Hertel E2039909 Square End Mill 7/8 in 4 Flute Cobalt

Product Description

The HERTEL E2039909 is a square end mill designed for material removal and profile milling in a wide range of machining applications. Built from M42 cobalt high-speed steel, it delivers heat and wear resistance that suits harder workpiece materials and interrupted cuts where carbide may be at risk. The cutter runs a 0.875-inch mill diameter with a 1.875-inch length of cut, giving machinists adequate reach for most standard-depth slotting and peripheral milling operations. Four spiral flutes with a 30-degree helix angle promote efficient chip evacuation and smooth cutting action. The uncoated finish makes it straightforward to resharpen when the edge dulls.

This end mill is suited to job shop and production environments running conventional machining centers, knee mills, or manual mills. It is a centercutting tool, allowing direct plunge entry into the workpiece without a pre-drilled hole. The right-hand cut and right-hand flute configuration is the standard setup for conventional spindle operation. The regular-length geometry keeps deflection manageable in general-purpose milling of steel, stainless steel, cast iron, and similar ferrous materials.

Key Features

• M42 cobalt HSS construction for elevated red hardness and toughness in demanding cuts
• Four spiral flutes with 30-degree helix angle for efficient chip flow and smooth finish
• Centercutting design permits direct plunge milling without a pilot hole
• Right-hand cut, right-hand flute — standard configuration for conventional spindle use
• Uncoated surface allows straightforward reconditioning and resharpening
• Regular length geometry limits deflection during slotting and peripheral passes

Compatibility

Designed as a standard square end mill for use in milling machines, machining centers, and CNC mills accepting a 0.75-inch shank diameter tool holder, collet, or end mill adapter.

Installation Notes

Installation and tool changes should be performed with the machine spindle fully stopped and locked out per applicable machine-guarding procedures. Seat the 0.75-inch shank fully and evenly in the tool holder before tightening to prevent runout. Verify tool stick-out is minimized to reduce chatter, and confirm spindle speed and feed rate are appropriate for the workpiece material and depth of cut before initiating the cut cycle.