Accupro 313811 Corner Radius End Mill 1/4 in Solid Carbide

Product Description

The ACCUPRO 313811 is a solid carbide corner radius end mill designed for precision milling of metals and engineered materials. With a 0.250 inch mill diameter and a 0.015 inch corner radius, it produces radiused inside corners that reduce stress concentrations and improve surface finish in finished workpieces. The 45-degree helix angle and two-flute geometry promote efficient chip evacuation, and the ZrN (Zirconium Nitride) coating adds hardness and lubricity for extended tool life in dry or semi-dry cutting applications. This is a single-end, centercutting tool suitable for plunge milling, slotting, and peripheral milling operations performed by machinists and toolroom technicians.

This end mill is built for use in CNC machining centers and conventional knee mills operating on ferrous and non-ferrous workpieces. The extended reach configuration, with a 1.125 inch reach length and a reduced neck diameter of 0.225 inches, allows access to deep pockets and stepped features without repositioning or tooling changes. It is commonly selected for die and mold work, aerospace components, and precision part production where tight tolerances and clean corner geometry are required.

Key Features

• 0.015 inch corner radius reduces stress risers and improves corner finish in milled pockets
• ZrN coating increases surface hardness and reduces friction for longer tool life
• 45-degree helix angle with 2-flute spiral geometry promotes smooth chip flow
• Extended reach design with 1.125 inch reach length accesses deep features
• Centercutting capability allows direct plunge entry without pre-drilling
• Micrograin solid carbide construction provides rigidity and wear resistance

Compatibility

Designed as a standard shank end mill with a 1/4 inch shank diameter, compatible with 1/4 inch collets, end mill holders, and hydraulic or shrink-fit toolholders commonly used in CNC machining centers and manual mills.

Installation Notes

Installation should be performed by a qualified machinist familiar with tool presetting and runout verification. Ensure the spindle and toolholder are clean and free of chips before seating the tool. Verify shank engagement depth meets the toolholder manufacturer minimum before tightening. Confirm spindle speed and feed rate are appropriate for the workpiece material and cutting conditions before engaging the cut.