Cleveland C33040 Square End Mill 25/64 in 4-flute Hss

Product Description

The CLEVELAND C33040 is a 4-flute, double-end square end mill machined from high speed steel for use in general-purpose metal removal operations. It measures 25/64 inch (0.3906 inch decimal) in cutting diameter with a 1 inch length of cut and a 4-1/2 inch overall length. The 1/2 inch straight-cylindrical shank includes a Weldon flat for positive tool retention in standard end mill holders. A 30-degree helix angle promotes efficient chip evacuation, and the spiral flute geometry is designed for right-hand cut and right-hand flute direction. This tool is intended for use by machinists and tool-and-die professionals on manual mills, CNC machining centers, and knee mills.

The C33040 belongs to the Cleveland HD-4C series and is suited for milling operations on cast iron, non-ferrous metals, and steel. Its centercutting capability allows plunge entry directly into the workpiece without a pre-drilled pilot hole, making it practical for slot milling, profile milling, and step milling. The regular-length geometry fits standard toolholders and works in both job-shop and production environments where HSS tooling is preferred for its toughness and regrindability.

Key Features

• Double-end configuration extends tool life by providing two usable cutting ends
• Centercutting design allows direct plunge milling without a starter hole
• 30-degree helix angle for improved chip flow and reduced cutting pressure
• Weldon flat on 1/2 inch shank prevents tool pullout under load
• Uncoated high speed steel construction allows easy regrinding
• Right-hand cut and right-hand flute configuration for standard spindle rotation

Compatibility

Designed for use in standard 1/2 inch end mill holders and collet chucks on manual knee mills and CNC machining centers. Compatible workpiece materials include cast iron, non-ferrous metals, and steel per Cleveland series designation. Part of the HD-4C series.

Installation Notes

Installation is performed by qualified machinists following standard toolroom practice. Secure the shank fully into the holder with the Weldon flat engaged against the setscrew to prevent axial pullout. Ensure the spindle is completely stopped and machine is in a safe, locked-out state before changing tooling. Do not exceed the tool's rated length of cut when programming depth of engagement.