Hertel 84512748 Roughing End Mill 1/4 in 4 Flute Cobalt M42

Product Description

The HERTEL 84512748 is a single-end cobalt roughing end mill designed for aggressive material removal in milling applications. Built from M42 cobalt high-speed steel, this tool handles tough ferrous metals and heat-resistant alloys that standard HSS tooling struggles with. The 1/4-inch diameter cutter has 4 flutes with a fine-pitch wave-form profile that breaks chips into smaller pieces, reducing cutting forces and heat buildup during heavy roughing passes. It ships with a bright, uncoated finish and a right-hand cutting direction. Licensed machinists and toolroom professionals install this end mill in vertical machining centers, manual knee mills, and CNC milling machines requiring a 3/8-inch collet or end-mill holder.

This end mill suits production shops and maintenance toolrooms that rough-cut steel, stainless, and cobalt-nickel alloys where extended tool life under heat is a priority. The 1-1/4-inch length of cut allows sufficient axial engagement for full-depth slotting and peripheral milling on small-profile workpieces. The 3/8-inch shank diameter is a common size accommodating standard ER collets and Weldon-style holders used across most shop-floor setups. It is a single-end design, meaning once the cutting end is worn, the tool is replaced rather than reversed.

Key Features

• M42 cobalt HSS construction for elevated hot hardness and wear resistance compared to standard M2 HSS
• Fine-pitch wave-form roughing profile reduces cutting forces and improves chip evacuation
• 4-flute, right-hand cut with right-hand helix for compatibility with conventional milling setups
• Center-cutting geometry allows plunge entry without a pre-drilled hole
• Bright, uncoated finish suitable for use with cutting oils and soluble coolants
• 3/8-inch shank fits standard ER collets, Weldon holders, and end-mill arbors

Compatibility

Designed as an OEM-style replacement or standard-stock roughing end mill for use in any milling machine or machining center equipped with a 3/8-inch tool-holding system.

Installation Notes

Install in a properly sized collet or Weldon-style end-mill holder and torque the retention fastener according to the toolholder manufacturer specifications. Ensure the spindle is fully stopped and locked before changing tooling. Inspect shank and collet bore for chips or damage before seating the tool, as contamination affects runout and tool life. Follow shop-established feeds and speeds for cobalt tooling in the specific workpiece material being cut.