Accupro 12178983 Square End Mill 27/64 in 4 Flute Carbide

Product Description

The ACCUPRO 12178983 is a solid carbide square end mill designed for precision milling operations in metal cutting applications. With a 27/64 inch (0.4219 inch) mill diameter and a 1 inch length of cut, this four-flute tool delivers rigidity and chip clearance suited for finishing and semi-finishing passes. The nACRo coating improves wear resistance and heat tolerance at the cutting edge. A 40-degree helix angle promotes smooth chip evacuation and reduces cutting forces across a range of workpiece materials. Licensed machinists and CNC operators in job shops, production facilities, and tool rooms are the primary users of this end mill.

This end mill is suited for milling slots, pockets, profiles, and contours in ferrous and non-ferrous materials. The 7/16 inch shank diameter and 2-3/4 inch overall length fit standard ER and side-lock toolholders found on vertical machining centers and CNC knee mills. The centercutting geometry allows plunge entry without a pre-drilled hole, adding setup flexibility. Right-hand cut and right-hand flute configuration match conventional spindle rotation on most CNC machining centers.

Key Features

• 27/64 inch (0.4219 inch) mill diameter with a tight tolerance of +0.000 / -0.002 inch
• Solid carbide micrograin substrate for hardness and edge retention
• nACRo finish for improved wear resistance and reduced heat buildup at the cutting edge
• 40-degree spiral flute helix for efficient chip evacuation and reduced cutting forces
• Centercutting design permits direct plunge entry into the workpiece
• Right-hand cut, right-hand flute — compatible with standard CNC spindle rotation

Compatibility

Designed as an OEM-style replacement or direct-fit end mill for standard 7/16 inch shank toolholders used in CNC vertical machining centers and manual knee mills.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Ensure the machine spindle is fully stopped and locked out before mounting or removing the tool. Seat the shank fully into the toolholder to the minimum insertion depth recommended by the toolholder manufacturer, and torque the retention hardware according to the toolholder specification. Inspect the cutting edges for chipping before each use and confirm runout with a dial indicator after mounting.