Cleveland C42780 Ball End Mill 0.1875 in 4 Flute Cobalt

Product Description

The CLEVELAND C42780 is a single-end cobalt ball end mill designed for finishing operations in metalworking applications. Built from M42 cobalt high-speed steel, it delivers heat and wear resistance suited to demanding materials. The ball-nose geometry produces contoured and profiled surfaces in a single pass. At 0.1875 inches in diameter with a 0.5-inch length of cut, this tool is sized for fine detail work where precision matters. A 30-degree helix angle promotes smooth chip evacuation and reduces cutting forces. Licensed machinists and tool-and-die professionals are the primary installers of this end mill series.

This end mill is intended for finishing passes on stainless steel and steel workpieces in both manual and CNC milling setups. The 4-flute spiral configuration and uncoated M42 cobalt construction make it a practical choice for shops that require consistent surface finish on ferrous alloys. The 3/8-inch shank diameter fits standard collets and end mill holders found on vertical machining centers and knee mills. The regular-length profile keeps deflection low in confined pockets and contoured geometry work.

Key Features

• M42 cobalt construction for elevated heat resistance on stainless steel and alloy steels
• Ball-nose geometry for contoured surface finishing and profiling
• 30-degree helix angle promotes smooth chip flow and reduced cutting pressure
• 4-flute spiral design supports fine surface finish at finishing feed rates
• Single-end configuration with right-hand cut and right-hand flute direction
• Uncoated finish — compatible with coolant flood applications standard to most shop setups

Compatibility

Designed for use in standard 3/8-inch collets and end mill holders on CNC vertical machining centers and conventional knee mills. Primary workpiece materials are stainless steel and steel. Part of the Cleveland HGC-4B series.

Installation Notes

Installation and tool changes must be performed with the machine spindle fully stopped and the control in a safe state. Secure the shank in a properly sized collet or end mill holder torqued to the machine manufacturer's specification. Confirm runout with a dial indicator before beginning a finishing pass. This tool is intended for finishing operations — avoid using it as a roughing tool, as doing so may accelerate wear on the ball-nose geometry.