Hertel E4039016 Square End Mill 1/4 in 4 Flute Cobalt Tin

Product Description

The HERTEL E4039016 is a 4-flute cobalt square end mill designed for milling operations that require durability and heat resistance. Built from M42 cobalt high-speed steel, this tool carries a titanium nitride (TiN) finish that extends tool life in abrasive and harder materials. The single-end, center-cutting design allows for both peripheral and plunge cutting. With a 30-degree spiral helix angle and right-hand cut and flute configuration, it produces consistent chip evacuation and smooth surface finishes. Machinists and tool-and-die professionals select this end mill for demanding milling applications where standard HSS tooling falls short.

This end mill is suited for use in vertical and horizontal milling machines, CNC machining centers, and manual knee mills. It handles slotting, profiling, and light plunge cuts in steel, alloy steel, cast iron, and similar ferrous materials. The 1/4 inch cutting diameter and 3/8 inch shank diameter make it a practical choice for finishing passes and detail work in moderate-depth pockets. It is sold individually and is appropriate for job shops, tool rooms, and production environments requiring precision cutting in tighter geometries.

Key Features

• M42 cobalt construction for improved heat and wear resistance over standard HSS
• TiN coating extends tool life in abrasive and harder ferrous materials
• Center-cutting design allows direct plunge entry without pre-drilling
• 30-degree helix angle promotes efficient chip evacuation and reduced cutting forces
• Right-hand cut, right-hand flute configuration compatible with standard spindle rotation
• Regular-length geometry suits general-purpose milling without excessive overhang

Compatibility

Designed as a direct-fit replacement or standard addition for milling machines and CNC machining centers accepting a 3/8 inch shank diameter. Suitable for use with standard ER collet chucks, end mill holders, and Weldon-style tool holders sized for 3/8 inch shanks.

Installation Notes

Installation should be performed by a qualified machinist following the machine tool manufacturer's tool-holding specifications. Ensure the spindle is fully stopped and the machine is powered down before changing tooling. Secure the shank to the specified engagement depth in the tool holder and verify runout before beginning cuts. Follow applicable workplace safety standards for rotating cutting tools, including proper guarding and chip containment.