Hertel 84213727 Roughing End Mill 1/4 in 4 Flute Cobalt

Product Description

The HERTEL 84213727 is a single-end roughing end mill engineered for aggressive material removal in milling operations. Built from M42 cobalt high-speed steel, it carries a TiCN coating that extends tool life in ferrous and abrasive materials. The coarse pitch flute geometry — with 4 flutes arranged for right-hand cutting and right-hand flute direction — breaks chips aggressively and reduces heat buildup during heavy cuts. The 0.25 inch mill diameter and 1.25 inch length of cut make this tool well suited to slot milling, profiling, and roughing passes where cycle time matters more than surface finish. Licensed machinists and tool-and-die professionals are the primary users of this cutter.

This roughing end mill is designed for use in CNC machining centers, knee mills, and manual milling machines where a 3/8 inch straight shank can be held in a collet or end mill holder. The non-center-cutting geometry means it is intended for side milling and peripheral cuts rather than plunge entry. It performs in a wide range of ferrous materials including alloy steels, stainless steels, and tool steels where the M42 cobalt substrate and TiCN coating provide thermal resistance and wear protection.

Key Features

• M42 cobalt high-speed steel substrate for elevated red hardness and wear resistance
• TiCN coating reduces friction and extends tool life in abrasive materials
• Coarse pitch, 4-flute roughing geometry for efficient chip evacuation and fast material removal
• Right-hand cut, right-hand flute direction for standard spindle rotation
• Non-center-cutting single-end design — suited for peripheral and slot milling
• 3/8 inch shank diameter accommodates common collet and end mill holder sizes

Compatibility

Designed as an OEM-style replacement or direct-use roughing end mill for milling machines and machining centers that accept a 3/8 inch straight shank end mill holder or collet.

Installation Notes

This cutter is installed by a qualified machinist using an appropriate collet or end mill holder rated for the 3/8 inch shank. Ensure the machine spindle is fully stopped and locked out before changing tooling. Verify runout with a dial indicator after tool installation, as excessive runout accelerates edge wear on roughing geometry. This tool is not designed for plunge cutting — use a center-cutting end mill for plunge entry moves.