Accupro 12184931 Ball End Mill 0.25in 4 Flute Carbide

Product Description

The ACCUPRO 12184931 is a solid carbide ball end mill designed for precision milling of contoured surfaces, 3D profiles, and complex geometries. It features a 0.25 inch diameter with a 1 inch length of cut and a 4-inch overall length, classifying it as a long-length configuration. The four-flute, right-hand spiral design with a 40-degree helix angle promotes efficient chip evacuation and stable cutting action. The micrograin carbide substrate provides wear resistance suited to harder workpiece materials. The uncoated finish is appropriate for applications where coating compatibility with specific cutting fluids or materials is a consideration. Licensed machinists and CNC operators are the primary users of this tool.

This end mill is suited for CNC machining centers and manual milling machines performing finish and semi-finish passes on ferrous and non-ferrous materials. The long-length body allows access to deeper pockets, cavities, and stepped features that standard-length end mills cannot reach. The single-end configuration and right-hand cutting direction are standard for the majority of vertical and horizontal milling setups encountered in job shop and production environments.

Key Features

• 0.25 inch mill diameter with a mill diameter tolerance of +0.000 to -0.002 inches for consistent fit
• 1 inch length of cut provides adequate depth engagement for pocket and contour work
• 4-inch overall length — long-length classification for extended reach applications
• Four right-hand spiral flutes at a 40-degree helix angle for smooth chip flow
• Micrograin solid carbide construction for rigidity and edge retention
• Uncoated finish — compatible with a wide range of cutting fluid systems
• Single-end, right-hand cutting direction — standard for most CNC and manual mill setups

Compatibility

Designed as a direct-fit replacement or standard tooling addition for CNC machining centers and manual milling machines accepting a 0.25 inch shank diameter with standard collet, end mill holder, or set-screw holder interfaces.

Installation Notes

Installation is performed by qualified machinists or CNC setup technicians. The machine spindle must be fully stopped and locked out before changing tooling. Use a calibrated collet or end mill holder sized to the 0.25 inch shank diameter and verify runout with a dial indicator before beginning a cut. Shank diameter tolerance is -0.0001 to -0.0004 inches — select holders accordingly to ensure proper grip and minimize vibration.