Hertel E2039012 Square End Mill 3/16 in 4 Flute Cobalt

Product Description

The HERTEL E2039012 is a cobalt square end mill designed for precision milling operations in ferrous and high-temperature alloy materials. Built from M42 cobalt high-speed steel, this tool offers improved heat resistance and edge retention compared to standard M2 HSS end mills. It runs a 4-flute, right-hand spiral configuration with a 30-degree helix angle and arrives uncoated, making it well suited for applications where coolant is used to manage heat. The 0.1875-inch cutting diameter and 0.5-inch length of cut are sized for slotting, peripheral milling, and finishing passes in tight-tolerance workholding setups. Centercutting geometry allows plunge entry without a pre-drilled hole.

This end mill fits standard machining center and manual milling machine spindles that accept a 0.375-inch straight shank. It is appropriate for job shop, toolroom, and production environments where operators are milling steel, stainless, cast iron, or similar materials at moderate to high cutting speeds. The regular-length configuration keeps the tool stiff and minimizes deflection at depth, which is critical when maintaining sidewall accuracy in slotting operations. A licensed machinist or CNC operator typically selects this tool for roughing and finishing passes where a coated carbide tool is not required or preferred.

Key Features

• M42 cobalt HSS construction for elevated heat resistance and longer tool life in ferrous materials
• 4-flute spiral design with 30-degree helix angle for smooth chip evacuation and surface finish
• Centercutting geometry allows direct plunge entry without a pilot hole
• Right-hand cut and right-hand flute orientation for standard spindle rotation
• Uncoated finish compatible with flood coolant and cutting oil applications
• Regular-length body reduces deflection and improves rigidity at the workpiece

Compatibility

Designed as an OEM-style replacement or direct-fit tooling option for any milling machine or machining center equipped with a 0.375-inch straight-shank tool holder, collet chuck, or end mill adapter.

Installation Notes

Installation is performed by a qualified machinist. Power down and lock out the machine spindle before loading or removing the tool from the holder. Ensure the shank is fully seated in the collet or end mill holder and that the set screw or collet nut is torqued to the tool holder manufacturer specification. Inspect the cutting edges for chipping before each use, and confirm correct spindle rotation direction before engaging the workpiece.