Accupro 12178978 Square End Mill 11/32 in 4 Flute Carbide

Product Description

The ACCUPRO 12178978 is a solid carbide square end mill designed for precision milling operations in metal, composites, and engineered plastics. Built from micrograin carbide stock, this center-cutting tool runs a 40-degree helix angle and a spiral flute geometry that promotes chip evacuation and reduces chatter at higher feed rates. The nACRo physical vapor deposition finish adds surface hardness and thermal resistance, extending tool life in demanding cuts. At 0.3437 inches in cutting diameter with a 7/8-inch length of cut, this end mill suits slotting, profiling, and plunge operations on CNC machining centers and manual mills. Machinists and tool-and-die technicians are the primary users.

This end mill fits production and job-shop environments where close-tolerance finishing passes or aggressive roughing cycles are required. The 3/8-inch shank diameter mounts directly into standard ER collet chucks, end mill holders, or shrink-fit toolholders. The 2-1/2-inch overall length keeps the tool rigid in shallow-to-moderate depth applications. Right-hand cut and right-hand flute geometry follow standard CNC spindle conventions. The extended reach feature is not present, confirming this is a standard-reach configuration appropriate for setups where minimizing stick-out is a priority.

Key Features

• Micrograin solid carbide construction for wear resistance and edge stability
• nACRo finish improves hardness and heat resistance at the cutting edge
• 40-degree helix angle promotes smooth cutting action and efficient chip removal
• Center-cutting design allows direct plunge entry without a pre-drilled pilot hole
• 4-flute spiral geometry balances material removal rate with surface finish quality
• Mill diameter tolerance of +0.000 / -0.002 inches ensures consistent dimensional accuracy

Compatibility

Designed as an OEM-style replacement or direct-fit solid carbide square end mill for standard 3/8-inch straight-shank toolholders used in CNC and manual milling applications.

Installation Notes

Installation is performed by machinists using an appropriate collet chuck, end mill holder, or shrink-fit toolholder rated for the 3/8-inch shank diameter. Ensure the spindle is fully stopped and the machine is in an e-stop or lockout-tagout state before inserting or removing the tool. Confirm shank seating depth meets the toolholder manufacturer minimum engagement specification before tightening. Inspect the cutting edges and coating for chips or damage prior to each use, particularly after interrupted cuts.