Accupro 12182004 Square End Mill 21/64 in 3 Flute Carbide

Product Description

The ACCUPRO 12182004 is a solid carbide square end mill designed for precision milling operations in metal, composites, and engineered plastics. Built from micrograin carbide, it delivers tight tolerances and edge retention in demanding cutting environments. The 3-flute geometry with a 40-degree helix angle balances chip evacuation and surface finish, making it well-suited for both slotting and peripheral milling. At 0.3281 inches in diameter with a 0.875-inch length of cut, this is a regular-length tool suited for standard-depth milling work. Centercutting capability allows plunge entry without a pre-drilled hole. Right-hand cut and right-hand spiral flute orientation are standard for conventional CNC machining setups.

This end mill is a fit for machining centers, CNC mills, and manual knee mills where a small-diameter, short-reach tool is needed. Typical applications include finishing passes, light slotting, profiling, and contour milling in steel, aluminum, stainless, and similar materials. The 3/8-inch shank diameter fits standard ER collets and end mill holders common in both job shop and production environments. The uncoated micrograin carbide substrate is appropriate for dry or flood-coolant cutting of ferrous and non-ferrous materials.

Key Features

• Micrograin solid carbide construction for edge retention and dimensional stability
• 40-degree helix angle promotes smooth chip flow and reduces cutting forces
• 3-flute design balances material removal rate and surface finish quality
• Centercutting geometry allows direct plunge milling without a pilot hole
• Right-hand cut, right-hand flute — standard orientation for CNC and manual mills
• Mill diameter tolerance of +0.000 / -0.002 inches for consistent fit in close-tolerance work

Compatibility

Designed as an OEM-style solid carbide square end mill compatible with standard 3/8-inch end mill holders, ER collet chucks, and similar toolholding systems used in CNC and manual milling applications.

Installation Notes

Installation should be performed by a machinist or qualified CNC operator. Ensure the machine spindle is fully stopped and the tool changer or spindle is locked before mounting or removing the end mill. Verify collet or holder runout before cutting to protect both the tool and the workpiece. Follow the machine manufacturer and tooling guidelines for appropriate speeds and feeds based on workpiece material.