Cleveland C33301 Ball End Mill 0.25 in 4 Flute Hss

Product Description

The CLEVELAND C33301 is a single-end ball end mill designed for finishing operations in ferrous and cast iron workpieces. Built from high speed steel (HSS) with an uncoated surface, it features a 0.25 inch milling diameter, a 0.625 inch length of cut, and a 4-flute configuration with a 30-degree right-hand spiral helix. The 3/8 inch shank fits standard milling chucks and collets. At 2.4375 inches overall length, the C33301 belongs to the HG-4B series and is intended for right-hand cutting direction. Machinists and toolroom operators use this mill for contour work, radius profiling, and finish passes where surface quality is the priority.

This ball end mill is suited for use in vertical machining centers, knee mills, and CNC milling setups where a regular-length tool is appropriate. Primary workpiece materials include steel and cast iron. The uncoated HSS construction makes it a practical choice for lower-speed finishing cuts where regrinding is part of the shop workflow. No coolant-through capability is present, so flood or mist coolant is applied externally at the cut zone.

Key Features

• 0.25 inch ball end milling diameter for fine contour and radius work
• 4-flute spiral design supports smooth chip evacuation during finishing passes
• 30-degree right-hand helix angle for stable cutting action in steel and cast iron
• High speed steel construction allows regrinding to extend tool life
• Single-end configuration with 3/8 inch shank for broad collet and chuck compatibility
• Regular length (2.4375 inches OAL) minimizes deflection in standard setups

Compatibility

Designed as an OEM-style replacement and standard tooling option for milling applications in steel and cast iron where a 0.25 inch diameter, 4-flute HSS ball end mill with a 3/8 inch shank is specified.

Installation Notes

Installation is performed by a machinist or toolroom technician. The machine spindle must be fully stopped and the tool holder de-energized before inserting or removing the end mill. Seat the 3/8 inch shank fully in a matching collet or end mill holder and torque the retention mechanism per the tool holder manufacturer specification. Verify runout after installation before beginning the cut cycle.