Accupro 12276820 Square End Mill 0.043 in 4 Flute Carbide

Product Description

The ACCUPRO 12276820 is a solid carbide square end mill designed for precision milling operations in metal, composites, and engineered plastics. With a 0.043-inch cutting diameter and a 0.129-inch length of cut, this tool is built for tight-tolerance work in small-feature applications. The four-flute, right-hand spiral geometry with a 30-degree helix angle promotes efficient chip evacuation while maintaining a clean, stable cut. The bright, uncoated finish makes it well-suited for materials where coating adhesion is unnecessary or where regrinding is anticipated. Machinists and tool-and-die professionals rely on this class of end mill for intricate slot milling, profiling, and plunge operations on CNC machining centers and manual mills.

This end mill is used in precision machining environments where small-diameter tooling is required. Its 0.125-inch shank diameter fits standard collet chucks and ER-series tool holders commonly found in CNC vertical machining centers. The 1.5-inch overall length keeps the tool rigid, reducing deflection during fine-detail cuts in die cavities, mold features, and miniature components. It is appropriate for both prototype shops and production environments handling small, intricate workpieces that require repeatable accuracy.

Key Features

• 0.043-inch cutting diameter for micro and small-feature milling
• Solid carbide micrograin construction for rigidity and wear resistance
• Four-flute, right-hand spiral flute configuration for efficient chip removal
• 30-degree helix angle balances cutting forces and surface finish quality
• Centercutting design allows direct plunge entry into the workpiece
• Bright, uncoated finish suitable for regrinding and non-ferrous or ferrous applications where coating is not required

Compatibility

Designed for use in standard 0.125-inch collet chucks and ER-series tool holders on CNC machining centers and manual mills requiring a square-end, single-end carbide end mill in this diameter range.

Installation Notes

Installation should be performed by a qualified machinist following shop safety protocols. Ensure the spindle is fully stopped and the machine is powered down or placed in an e-stop state before changing tooling. Seat the shank fully and evenly in the collet to the recommended grip depth to minimize runout and prevent pullout under cutting loads. Verify collet condition and holder concentricity before use, as worn holders significantly reduce tool life at this diameter.