Hertel E299914029 Ball End Mill 0.25in 4 Flute Cobalt

Product Description

The HERTEL E299914029 is a cobalt ball end mill designed for milling contoured surfaces, slots, and three-dimensional profiles in ferrous and non-ferrous metals. Built from M42 cobalt high-speed steel, this single-end tool delivers strong heat and wear resistance at elevated cutting speeds. It features a 0.25 inch mill diameter, a 0.75 inch length of cut, and a 30-degree right-hand helix that promotes efficient chip evacuation. The uncoated finish makes it suitable for re-sharpening. This tool is typically specified by machinists and tool-and-die professionals working on manual mills and CNC machining centers.

This ball end mill is suited for profiling, contouring, and finish milling operations on steel, stainless, cast iron, and similar materials. The 4-flute spiral configuration provides a good balance between chip clearance and surface finish quality, making it a practical choice for both roughing passes in softer materials and finish work in harder alloys. The 3/8 inch shank diameter fits standard ER collets and end mill holders common to vertical machining centers and manual knee mills.

Key Features

• M42 cobalt HSS construction for elevated heat and wear resistance
• 4-flute spiral design balances chip evacuation and surface finish
• 30-degree right-hand helix promotes smooth cutting action
• Ball end profile for 3D contouring and radius floor milling
• Uncoated finish allows re-sharpening to extend tool life
• Single-end configuration with standard 3/8 inch shank for broad holder compatibility

Compatibility

Designed as an OEM-style replacement or direct-use cutting tool for standard end mill holders and ER collet systems accepting a 3/8 inch shank diameter.

Installation Notes

Installation of end mills should be performed by a qualified machinist following the machine tool manufacturer's torque and runout specifications for the holder type in use. Always power down and lock out the spindle before changing tooling. Verify shank engagement depth meets the holder manufacturer's minimum insertion requirement before tightening. Inspect the cutting edges for chips or damage before mounting to avoid surface finish issues or tool breakage during operation.