Hertel E2039048 Square End Mill 3/4 in 4 Flute Cobalt

Product Description

The HERTEL E2039048 is a 4-flute cobalt square end mill designed for milling ferrous and tough alloy materials in machining center and manual mill applications. Built from M42 cobalt high-speed steel, it delivers heat resistance and edge retention that standard HSS tooling cannot match in demanding cuts. Key dimensions are 0.75 inches cutting diameter, 1.625 inches length of cut, 0.75 inches shank diameter, and 3.875 inches overall length. The 30-degree right-hand spiral flute geometry promotes efficient chip evacuation and smooth side-wall finishes. This uncoated end mill is installed and used by machinists and tool-and-die professionals in production and job-shop environments.

This end mill suits general-purpose square shoulder milling, slotting, and profiling in steel, stainless, cast iron, and similar materials where cobalt tooling is the standard specification. The centercutting design allows direct plunge entry without a pilot hole, supporting both ramping and straight-plunge toolpaths. Its regular-length classification fits standard toolholders and collet chucks without extended-reach adapters. Shops running older Bridgeport-style knee mills and modern CNC machining centers alike commonly stock this profile for versatility across multiple setups.

Key Features

• M42 cobalt construction for elevated heat resistance and longer tool life in ferrous materials
• 4-flute configuration balances material removal rate with chip clearance in slotting and profiling operations
• 30-degree right-hand helix promotes smooth cutting action and effective chip evacuation
• Centercutting geometry permits direct plunge milling without a pre-drilled entry point
• Uncoated finish allows straightforward resharpening by a standard tool grinding service
• Matched 0.75-inch shank and cutting diameter for direct collet or end mill holder fitment

Compatibility

Designed as an OEM-style replacement or direct-use end mill for standard 3/4-inch end mill holders, ER collet chucks, and Weldon-style side-lock holders used across conventional and CNC milling platforms.

Installation Notes

Installation is performed by a qualified machinist or toolroom technician. Ensure the spindle is fully stopped and the machine is powered down before changing tooling. Seat the shank fully into the holder to the recommended engagement depth and torque set screws or collet nuts per the toolholder manufacturer specifications. Verify runout with a dial indicator before commencing cuts to prevent premature edge wear or tool failure.