Cleveland C42103 Square End Mill 0.25 in 2 Flute Hss

Product Description

The CLEVELAND C42103 is a double-end, two-flute square end mill manufactured from high speed steel (HSS). It cuts on both ends, extending tool life between sharpenings. The mill measures 0.25 inches in diameter with a 0.375-inch length of cut and a 0.375-inch straight cylindrical shank that also accepts a Weldon flat holder. Overall length is 2.875 inches, placing it in the stub length category. A 30-degree helix angle promotes efficient chip evacuation. The right-hand cut and right-hand spiral flute geometry suit general-purpose milling operations. This tool is center-cutting, allowing direct plunge entry without a pre-drilled hole.

The C42103 is suited for milling cast iron, non-ferrous metals, and steel in light to medium material removal applications. Its stub length classification means reduced overhang and improved rigidity in tight setups or shallow pockets. Machinists and tool-and-die professionals typically deploy this end mill on manual knee mills, CNC machining centers, and benchtop mills when working in the HD-2 series application range. The uncoated HSS construction makes it straightforward to resharpen in-house, which is common practice in job shops running small production runs or prototype work.

Key Features

• Double-end design doubles usable tool life before replacement
• Center-cutting geometry allows direct plunge milling without pre-drilling
• 30-degree helix angle promotes chip flow and reduces heat buildup
• Stub length reduces overhang for improved rigidity in shallow-pocket work
• Straight cylindrical shank with Weldon flat accepts standard end mill holders
• Uncoated HSS construction is resharpenable with standard grinding equipment

Compatibility

Designed for use on cast iron, non-ferrous metals, and steel workpieces. Compatible with standard 0.375-inch end mill holders and Weldon flat collet systems on manual mills and CNC machining centers.

Installation Notes

Installation should be performed by a qualified machinist following shop safety protocols. Ensure the machine spindle is fully stopped and locked out before securing or removing the end mill from the holder. Use a properly sized end mill holder or Weldon flat collet and torque the set screw to the holder manufacturer specification. Verify runout with a dial indicator before beginning the cut to avoid premature tool wear or workpiece damage.