Hertel E1051027 Square End Mill 27/64 in 4-flute Hss

Product Description

The HERTEL E1051027 is a double-end, square-profile end mill designed for milling operations in metal fabrication and machining environments. Built from M7 high speed steel, it delivers consistent performance in ferrous and non-ferrous materials without a coating. The tool features a 27/64-inch (0.4219 inch) cutting diameter, a 1-inch length of cut, and a 30-degree helix angle with spiral fluting. The right-hand cut and right-hand flute configuration is the standard for conventional milling setups. Machinists and tool-and-die professionals use this end mill for profiling, slotting, and peripheral milling where tight tolerances and a clean square shoulder are required.

This end mill fits standard 1/2-inch collet or end mill holders and is suited for manual knee mills, CNC machining centers, and bridgeport-style machines running at appropriate speeds and feeds for HSS tooling. The regular-length designation and 4-1/8-inch overall length make it a practical choice for general-purpose work where extended reach is not needed. The double-end design provides two usable cutting ends, extending tool life between resharpening cycles. It is appropriate for job shops, maintenance machining, and production environments where M7 HSS tooling is specified.

Key Features

• M7 high speed steel construction for durability in a wide range of workpiece materials
• Double-end design provides two cutting ends per tool
• 30-degree helix angle with spiral fluting for efficient chip evacuation
• Right-hand cut and right-hand flute — standard orientation for conventional milling
• Uncoated finish — suitable for use with cutting fluids where HSS is preferred over carbide
• Non-centercutting geometry — intended for peripheral and slot milling, not plunge cutting

Compatibility

Designed for use in 1/2-inch end mill holders, collet chucks, or Weldon-style holders on manual and CNC milling machines. Compatible with machining setups that specify M7 high speed steel regular-length square end mills with a 27/64-inch cutting diameter.

Installation Notes

Installation should be performed by a qualified machinist following shop safety protocols. Ensure the machine spindle is fully stopped and the power is locked out before changing tooling. Secure the shank to the full depth recommended by the holder manufacturer to prevent pullout under cutting loads. Do not use this tool for plunge cutting, as the geometry is non-centercutting.