Hertel E299914107 Square End Mill 1/4 Inch 4 Flute Cobalt

Product Description

The HERTEL E299914107 is a cobalt square end mill designed for milling operations on ferrous and hard-to-machine materials. Built from M42 cobalt high-speed steel, it delivers heat resistance and edge retention that standard HSS tools cannot match at elevated cutting temperatures. The cutter features a 0.250 inch mill diameter, a 0.375 inch shank diameter, and a stub-length 0.250 inch length of cut, making it well suited for rigid setups where minimal overhang is preferred. Four spiral flutes with a 30-degree helix angle promote efficient chip evacuation while maintaining a strong core. Right-hand cut and right-hand flute geometry follow standard milling convention. The uncoated finish allows for easy regrinding and performance evaluation in a range of cutting fluids.

This end mill is suited for slot milling, profiling, and plunge cutting in general machining environments. The centercutting design enables direct plunge entry without a pre-drilled start hole, adding flexibility in pocketing and ramping applications. It is appropriate for use in CNC machining centers, manual knee mills, and benchtop milling machines across job shop, toolroom, and production floor settings. Machinists working with alloy steel, tool steel, stainless steel, cast iron, and similar tough materials will find the M42 substrate a practical choice over general-purpose HSS when extended tool life at higher feeds and speeds is needed.

Key Features

• M42 cobalt high-speed steel construction for heat resistance in hard and abrasive materials
• Four spiral flutes with 30-degree helix angle for efficient chip flow
• Centercutting design allows direct plunge entry
• Stub length of cut provides rigidity and reduces deflection in tight setups
• Uncoated finish supports easy regrinding and broad coolant compatibility
• Right-hand cut and right-hand flute geometry match standard milling spindle direction

Compatibility

Designed as a standard square end mill replacement for applications requiring a 0.250 inch diameter, 0.375 inch shank, stub-length cobalt end mill in right-hand spindle milling machines.

Installation Notes

Installation is performed by a machinist or toolroom technician. Secure the shank fully in a collet or end mill holder to the recommended engagement depth before tightening. Verify spindle direction is set to right-hand rotation before starting the cut. Inspect the tool holder for runout and ensure the machine is at a complete stop before changing or measuring the tool.