Hertel E299914039 Square End Mill 1-3/16 in 6 Flute Cobalt

Product Description

The HERTEL E299914039 is a 6-flute cobalt square end mill designed for milling operations in ferrous and high-temperature alloy workpiece materials. Built from M42 cobalt high-speed steel, it offers increased heat resistance and edge retention compared to standard M2 HSS tooling. The cutter features a 1.1875-inch diameter, a 1.5-inch length of cut, and a 30-degree helix angle with right-hand spiral flutes. Centercutting geometry allows both peripheral and plunge milling. The 0.75-inch shank fits standard ER and side-lock toolholders common in knee mills, CNC machining centers, and manual Bridgeport-style equipment. Machinists and tool-and-die professionals use this end mill for slotting, profiling, and pocketing operations.

This end mill is suited for general-purpose metalworking in job shops, maintenance machining, and production environments. Its regular-length geometry and 3.875-inch overall length make it a practical choice for accessible workpiece features that do not require extended reach tooling. The uncoated M42 cobalt construction performs well in steel, stainless steel, cast iron, and similar materials, particularly when cutting fluid or coolant is applied. Applications include slot milling, shoulder milling, and light ramp milling in both manual and CNC setups.

Key Features

• 1.1875-inch cutting diameter with 1.5-inch length of cut for slot and profile work
• 6-flute configuration increases feed rate capability and surface finish quality versus 4-flute designs
• M42 cobalt HSS material provides superior heat and wear resistance over standard M2 HSS
• 30-degree right-hand helix with right-hand cut for efficient chip evacuation
• Centercutting design permits direct plunge entry into the workpiece
• Uncoated finish suitable for use with cutting fluids across a range of ferrous materials

Compatibility

Designed as a direct-fit replacement or standard-stocking end mill for applications requiring a 0.75-inch shank, 1.1875-inch diameter, 6-flute cobalt square end mill in regular-length configuration.

Installation Notes

Installation is performed by qualified machinists using appropriate toolholders such as ER collet chucks or side-lock holders rated for the 0.75-inch shank diameter. Ensure the spindle is fully stopped and the machine is powered down before changing tooling. Confirm runout with a dial indicator after seating the tool, as excessive runout accelerates edge wear and reduces surface finish quality. Follow machine manufacturer guidelines and applicable shop safety procedures when operating milling equipment.