Accupro 12178945 Square End Mill 5/16 in 3 Flute Solid Carbide

Product Description

The ACCUPRO 12178945 is a solid carbide square end mill designed for precision milling operations in metal fabrication, tool shops, and production machining environments. Built from micrograin solid carbide, this single-end tool features a 5/16 inch cutting diameter, a 1 inch length of cut, and a 4 inch overall length. The nACRo finish provides enhanced wear resistance and lubricity, making it well suited for cutting harder workpiece materials at elevated speeds. Three spiral flutes at a 40-degree helix angle promote efficient chip evacuation and reduce cutting forces during slotting, profiling, and peripheral milling. Centercutting geometry allows plunge entry directly into the workpiece.

This end mill is intended for use in CNC machining centers, knee mills, and manual milling machines where a 5/16 inch shank is appropriate. The right-hand cut and right-hand flute configuration matches the standard spindle rotation of most vertical milling setups. It is well suited for ferrous and non-ferrous materials where a tight diameter tolerance and consistent finish are required. Machinists, tool and die makers, and production CNC operators are the primary users of this tool class.

Key Features

• Micrograin solid carbide construction for rigidity and wear life
• nACRo coating for improved hardness and heat resistance at the cutting edge
• 40-degree helix angle with spiral flutes for aggressive chip evacuation
• Centercutting design allows direct plunge milling without a pilot hole
• Right-hand cut and right-hand flute for standard CNC spindle compatibility
• Mill diameter tolerance of plus 0.000 / minus 0.002 inches for close-tolerance work

Compatibility

Designed as an OEM-style replacement or direct-use solid carbide square end mill for standard 5/16 inch collet or end mill holder tooling systems on vertical milling machines and CNC machining centers.

Installation Notes

Installation should be performed by a qualified machinist or CNC operator. Ensure the machine spindle is fully stopped and the tool holder is clean and free of debris before seating the shank. Use a calibrated torque wrench and appropriate collet or end mill holder rated for the 5/16 inch shank diameter. Confirm runout with a dial test indicator before initiating a cut to protect both the tool and the workpiece.