Hertel E2039980 Square End Mill 1 in 4 Flute Cobalt

Product Description

The HERTEL E2039980 is a single-end, square-profile cobalt end mill designed for milling operations on ferrous and high-temperature alloy materials. Built from M42 cobalt high-speed steel, it delivers the heat and wear resistance required for demanding cuts in tool steels, stainless, and work-hardening materials. The mill runs a 4-flute, spiral configuration with a 30-degree helix angle, balancing chip evacuation with surface finish quality. At 1 inch in diameter with a 3-inch length of cut, it handles deep-shoulder and full-width slotting passes that shorter reach tools cannot reach. Installation and operation are handled by machining professionals on manual and CNC milling equipment.

This end mill is suited for job shop and production floor applications where cobalt tooling is specified over carbide for interrupted cuts or rigid setups on conventional mills. The 1-inch shank diameter indexes directly into standard R8, CAT, BT, or equivalent toolholders without a reduction collet. The 5-1/2-inch overall length provides clearance for fixture-heavy setups and deep-pocket work. Right-hand cut and right-hand flute geometry follow standard milling convention, making it a straightforward drop-in for most horizontal and vertical milling operations.

Key Features

• M42 cobalt construction for elevated heat resistance and edge retention in tough materials
• 4-flute spiral design with 30-degree helix angle balances chip load and finish quality
• Centercutting geometry allows plunge entry directly into workpiece without pre-drilling
• Uncoated finish maintains sharpness regrindability and suits use with cutting fluids
• Right-hand cut and right-hand flute for standard milling machine spindle direction
• No chipbreaker and no extended reach — optimized for rigidity in standard LOC applications

Compatibility

Designed as an OEM-style replacement or standard stock end mill for use in 1-inch toolholding systems on vertical and horizontal milling machines requiring cobalt square-end geometry.

Installation Notes

Installation is performed by machinists or toolroom technicians on milling equipment. Ensure the spindle is fully stopped and machine is powered down before changing tooling. Torque the toolholder set screw or collet nut to the toolholder manufacturer specification. Verify runout with a dial indicator before commencing cuts, as excessive runout accelerates flute wear on cobalt tooling.