Accupro 12178705 Corner Radius End Mill 1/4 in 7 Flute

Product Description

The ACCUPRO 12178705 is a solid carbide corner radius end mill designed for precision milling in demanding metalworking applications. Built from micrograin solid carbide and coated with AlTiN (aluminum titanium nitride), it delivers high heat resistance and extended tool life in ferrous and hardened materials. The 7-flute, single-end design with a 0.0200-inch corner radius produces clean edge breaks and reduces stress concentrations on finished workpiece corners. A 37-degree helix angle promotes smooth chip evacuation and reduces cutting forces. This tool is installed by CNC machinists and tool-and-die professionals running vertical or horizontal machining centers.

This end mill is suited for finish and semi-finish milling operations in steel, stainless steel, cast iron, and high-temperature alloys. The centercutting geometry allows plunge entry, making it practical for pocket milling, contouring, and slot work where a controlled corner radius is required on part geometry. The right-hand flute direction and right-hand cutting orientation match standard CNC spindle configurations. Variable index flute spacing reduces harmonic chatter at higher feed rates, improving surface finish on tight-tolerance features.

Key Features

• Micrograin solid carbide substrate for rigidity and wear resistance in hard materials
• AlTiN coating provides thermal barrier for dry or minimal-lubrication cutting
• 7 flutes with variable index spacing reduce chatter and improve surface finish
• 0.0200-inch corner radius with a tolerance of plus or minus 0.00150 inches for consistent edge geometry
• Centercutting design supports plunge entry for pocket and slot operations
• 37-degree helix angle promotes efficient chip evacuation and reduced cutting forces

Compatibility

Designed as a standard shank end mill for use in CNC machining centers, knee mills, and similar equipment accepting a 1/4-inch shank with right-hand spindle rotation.

Installation Notes

Installation is performed by a qualified CNC machinist or toolroom technician. Secure the 1/4-inch shank in a compatible collet, end mill holder, or shrink-fit toolholder, ensuring the holder is clean and free of debris before clamping. Confirm spindle direction is set to right-hand rotation before engaging the cut. Follow machine manufacturer guidelines for runout tolerance and tool projection length to maintain dimensional accuracy at the stated corner radius tolerance.