Accupro 42419788 Ball End Mill 1/4 in 4 Flute Solid Carbide

Product Description

The ACCUPRO 42419788 is a single-end ball end mill designed for precision milling operations in ferrous and non-ferrous metals, stainless steel, and hardened workpiece materials. Built from solid carbide, it delivers the rigidity and wear resistance required for high-speed finishing and semi-finishing passes. The AlTiCrN coating provides thermal stability and oxidation resistance, extending tool life in demanding cut conditions. With a 1/4 inch mill diameter, a 0.2130 inch length of cut, and a 4-flute geometry featuring a variable index design, this end mill is suited for machinists and tool-and-die professionals running CNC mills and machining centers.

This end mill is used in shop environments where tight-tolerance 3D contouring, profiling, and slotting operations are required. The ball-nose geometry makes it well suited for finishing curved surfaces, mold cavities, and contoured part features. The 1/4 inch shank diameter fits standard ER collets and end mill holders commonly found in vertical machining centers and CNC routers. The single-end configuration is standard for tool change efficiency in production and prototype machining workflows.

Key Features

• Solid carbide construction for rigidity and extended tool life in hard and abrasive materials
• AlTiCrN coating provides oxidation resistance and thermal hardness at elevated cutting temperatures
• 4-flute, variable index geometry reduces harmonic vibration and improves surface finish
• Ball-nose tip geometry enables accurate 3D contouring and curved surface finishing
• Single-end design with 1/4 inch shank for compatibility with standard collet and tool holder systems
• 2.5 inch overall length provides reach for moderate-depth cavity and profile work

Compatibility

Designed for use in CNC machining centers and manual mills equipped with 1/4 inch collets or end mill holders. No specific machine model compatibility was stated in the product data.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Ensure the spindle is fully de-energized and locked out before loading or unloading the tool. Seat the shank fully into the holder to the recommended gauge line and torque the collet nut per the tool holder manufacturer specification. Verify runout with a dial indicator before initiating a cut, as excessive runout accelerates wear on carbide end mills and degrades surface finish.