Kennametal 4067344 Ball End Mill 0.25 in 4 Flute Solid Carbide

Product Description

The KENNAMETAL 4067344 is a solid carbide ball end mill from the HPHVBN series (catalog number HPHVBN250S4075), designed for high-performance milling in demanding materials including steel, stainless steel, cast iron, high-temperature alloys, and hardened materials. It features a 0.25-inch mill diameter, a 4-flute configuration with variable index spacing, and a 38-degree medium helix angle. The AlTiN PVD coating provides thermal resistance and wear protection at elevated cutting temperatures. Centercutting geometry makes it capable of both plunge entry and peripheral cutting. This tool is used by machinists and CNC operators in production and job-shop environments.

The 4067344 is suited for both roughing and finishing operations, including dynamic milling tool paths. Its micrograin carbide substrate and unequal flute spacing reduce chatter and improve surface finish in difficult-to-machine materials. With a 0.75-inch length of cut and 2.5-inch overall length on a straight-cylindrical 0.25-inch shank, it fits standard toolholders used in vertical and horizontal machining centers. Right-hand cutting direction with right-hand flute spiral is standard for conventional CNC setups.

Key Features

• AlTiN PVD coating for heat resistance in steel, stainless, and high-temp alloys
• Variable index flute spacing reduces harmonics and chatter during aggressive cuts
• Micrograin solid carbide substrate for rigidity and edge retention
• Centercutting design allows plunge entry and full-slot milling
• 38-degree medium helix angle balances chip evacuation and radial cutting force
• Rated for roughing and finishing in a single tool across ISO material groups P, M, K, S, and H

Compatibility

Designed for use in CNC machining centers with standard straight-cylindrical 0.25-inch shank toolholders. Suitable for milling steel, stainless steel, cast iron, high-temperature alloys, and hardened materials as specified by the manufacturer.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Ensure the machine spindle is fully stopped and the tool changer is in a safe state before loading or unloading the end mill. Use a calibrated toolholder with appropriate runout tolerance to protect the tight shank diameter tolerance of +0.0000/-0.0051 inches. Verify tool projection and length of cut against the programmed tool path before running the first part.