Hertel GG99914179 Square End Mill 0.125 in 4 Flute Hss

Product Description

The HERTEL GG99914179 is a double-end square end mill designed for precision milling operations in metal and composite materials. Built from M7 grade high speed steel, it delivers reliable performance in general-purpose cutting applications. The tool features a 0.125 inch mill diameter, a 0.1875 inch length of cut, and a 30-degree helix angle with spiral flutes. With 4 flutes and right-hand cut and flute direction, it is suited for finish milling passes where consistent chip evacuation and surface quality matter. Machinists and tool-and-die professionals are the primary users of this end mill.

This end mill fits standard machining center setups and manual milling machines that accept a 0.375 inch shank diameter. The 2.75 inch overall length provides adequate reach for most workholding configurations without sacrificing rigidity. The uncoated M7 HSS construction makes it a practical choice for shops running lower-speed operations or machining softer materials where coating is not required. It is sold individually and is appropriate for both production and prototype work where a small-diameter, double-end tool reduces downtime from tool changes.

Key Features

• M7 grade high speed steel construction for general-purpose durability
• Double-end design extends usable tool life per unit
• 30-degree helix angle with spiral flutes for efficient chip evacuation
• 4-flute configuration suited for finish milling passes
• Right-hand cut and right-hand flute direction for standard spindle use
• Uncoated finish for compatibility with lower-speed machining setups

Compatibility

Designed as an OEM-style replacement or standard tooling option for milling machines and machining centers accepting a 0.375 inch shank diameter with ER or collet-style toolholders.

Installation Notes

Installation should be performed by a qualified machinist following standard toolholding procedures. Ensure the machine spindle is fully powered down and locked before inserting or removing the end mill from the collet or toolholder. Verify runout with a dial indicator after seating the shank to confirm proper alignment before cutting. Follow applicable shop safety standards and machine manufacturer guidelines for speed and feed selection with HSS tooling.