Accupro 313278 Corner Radius End Mill 1/2 in 2 Flute Zrn

Product Description

The ACCUPRO 313278 is a solid carbide corner radius end mill designed for precision milling operations where edge integrity and chip evacuation are critical. The tool measures 0.5 inches in diameter with a 0.6250-inch length of cut and a 3-inch overall length. It carries a ZrN (zirconium nitride) coating that improves surface hardness and reduces tool wear during extended runs. The 45-degree helix angle promotes efficient chip flow, and the centercutting geometry allows both plunge and ramp entry. Micrograin carbide construction delivers consistent performance in demanding cutting conditions.

This end mill is suited for milling ferrous and non-ferrous materials in shop and production environments. The corner radius end type — with a 0.0200-inch corner radius — reduces stress concentration at the cutting edge and produces a controlled radius at the floor of a pocket or slot. Single-end configuration with a right-hand flute direction and right-hand cutting direction makes this a standard-orientation tool for conventional CNC machining centers and manual knee mills. Typical applications include finish milling, shoulder milling, and ramping cuts in tool steels, alloy steels, and aluminum.

Key Features

• Solid micrograin carbide construction for rigidity and edge retention
• ZrN coating extends tool life and reduces built-up edge on difficult materials
• 0.0200-inch corner radius reduces edge chipping and produces repeatable floor radii
• 45-degree helix angle with spiral flutes for efficient chip evacuation
• Centercutting design enables direct plunge entry without pre-drilling
• Right-hand cut, right-hand flute, single-end configuration — compatible with standard CNC spindle toolholding

Compatibility

Designed as a standard single-end corner radius end mill with a 1/2-inch shank diameter, compatible with ER collet chucks, end mill holders, and shrink-fit toolholders that accept 1/2-inch straight shanks on CNC machining centers and manual mills.

Installation Notes

Installation should be performed by a qualified machinist following the toolholder manufacturer torque and runout specifications. Verify spindle taper, collet size, and holder bore before mounting. Confirm shank seating depth provides adequate clamping engagement without contacting the flute. Inspect the cutting edge and coating condition before each use; a chipped corner radius end mill should not be returned to service without regrinding or replacement.