Hertel E1051021 Square End Mill 21/64 in 4 Flute Hss

Product Description

The HERTEL E1051021 is a double-end square end mill manufactured from M7 high speed steel. It features a 21/64-inch (0.3281-inch) cutting diameter, a 3/4-inch length of cut, and a 3/8-inch shank diameter, with an overall length of 3-1/2 inches. The four-flute spiral design with a 30-degree right-hand helix delivers efficient chip evacuation during milling operations. This tool is uncoated and follows a right-hand cut and right-hand flute configuration. At 0.05 pounds, it is a lightweight tool suited for precision work in a machine shop or production environment. Licensed machinists and tool-and-die professionals are the primary users.

This end mill is suited for general-purpose milling operations including slotting, profiling, and peripheral milling in ferrous and non-ferrous materials. The regular length designation makes it appropriate for standard-depth cuts in vertical mills, CNC machining centers, and knee mills. The double-end configuration allows two usable cutting ends, extending tool life between changes. Note that this end mill is not centercutting, so it is not suitable for direct plunge cuts into solid material without a pre-drilled entry point.

Key Features

• M7 high speed steel construction for durability in general-purpose milling applications
• Double-end design provides two usable cutting ends per tool
• 30-degree right-hand spiral helix promotes smooth chip flow and reduced cutting forces
• Uncoated finish — compatible with a wide range of cutting fluids and lubricants
• Four-flute configuration balances chip clearance with surface finish quality
• Regular length type suits standard-depth slotting and profiling operations

Compatibility

Designed as an OEM-style replacement or direct-use end mill for 3/8-inch collets or end mill holders in vertical mills, CNC machining centers, and similar equipment requiring a 3/8-inch shank tool with a 21/64-inch cutting diameter.

Installation Notes

Installation should be performed by a qualified machinist following standard tool-holding procedures. Ensure the machine spindle is fully stopped and the machine is locked out before changing tooling. Seat the shank fully and evenly in the collet or end mill holder and torque the retention hardware to the tool holder specifications. Because this end mill is not centercutting, avoid direct plunge milling into solid stock without a pre-drilled hole or ramping entry strategy.