Cleveland C42109 Ball End Mill 0.125 in 2 Flute Hss

Product Description

The CLEVELAND C42109 is a single-end ball end mill designed for finishing operations in ferrous and cast iron workpiece materials. Built from high speed steel with an uncoated finish, this tool features a 0.125-inch mill diameter, a 0.375-inch length of cut, and a 30-degree right-hand spiral helix. The 2-flute geometry promotes chip evacuation and suits contour milling, profiling, and slotting passes where a ball-nose profile is required. With an overall length of 2.3125 inches and a 0.375-inch shank diameter, it fits standard end mill holders and collet chucks in vertical mills and machining centers.

This end mill is suited for finishing passes on cast iron and steel components in job shop, tool-and-die, and general machining environments. The HG-2B series is a regular-length, single-end configuration intended for applications where tool reach is not the primary constraint and surface finish is the priority. It is appropriate for use in both manual knee mills and CNC vertical machining centers where a small-diameter ball nose profile is needed.

Key Features

• 0.125-inch ball nose diameter for fine detail and contour finishing
• 2-flute spiral design promotes chip clearance on steel and cast iron
• 30-degree right-hand helix for smooth cutting action
• High speed steel construction provides toughness across a range of steels
• Uncoated finish — compatible with standard cutting fluids and lubricants
• Single-end configuration with 0.375-inch shank for broad holder compatibility

Compatibility

Designed for use on primary workpiece materials including cast iron and steel. Fits standard 0.375-inch end mill holders, collet chucks, and side-lock holders used in vertical mills and CNC machining centers.

Installation Notes

Installation should be performed by a qualified machinist with the spindle fully powered down and locked out before tool changes. Ensure the shank is fully seated and the holder drawbar or collet nut is torqued per the holder manufacturer specifications. Verify runout with a dial indicator after clamping before beginning any cut. Select feeds, speeds, and depth of cut according to the workpiece material and machine rigidity — do not exceed the rated length of cut of 0.375 inches axially.