Hertel GG99914140 Square End Mill 3/4 in 4 Flute Hss

Product Description

The HERTEL GG99914140 is a 4-flute square end mill designed for general-purpose milling operations in ferrous and non-ferrous metals. Manufactured from M7 high speed steel in a bright, uncoated finish, it features a 30-degree right-hand spiral helix and a 3/4-inch cutting diameter with a matching 3/4-inch shank diameter. The centercutting geometry allows this tool to plunge directly into the workpiece, supporting slot milling, pocket milling, and peripheral cutting without a pre-drilled entry hole. Overall length is 3 inches with a 3/4-inch length of cut. This tool is intended for use by machinists and toolroom professionals operating manual or CNC milling machines.

This end mill is suited for light-to-medium duty milling applications in job shops, maintenance shops, and production environments. The regular-length configuration makes it a standard workhorse for face milling, contouring, and slotting operations. The M7 HSS material grade provides good toughness and wear resistance at moderate cutting speeds, making it appropriate for materials such as low-carbon steels, aluminum, brass, and similar workpiece materials encountered in general machining work.

Key Features

• Centercutting design allows direct plunge entry without a pilot hole
• M7 high speed steel construction for toughness in general machining applications
• 30-degree right-hand spiral helix for efficient chip evacuation
• 4-flute configuration provides good surface finish and feed rate capability
• Bright, uncoated finish — compatible with re-sharpening and standard cutting fluids
• Right-hand cutting direction suitable for conventional milling machine spindles

Compatibility

Designed as a standard 3/4-inch shank square end mill for use in milling machine collets, end mill holders, and toolholders accepting 3/4-inch straight shanks.

Installation Notes

Installation and operation should be performed by a qualified machinist familiar with milling machine setup and toolholder torque procedures. Ensure the machine spindle is fully stopped and locked out before changing tooling. Secure the shank fully within the holder to the recommended engagement depth and verify runout before beginning a cut. Always apply appropriate cutting fluid for the workpiece material and observe manufacturer feed and speed recommendations for HSS tooling.