Cleveland C33037 Square End Mill 21/64 in 4 Flute Hss

Product Description

The CLEVELAND C33037 is a double-end, four-flute square end mill from the HD-4C series, manufactured from high speed steel with a bright, uncoated finish. It features a 21/64 inch (0.3281 inch) cutting diameter, a 3/4 inch length of cut, and a 3-1/2 inch overall length with a 3/8 inch straight-cylindrical shank that also accepts a Weldon flat drive. The 30-degree right-hand helix and right-hand cutting direction promote efficient chip evacuation and clean edge geometry. Licensed machinists and toolroom operators use this end mill for general-purpose milling operations across a range of workpiece materials.

The C33037 is suited for milling cast iron, non-ferrous metals, and steel in both production and toolroom environments. Its regular-length profile and double-end configuration make it a practical choice for slotting, profiling, and peripheral milling on vertical mills, knee mills, and CNC machining centers where a compact, versatile end mill is required. The HD-4C series designation indicates a heavy-duty four-flute geometry intended for rigid setups with moderate to high material removal rates.

Key Features

• Double-end design doubles usable tool life before regrind or replacement
• Four-flute spiral geometry with 30-degree right-hand helix for efficient chip flow
• High speed steel construction provides toughness in interrupted cuts and harder workpieces
• Centercutting capability allows plunge entry without a pre-drilled hole
• Straight-cylindrical shank with Weldon flat accepts standard end mill holders and set-screw holders
• Bright, uncoated finish for use across cast iron, non-ferrous metals, and steel

Compatibility

Designed as an OEM-style replacement or direct equivalent for standard 3/8 inch shank end mill holders used in vertical mills, knee mills, and CNC machining centers. Suitable for primary workpiece materials including cast iron, non-ferrous metals, and steel.

Installation Notes

Installation should be performed by a qualified machinist following shop safety procedures. Always power down and lock out the spindle before changing tooling. Seat the shank fully into the end mill holder and tighten set screws to the holder manufacturer's specified torque before operation. Inspect the cutting edges for chips or damage before each use, and ensure proper coolant flow or air blast is established for the target material.