Accupro 310166 Corner Radius End Mill 5/16 in 4 Flute

Product Description

The ACCUPRO 310166 is a solid carbide corner radius end mill designed for high-performance milling in demanding machining environments. With a 5/16 inch mill diameter and a 0.0600 inch corner radius, it produces a controlled radius transition at the cutting edge, reducing stress concentrations in milled pockets and slots. The 4-flute, right-hand spiral geometry paired with a 38-degree variable index helix promotes smooth chip evacuation and stable cutting action. An AlCrTiN coating provides thermal resistance and extended tool life in hard and abrasive materials. This tool is intended for use by machinists and CNC operators working in job shop, production, and tool-and-die environments.

This end mill is suited for milling steel, alloy steel, stainless steel, and similarly hard workpiece materials where a corner radius profile is required to prevent edge chipping or meet part geometry specifications. The centercutting design allows plunge entry, giving the operator flexibility in ramping, helical interpolation, and direct plunge operations. The straight cylindrical shank accepts standard end mill holders, collet chucks, and shrink-fit tooling with a 5/16 inch bore. With a 7/16 inch length of cut and a 2 inch overall length, it is suited for relatively shallow pocket work and contour milling where a compact reach is acceptable.

Key Features

• Solid micrograin carbide construction for rigidity and wear resistance
• AlCrTiN coating for elevated thermal protection and extended tool life in hard materials
• 38-degree helix with variable index geometry for vibration damping and smooth surface finish
• Centercutting capability supports plunge, ramp, and helical entry paths
• 0.0600 inch corner radius reduces stress concentrations at pocket floors and sidewall transitions
• Right-hand flute direction and right-hand cutting for standard CNC spindle configurations

Compatibility

Designed as an OEM-style replacement or direct-use solid carbide corner radius end mill for standard 5/16 inch bore end mill holders, collet chucks, and shrink-fit tooling used in CNC machining centers and manual milling machines.

Installation Notes

Installation should be performed by a qualified machinist or CNC operator. Secure the shank fully within the holder to the recommended gauge length, ensuring adequate engagement to prevent pullout under cutting loads. Verify spindle direction is set to right-hand rotation before operation. Always reference the machine tool manufacturer and tooling holder specifications when setting runout and clamping torque.