Accupro 12184256 Ball End Mill 0.4375 in 2 Flute Carbide

Product Description

The ACCUPRO 12184256 is a solid carbide ball end mill designed for precision milling operations in metal, composites, and hard materials. With a 0.4375 inch (7/16 inch) cutting diameter and a 3 inch length of cut, this tool handles deep-cavity profiling, contouring, and 3D surfacing work where standard-length end mills cannot reach. The 6 inch overall length places it in the extra-long category, giving machinists the reach needed for deep-pocket applications without sacrificing rigidity. A 40-degree helix angle promotes smooth chip evacuation and reduces cutting forces during aggressive passes. The micrograin carbide construction delivers consistent edge life across a range of workpiece materials.

This end mill suits CNC machining centers and manual mills running ferrous and non-ferrous materials in job shop, tool-and-die, aerospace, and mold-making environments. The extra-long reach makes it particularly well suited for deep rib milling, core and cavity work in injection molds, and contoured surface finishing where cutter length is a limiting factor. Single-end construction means the tool is replaced rather than flipped when one end wears.

Key Features

• 0.4375 inch (7/16 inch) ball nose cutting diameter for profiling and 3D contouring
• 3 inch length of cut provides deep-pocket reach in a single setup
• 6 inch overall length — extra-long designation for deep-cavity applications
• 40-degree right-hand helix promotes efficient chip evacuation and smooth cut feel
• Micrograin solid carbide substrate for extended edge retention and dimensional stability
• Uncoated finish allows direct use on a wide range of materials without coating compatibility concerns
• 2-flute, single-end design with right-hand cutting direction

Compatibility

Designed as a direct-fit replacement or standard tooling selection for CNC machining centers and manual milling machines accepting a 7/16 inch straight shank, with a shank diameter tolerance of -0.0001 to -0.0004 inches for consistent chuck and collet fit.

Installation Notes

Installation should be performed by a qualified machinist following shop safety procedures. Power down and lock out the spindle before inserting or removing the tool from the collet or end mill holder. Ensure the shank is fully seated to the minimum insertion depth recommended for the holder type to prevent pullout under load. Verify runout with a dial indicator before committing to a production pass, particularly given the extra-long reach, which amplifies deflection if overhang is excessive.