Hertel E299921162 Square End Mill 9/32 in 4 Flute Cobalt

Product Description

The HERTEL E299921162 is a cobalt square end mill designed for milling ferrous and abrasion-resistant materials on manual mills and CNC machining centers. Built from M42 cobalt high-speed steel, it offers greater heat and wear resistance than standard M2 HSS tooling, making it a reliable choice for interrupted cuts and harder workpiece materials. The cutter features a 9/32 inch (0.2813 inch) mill diameter, a 2 inch length of cut, and a 3/8 inch shank diameter. With four flutes and a 30-degree right-hand spiral helix, it balances material removal rate with surface finish. This is a single-end, bright uncoated tool suited for machinists and tool-and-die professionals working in job shops and production environments.

This end mill is used in face milling, slotting, profiling, and peripheral milling applications. The centercutting geometry allows plunge entry directly into the workpiece, adding versatility in multi-operation setups. The right-hand cutting direction is standard for conventional and climb milling on vertical machining centers and knee mills. It is appropriate for use on steel, stainless steel, cast iron, and similar materials where cobalt tooling is preferred over carbide when toughness against chipping is a priority. The 3-3/4 inch overall length provides sufficient reach for standard depth pockets while maintaining rigidity.

Key Features

• M42 cobalt HSS construction for superior heat resistance compared to M2 tooling
• 4 flutes with right-hand spiral at 30 degrees for efficient chip evacuation
• Centercutting design enables direct plunge entry without pre-drilling
• Bright uncoated finish suitable for use with cutting fluids or dry cutting depending on application
• 3/8 inch shank diameter fits standard collets and end mill holders
• Single-end configuration — one cutting end, full shank for secure clamping

Compatibility

Designed as a standard-shank replacement cobalt square end mill for use in 3/8 inch collets, end mill holders, and set-screw style holders on vertical mills and CNC machining centers.

Installation Notes

Installation should be performed by a qualified machinist. Always power down and lock out the machine spindle before changing tooling. Seat the shank fully into the holder to the minimum clamping depth recommended by the holder manufacturer, and confirm runout with a dial indicator before production cuts. Do not exceed the tool manufacturer's recommended speeds and feeds for the workpiece material and depth of cut.