Cleveland C42078 Square End Mill 11/16 in 2 Flute Hss

Product Description

The CLEVELAND C42078 is a double-end, square-profile end mill designed for material removal in milling operations on machining centers and manual mills. Ground from high speed steel (HSS), it runs two right-hand spiral flutes at a 30-degree helix angle, producing a balance of chip evacuation and cutting edge strength. The centercutting geometry allows plunge entry directly into the workpiece without pre-drilling. With an 11/16-inch cutting diameter and a 1-5/16-inch length of cut, this tool is suited for slotting, profiling, and pocketing work where a regular-length reach is appropriate. A straight-cylindrical shank with a Weldon flat accepts standard end mill holders securely.

This end mill is intended for use on steel, cast iron, and non-ferrous metals in both production and job-shop environments. The Series HD-2 designation indicates a heavy-duty two-flute geometry optimized for full-slot cuts and applications requiring aggressive chip clearance. It is a regular-length tool appropriate for conventional machining setups where extended reach is not required. Machinists and CNC operators working on ferrous and non-ferrous workpieces will find it suited to roughing and semi-finishing passes in those material groups.

Key Features

• Double-end design doubles tool life before replacement
• Centercutting geometry allows direct plunge milling without a pilot hole
• 30-degree right-hand spiral flute promotes efficient chip evacuation
• Straight-cylindrical shank with Weldon flat for secure holder engagement
• Uncoated HSS construction compatible with standard cutting fluids and coolants
• Regular-length profile for rigid setups on standard milling fixtures

Compatibility

Designed as an OEM-style replacement or direct-use end mill for standard 3/4-inch straight-shank end mill holders used on vertical milling machines and machining centers. Primary workpiece materials are steel (P), cast iron (K), and non-ferrous metals (N) per ISO material group designations.

Installation Notes

Installation is performed by a machinist or CNC operator using a standard end mill holder torqued against the Weldon flat with an appropriate set screw wrench. Ensure the machine spindle is fully stopped and locked before loading or changing the tool. Inspect the shank and flutes for chips or damage before each use. Follow shop-standard speeds and feeds for HSS tooling in the workpiece material being cut.