Accupro 12183521 Corner Radius End Mill 5/16 in 4 Flute Altin

Product Description

The ACCUPRO 12183521 is a solid carbide corner radius end mill designed for precision milling in ferrous and hardened materials. It features a 5/16-inch diameter, a 0.09-inch corner radius, and an AlTiN (aluminum titanium nitride) coating that improves heat resistance and extends tool life at elevated cutting speeds. With 4 flutes and a right-hand spiral flute direction, it delivers efficient chip evacuation and a fine surface finish. The long-length geometry provides 1 inch of cut length and 4 inches of overall length, giving machinists access in deeper cavities. This end mill is intended for use in CNC machining centers and manual mills by skilled machinists and tool-and-die professionals.

This end mill is suited for profiling, contouring, and slotting operations where a radiused corner is required to reduce stress concentrations in the workpiece. The centercutting design allows plunge entry, adding versatility in complex milling programs. The long overall length of 4 inches makes it appropriate for applications requiring extended reach. It is commonly used in job shops, production machining, and mold-and-die work on steel, stainless, cast iron, and high-temperature alloys where AlTiN coating performance is an advantage.

Key Features

• Solid carbide micrograin construction for rigidity and edge retention
• AlTiN coating provides thermal barrier for dry or high-speed cutting
• 0.09-inch corner radius reduces workpiece stress and improves tool life at corners
• Centercutting capability allows direct plunge entry without a pilot hole
• Right-hand cut, right-hand spiral with 40-degree helix for smooth chip flow
• Single-end configuration with 4 flutes for balance between chip clearance and finish quality

Compatibility

Designed as an OEM-style replacement or standard tooling selection for CNC machining centers and manual milling machines accepting a 5/16-inch straight shank end mill holder or collet.

Installation Notes

Installation should be performed by a qualified machinist familiar with proper tool-holding torque and runout tolerances. Ensure the spindle and collet or end mill holder are clean and free of chips before seating the shank. Confirm shank engagement depth meets the holder manufacturer's minimum specification before beginning any cut. Never exceed the tool's rated depth of cut or feed rate for the workpiece material.