Hertel E299921169 Square End Mill 7/16 in 4 Flute Hss

Product Description

The HERTEL E299921169 is a 4-flute square end mill designed for general-purpose milling operations in ferrous and non-ferrous metals. Built from M42 high speed steel, it delivers the hardness and heat resistance needed for demanding cutting environments. The 7/16 inch diameter cutter features a 30-degree helix angle and right-hand spiral flutes that promote efficient chip evacuation and smooth surface finishes. At 2-3/4 inches length of cut and 4-1/2 inches overall length, it handles slotting, profiling, and peripheral milling in a wide range of workpiece depths. The bright, uncoated finish suits applications where coating interaction with the workpiece is a concern.

This end mill is suited for use in manual mills, CNC machining centers, and knee mills across job shop, toolroom, and production environments. The 3/8 inch shank fits standard ER and side-lock toolholders common to most vertical milling setups. Centercutting capability allows plunge entry directly into the workpiece without a pre-drilled hole, making it versatile for die work, mold work, and general metalworking operations. It is installed and used by machinists and toolroom technicians working in both production and prototype applications.

Key Features

• M42 high speed steel construction for improved hot hardness and wear resistance
• 4-flute spiral design with 30-degree right-hand helix for efficient chip flow
• Centercutting geometry allows direct plunge entry into the workpiece
• Bright, uncoated finish suitable for a broad range of materials
• 3/8 inch shank compatible with standard ER collet and side-lock toolholders
• Right-hand cutting direction for use in conventional milling setups

Compatibility

Designed as a direct-fit replacement for standard 3/8 inch shank, 4-flute square end mills used in vertical milling machines, knee mills, and CNC machining centers equipped with ER or side-lock toolholding systems.

Installation Notes

Installation is performed by a machinist or toolroom technician. The machine spindle must be fully stopped and the toolholder secured in a vise or tool-change station before inserting or removing the end mill. Confirm shank engagement depth meets toolholder manufacturer minimums before tightening. Inspect the collet or holder bore for chips and runout before use, as excessive runout accelerates edge wear and reduces surface finish quality.