Accupro 12178976 Square End Mill 5/16 Inch 4 Flute Carbide

Product Description

The ACCUPRO 12178976 is a solid carbide square end mill designed for precision milling in metal, composite, and engineered material applications. It features a 5/16 inch cutting diameter, a 3/4 inch length of cut, and a 2-1/2 inch overall length with a matching 5/16 inch straight shank. The nACRo coating provides high heat resistance and extended tool life in demanding cutting conditions. The 40-degree spiral helix angle promotes efficient chip evacuation and reduces cutting forces. With four flutes and a centercutting geometry, this end mill handles both plunge and peripheral milling operations. It is installed by machinists and CNC operators in job shop and production environments.

This end mill is suited for use in vertical and horizontal milling machines, CNC machining centers, and manual mills where tight tolerances and smooth surface finishes are required. The regular-length configuration makes it well-suited for general-purpose slotting, profiling, and pocketing operations on ferrous and non-ferrous workpieces. Micrograin carbide construction maintains edge integrity at higher spindle speeds and feed rates compared to standard carbide grades.

Key Features

• Solid micrograin carbide construction for superior edge retention and rigidity
• nACRo coating for improved heat resistance and reduced tool wear in hard materials
• 40-degree helix angle promotes aggressive chip evacuation and smoother cuts
• Centercutting design allows direct plunge entry into workpiece material
• Right-hand cut and right-hand spiral flute configuration for standard milling setups
• Mill diameter tolerance of plus 0.000 / minus 0.002 inches for consistent dimensional accuracy

Compatibility

Designed as an OEM-style replacement or direct-fit option for standard 5/16 inch straight-shank toolholders, collets, and ER-style chucks used in CNC and manual milling machines.

Installation Notes

Installation is performed by qualified machinists or CNC technicians. Ensure the machine spindle is fully stopped and locked out before inserting or removing the end mill from the toolholder. Use a calibrated torque wrench and appropriate collet or end mill holder rated for the shank diameter. Inspect the cutting edges and coating for chips or wear before each use, and verify runout with a dial indicator after seating the tool.