Kennametal 6676923 Square End Mill 3/8 Inch 4 Flute Altin

Product Description

The KENNAMETAL 6676923 is a single-end, four-flute square end mill engineered for demanding metal removal in ferrous and high-performance alloy applications. Built from solid carbide with an AlTiN coating, it operates at a 0.375-inch cutting diameter with a 0.5-inch length of cut and a 2-inch overall length. The 360 variable helix geometry — spanning 36 to 39 degrees — reduces harmonic chatter and improves chip evacuation at aggressive feed rates. The KCPM15 material grade pairs with the AlTiN finish to handle elevated cutting temperatures, making this mill a practical choice for stainless steel, hardened materials, and high-temp alloys where tool wear is a primary concern. Licensed machinists and CNC operators typically specify this tool for precision profiling, slotting, and contouring operations.

The 6676923 is designed for use in CNC machining centers and manual knee mills where a 3/8-inch shank fits standard collets or end mill holders. Its centercutting geometry allows plunge milling in addition to peripheral cutting. Primary workpiece materials include steel, stainless steel, cast iron, high-temperature alloys, and hardened materials — classified under ISO material codes P, M, K, S, and H. The 0.8-inch neck length provides a modest extension for light-reach applications while maintaining rigidity. This tool fits production and job-shop environments where consistent surface finish and edge retention across multiple part runs are required.

Key Features

• Solid carbide construction with AlTiN coating for extended tool life in high-heat applications
• 360 variable helix angle (36 to 39 degrees) reduces chatter and improves chip flow
• Variable index geometry distributes cutting forces evenly across all four flutes
• Centercutting design enables plunge entry without a pre-drilled pilot hole
• Right-hand cut, right-hand spiral flutes compatible with standard CNC spindle rotation
• KCPM15 grade optimized for steel, stainless steel, cast iron, high-temp alloys, and hardened materials

Compatibility

Designed for use with 3/8-inch collets and end mill holders in CNC machining centers and manual milling machines. Suitable for cutting steel, stainless steel, cast iron, high-temperature alloys, and hardened materials per ISO material codes P, M, K, S, and H. Part of the KENNAMETAL H1TE series.

Installation Notes

Installation is performed by machinists or CNC setup technicians using a collet chuck or end mill holder rated for the 3/8-inch shank diameter. Confirm spindle is fully stopped and machine is locked out before changing tooling. Seat the shank to the full recommended engagement depth in the holder and torque the retention mechanism per the holder manufacturer specification. Verify runout with a dial indicator before beginning a production run to protect edge integrity and part tolerance.