Walter-prototyp 7266772 Corner Radius End Mill 1/8 in 4 Flute

Product Description

The WALTER-PROTOTYP 7266772 is a solid carbide corner radius end mill designed for high-performance machining of hard materials. Built to the MC187 series specification, it features a 1/8 inch diameter cutting edge with a 0.015 inch corner radius and four helical flutes in a right-hand cutting direction. The tool carries a TiAlSiN (AlTiN) PVD coating applied over a fine-grain carbide substrate, which extends tool life when cutting hardened steels and other difficult alloys. With an overall length of 2.5 inches and a 1/4 inch straight cylindrical shank, it mounts directly into standard toolholders. This end mill is intended for use by machinists and CNC operators in job shop, die-mold, and production environments.

The 7266772 is suited for roughing and finishing operations on hard materials, designated under material code H. Its extended reach design, with a reach length of approximately 1.083 inches, makes it appropriate for cutting pockets, slots, and contoured surfaces where tool clearance is a factor. The 1/2 inch length of cut and high helix style support chip evacuation in demanding cuts. This tool fits standard toolholder setups and is used in CNC machining centers running high-speed or hard-milling strategies on hardened workpieces.

Key Features

• Solid carbide construction with fine-grain substrate for rigidity and wear resistance in hard material applications
• TiAlSiN PVD coating (AlTiN classification) extends tool life in hardened steel and abrasive alloy cuts
• 0.015 inch corner radius reduces stress concentration at the cutting edge and improves surface finish
• High helix, four-flute geometry supports efficient chip removal during roughing and finishing passes
• Extended reach with 1.083 inch reach length accommodates deeper pocket and contour work
• Right-hand flute direction and right-hand cutting direction for standard CNC spindle compatibility

Compatibility

Designed for use with standard straight-shank toolholders accepting a 1/4 inch shank diameter. Suited for CNC machining centers performing hard milling, die-mold work, or finish machining on hardened materials classified under material group H.

Installation Notes

Installation and tool changes should be performed by qualified machinists with the spindle powered down and the machine in a safe, locked-out state. The 1/4 inch straight cylindrical shank with h6 tolerance is intended for collet or shrink-fit toolholders; verify runout after installation to maximize tool life. Do not use this tool on non-center-cutting applications that require plunging without a pre-drilled entry point, as this end mill is not center-cutting. Follow the toolholder manufacturer torque specifications and machine tool guidelines for proper clamping force.