Kennametal 6676919 Square End Mill 1/4 in 4 Flute Solid Carbide

Product Description

The KENNAMETAL 6676919 is a solid carbide square end mill engineered for demanding material removal in ferrous and high-performance alloys. It runs a 0.25-inch cutting diameter with a 1-inch length of cut and a 3-inch overall length on a 0.25-inch straight shank. The four-flute, single-end geometry features a 360 variable helix angle ranging from 36 to 39 degrees, which reduces chatter and improves chip evacuation compared to fixed-helix designs. An AlTiN coating adds oxidation resistance and surface hardness, extending tool life in dry or semi-dry cutting conditions. Material grade KCPM15 is a fine-grain carbide substrate formulated for edge integrity in difficult cuts. The H1TE series is a go-to choice for machinists running high-speed finishing and roughing passes across a broad range of workpiece materials.

This end mill is suited for CNC machining centers and manual mills working in steel, stainless steel, cast iron, high-temperature alloys, and hardened materials. Its centercutting design allows plunge entry, making it useful in pocketing, slotting, profiling, and ramping operations. The variable index flute spacing is particularly effective when surface finish and vibration control are priorities. Regular-length geometry fits standard tool holders without extended-reach adapters in most setups.

Key Features

• AlTiN coating provides oxidation resistance and extended tool life in ferrous and high-temp alloys
• 360 variable helix (36-39 degrees) reduces harmonic vibration and improves chip flow
• Variable index flute spacing minimizes chatter during aggressive cuts
• Centercutting capability allows direct plunge entry for pocketing operations
• Solid carbide KCPM15 substrate delivers edge retention in hardened and abrasive materials
• Right-hand cut, right-hand flute configuration for standard CNC spindle direction

Compatibility

Designed for use in standard 0.25-inch tool holders and collet systems. Rated for primary workpiece materials including steel (P), stainless steel (M), cast iron (K), high-temperature alloys (S), and hardened materials (H) per ISO material classification. Part of the KENNAMETAL H1TE series.

Installation Notes

Installation should be performed by a qualified machinist following shop safety procedures. Ensure the spindle is fully stopped and machine is in an E-stop or locked-out state before loading or unloading the tool. Use a properly sized collet or end mill holder rated for 0.25-inch shank diameter and torque the retention knob to the tool holder manufacturer specification. Verify runout with a dial indicator before production cutting to protect edge integrity and workpiece quality.