Accupro 12183251 Corner Radius End Mill 5/16 in 4 Flute

Product Description

The ACCUPRO 12183251 is a solid carbide corner radius end mill designed for precision milling operations requiring a radiused corner profile. Built from micrograin solid carbide, it offers rigidity and wear resistance suited to demanding cutting applications. The 1/8-inch corner radius reduces stress concentrations at part corners and improves surface finish in profiling and contouring passes. With a 4-flute, right-hand spiral configuration and a 40-degree helix angle, this tool balances chip evacuation with cutting stability. It is a single-end, centercutting design, meaning it can plunge directly into the workpiece. Intended for use by machinists and tooling professionals on CNC milling machines and manual mills.

This end mill is well suited for profiling, slotting, and contouring operations on ferrous and non-ferrous materials where a radiused edge detail is required. The extra-long length of cut of 1-5/8 inches accommodates deeper passes in pockets and cavities. The 5/16-inch diameter and matching 5/16-inch shank make it compatible with standard collet and end mill holder systems. Typical applications include mold and die work, aerospace components, and precision part manufacturing where corner radius tolerances must be held tightly.

Key Features

• Micrograin solid carbide construction for hardness and wear resistance
• 1/8-inch corner radius with a tolerance of plus or minus 0.00150 inches
• 40-degree helix angle promotes efficient chip flow and reduces cutting forces
• Centercutting design allows direct plunge entry without a pilot hole
• Extra-long length of cut (1-5/8 inches) for deep pocket and cavity work
• Bright/uncoated finish suitable for a wide range of base materials

Compatibility

Designed for use in standard 5/16-inch collets, shrink-fit holders, and end mill holders on CNC and manual milling machines. No specific model compatibility was provided by the manufacturer for this part.

Installation Notes

Installation should be performed by a qualified machinist following the machine tool manufacturer's guidelines. Ensure the spindle is fully stopped and the machine is in a safe, locked-out state before changing tooling. Seat the shank fully into the holder to the recommended engagement depth and torque the retention mechanism per the holder manufacturer's specification. Verify runout after installation before beginning the cut, as excessive runout will accelerate wear and reduce corner radius accuracy.