Accupro 12178650 Corner Radius End Mill 1/4 in 5 Flute Altin

Product Description

The ACCUPRO 12178650 is a single-end, corner radius end mill ground from micrograin solid carbide and coated with AlTiN (aluminum titanium nitride) for high-temperature cutting performance. It carries a 1/4-inch cutting diameter, a 3/8-inch length of cut, and a 0.015-inch corner radius that reduces edge chipping on workpiece corners. Five right-hand spiral flutes with a variable index configuration minimize harmonic vibration during aggressive milling passes. Designed for machinists and tool-and-die professionals running CNC machining centers, this end mill handles hardened steels, stainless, and cast iron where heat resistance and edge retention are critical.

This end mill is suited for finish and semi-finish milling operations in job shops, production facilities, and tool rooms. The centercutting geometry allows plunge entry directly into the workpiece, adding flexibility for pocket milling, slotting, and profiling. The 1/4-inch shank fits standard ER collet chucks and end mill holders common on vertical and horizontal machining centers. The 2-inch overall length provides adequate reach for most shallow-pocket and contour work without excessive overhang.

Key Features

• 0.015-inch corner radius reduces stress concentration and extends tool life at workpiece edges
• AlTiN coating provides oxidation resistance and hardness at elevated cutting temperatures
• 5-flute, variable-index design dampens chatter for improved surface finish
• Centercutting end geometry enables direct plunge milling without a pre-drilled entry hole
• Micrograin solid carbide substrate delivers consistent edge sharpness and rigidity
• Right-hand cut and right-hand spiral flute direction for standard CNC spindle compatibility

Compatibility

Designed as an OEM-style replacement or direct-fit tooling option for 1/4-inch shank end mill holders and ER collet systems on standard CNC machining centers.

Installation Notes

Installation should be performed by a qualified machinist or CNC operator. Secure the shank fully within the collet or end mill holder to the recommended gauge-line depth before torquing the retention nut. Verify spindle runout with a test indicator after tool installation to protect the corner radius geometry. Follow the machine tool manufacturer guidelines and applicable shop safety procedures when changing rotating tooling.