Cleveland C41390 Square End Mill 1/2 in 4 Flute Hss

Product Description

The CLEVELAND C41390 is a 4-flute, single-end square end mill designed for precision milling in ferrous and non-ferrous applications. Manufactured from high speed steel (HSS), it features a 1/2-inch cutting diameter with a 2-inch length of cut and a 5-inch overall length, placing it in the extra-long category. The 30-degree helix angle and spiral flute geometry promote efficient chip evacuation and smooth cutting action. Right-hand cut and right-hand flute orientation are standard. The centercutting design allows plunge entry, expanding its range of useful operations. This tool is installed and run by machinists and tool-and-die professionals on manual or CNC milling equipment.

The C41390 belongs to the HG-4C series and is suited for milling cast iron, non-ferrous metals such as aluminum and copper alloys, and steel. The extra-long configuration makes it appropriate for deep-pocket milling, slotting, and side milling operations where standard-length end mills cannot reach the full depth of cut. The straight-cylindrical shank with Weldon flat accommodates standard end mill holders and set-screw style toolholders commonly found in production and job-shop environments.

Key Features

• 4-flute spiral geometry with 30-degree helix angle for balanced chip load and surface finish
• Centercutting design enables plunge milling and slot entry without a pre-drilled hole
• Extra-long 2-inch length of cut for deep-pocket and deep-slot applications
• High speed steel construction provides toughness and re-sharpenability
• Right-hand cut, right-hand flute configuration suits standard CNC and manual spindle rotation
• Straight-cylindrical shank with Weldon flat for secure toolholder seating
• Uncoated finish — compatible with re-coating or use as-ground

Compatibility

Designed for use in milling cast iron, non-ferrous metals, and steel. Compatible with standard 1/2-inch end mill holders and Weldon-flat set-screw toolholders. Part of the CLEVELAND HG-4C series of extra-long square end mills.

Installation Notes

Installation is performed by a qualified machinist. Before mounting, verify the toolholder bore is clean and free of chips or burrs that could affect runout. Torque the set screw against the Weldon flat securely before spindle engagement. Follow the machine tool manufacturer's guidelines for maximum RPM and feed rates appropriate to the workpiece material and depth of cut.