Hertel GG99914153 Ball End Mill 5/16 in 4 Flute Hss

Product Description

The HERTEL GG99914153 is a single-end ball end mill designed for milling contoured surfaces, slots, and three-dimensional profiles in metalworking applications. Manufactured from M7 high speed steel with a bright/uncoated finish, it features a 5/16-inch (0.3125-inch) cutting diameter and a 1-inch length of cut. The 4-flute, right-hand spiral configuration with a 30-degree helix angle delivers efficient chip evacuation and smooth surface finishes. This tool is used by machinists and tool-and-die professionals in manual and CNC milling operations.

This ball end mill suits light-to-medium-duty milling tasks in job shops, maintenance machining, and production environments. Its M7 high speed steel construction makes it appropriate for cutting mild steels, aluminum, brass, and similar materials at moderate speeds. The 3/8-inch shank diameter provides a secure grip in standard collets and end mill holders. The 2-3/4-inch overall length offers adequate reach for most conventional setups without compromising rigidity.

Key Features

• M7 high speed steel construction for toughness and wear resistance in ferrous and non-ferrous materials
• 4-flute, right-hand spiral design with 30-degree helix angle for efficient chip removal
• Ball nose geometry for profiling, contouring, and 3D surface milling
• Bright/uncoated finish — suitable for use with or without cutting fluids
• Single-end configuration with 3/8-inch shank diameter for standard toolholders
• No extended reach or variable helix — straightforward, rigid setup

Compatibility

Designed as a standard single-end ball end mill compatible with 3/8-inch collets, end mill holders, and milling chucks used in conventional and CNC vertical milling machines.

Installation Notes

Installation should be performed by a qualified machinist with the spindle fully stopped and the machine in a locked-out state before tool changes. Ensure the shank is fully seated in the collet or holder to the recommended engagement depth and that the toolholder is properly torqued per the machine manufacturer's specifications. Verify runout with a dial indicator before beginning a cut. Consult the machine tool manual for recommended speeds and feeds based on workpiece material.