Accupro 12178991 Square End Mill 11/16 in 4 Flute Carbide

Product Description

The ACCUPRO 12178991 is a solid carbide square end mill designed for precision milling of ferrous and non-ferrous metals, hardened steels, and engineered alloys. Built from micrograin carbide, this centercutting tool features four spiral flutes with a 40-degree helix angle and an nACRo coating that reduces friction and extends tool life in demanding cutting environments. It carries an 11/16-inch (0.6875-inch) mill diameter, a 1-1/2-inch length of cut, and a 3/4-inch shank diameter, making it a solid choice for peripheral and plunge milling where a balanced combination of rigidity and reach is required. Machinists and toolroom operators rely on this geometry for consistent finish and dimensional accuracy across a range of materials.

This end mill is suited for use in CNC machining centers and manual mills where a right-hand cut, right-hand flute configuration is standard. The 40-degree helix promotes efficient chip evacuation and smooth cutting action, particularly useful in slotting, profiling, and contouring operations. The 4-inch overall length and 3/4-inch shank provide enough rigidity to minimize deflection during heavy passes. Typical applications include mold work, die machining, fixture fabrication, and general production milling across job shop and industrial environments.

Key Features

• Solid micrograin carbide construction for enhanced wear resistance and edge retention
• nACRo coating reduces heat buildup and extends tool life in abrasive materials
• 40-degree helix angle promotes smooth chip flow and reduced cutting forces
• Centercutting design allows direct plunge entry without a pre-drilled pilot hole
• Right-hand cut and right-hand flute configuration compatible with standard spindle rotation
• Tight mill diameter tolerance of +0.000 / -0.002 inches ensures dimensional consistency

Compatibility

Designed as a standard shank end mill for use in CNC machining centers, knee mills, and toolroom equipment accepting a 3/4-inch collet or end mill holder.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Always confirm spindle speed and feed rate are appropriate for the workpiece material and depth of cut before engaging the tool. Secure the shank fully in a clean, properly sized collet or end mill holder and torque the retention mechanism to the tool holder specification before operation. Inspect the cutting edges for chips or wear before each use and replace the tool if edge integrity is compromised.