Cleveland C33388 Square End Mill 5/16 in 4 Flute Hss Tin

Product Description

The CLEVELAND C33388 is a 4-flute, single-end square end mill designed for material removal in ferrous and non-ferrous machining operations. Built from high speed steel with a titanium nitride (TiN) finish, it provides improved surface hardness and heat resistance compared to uncoated HSS tooling. The 5/16-inch cutting diameter pairs with a 3/8-inch straight-cylindrical shank (with Weldon flat), keeping the tool secure in standard end mill holders. A 30-degree helix angle and spiral flute geometry support chip evacuation across a range of feed rates. This tool is installed and run by machinists in job shop, production, and maintenance environments.

The C33388 is suited for milling cast iron, non-ferrous metals, and steel in light-to-medium duty applications. Its centercutting geometry allows plunge entry, making it viable for slot milling, profiling, and pocket operations without a pre-drilled entry point. The regular-length classification and 1-3/8-inch length of cut make it appropriate for general-purpose work where extended reach is not required. Right-hand cut and right-hand flute orientation are standard for conventional CNC and manual milling setups.

Key Features

• TiN coating improves surface hardness and extends tool life in steel and cast iron
• Centercutting design allows direct plunge milling without a pilot hole
• 30-degree helix angle promotes smooth chip flow and reduces cutting forces
• Weldon flat on shank prevents tool pullout under load
• 4-flute configuration balances chip clearance with surface finish quality
• Right-hand cut and right-hand flute — compatible with standard spindle rotation

Compatibility

Designed for use in standard end mill holders and collet chucks accepting a 3/8-inch straight shank. Primary workpiece materials are cast iron, non-ferrous metals, and steel. Part of the CLEVELAND HG-4C series of general-purpose high speed steel end mills.

Installation Notes

Installation should be performed by a qualified machinist familiar with milling tool setup and machine operation. Ensure the spindle is fully stopped and the machine is powered down before mounting or removing tooling. Verify shank seating depth and set screw engagement against the Weldon flat before initiating a cut. Always confirm feeds, speeds, and depth-of-cut parameters against the machine capability and workpiece material before running.