straight-shank toolholders accepting a 1/4 inch cylindrical shank. Intended for CNC and manual milling applications in steel, stainless steel, cast iron, non-ferrous metals, and composite materials.

Installation Notes

Installation is performed by a machinist or toolroom technician using an appropriate collet or end mill holder rated for the 1/4 inch shank diameter. Ensure the toolholder and spindle are clean and free of chips before seating the tool. Confirm runout at the tool tip before beginning a cut, as excessive runout will accelerate edge wear and degrade corner radius accuracy. Follow the machine tool manufacturer and Harvey Tool recommended speeds and feeds for the workpiece material and coating type.