Accupro 311514 Corner Radius End Mill 5/16 in 5-flute

Product Description

The ACCUPRO 311514 is a solid carbide corner radius end mill designed for high-performance milling in demanding machining environments. With a 5/16-inch diameter and a 0.030-inch corner radius, it produces smooth blended transitions at part edges while maintaining dimensional accuracy. The five-flute, right-hand spiral configuration paired with a 38-degree helix angle promotes efficient chip evacuation and reduces chatter at higher feed rates. An AlCrTiN coating provides elevated heat resistance and wear protection, extending tool life in ferrous and hard alloy materials. This end mill is installed and operated by machinists and tooling technicians on CNC milling machines and machining centers.

This tool is suited for finishing and semi-finishing passes on molds, dies, and precision components where corner radii are required. The centercutting geometry allows plunge entry, adding flexibility for pocket milling and slot entry operations. The variable index flute spacing helps suppress vibration during cuts, making it well suited for difficult-to-machine alloys and hardened steels. With a 1-inch length of cut and a 3-inch overall length, it is configured for general-purpose reach without sacrificing rigidity.

Key Features

• 5/16-inch diameter with matching 5/16-inch shank for direct collet mounting
• 0.030-inch corner radius for blended edge transitions and reduced stress concentration
• Five-flute, right-hand spiral with 38-degree helix for aggressive material removal and chip clearing
• AlCrTiN coating for high-temperature wear resistance in ferrous and hardened materials
• Centercutting design enables direct plunge entry without pre-drilling
• Variable index flute spacing reduces harmonic vibration and chatter
• Micrograin solid carbide construction for rigidity and edge retention

Compatibility

Designed as an OEM-style replacement and standard tooling option for CNC milling machines and machining centers accepting 5/16-inch straight shank end mills via ER collet, end mill holder, or compatible toolholder.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Ensure the spindle is fully stopped and locked out before changing tooling. Seat the shank fully into the collet or holder to the recommended engagement depth before torquing the retention nut. Confirm runout with a dial indicator before commencing cuts, as excessive runout will accelerate wear on a fine-tolerance tool of this diameter.