Accupro 12182530 Corner Radius End Mill 3/8 in 4 Flute

Product Description

The ACCUPRO 12182530 is a solid carbide corner radius end mill designed for precision milling operations in metal fabrication, moldmaking, and general machining environments. It features a 3/8 inch diameter with a 7/8 inch length of cut and a 0.01 inch corner radius that reduces stress concentration at the bottom of a cut and extends tool life compared to sharp-cornered end mills. The 4-flute spiral geometry provides a balance of chip evacuation and surface finish quality. With a 2.5 inch overall length and matching 3/8 inch shank, this tool fits standard ER collet chucks and end mill holders common in CNC machining centers and manual knee mills. It is supplied in a bright, uncoated finish suited to dry cutting or light lubrication applications in ferrous and non-ferrous materials.

This end mill is intended for use in CNC milling centers, VMCs, and manual mills where a controlled corner radius is required to avoid sharp internal corners in pockets, slots, and profiled features. The single-end, centercutting design allows plunge entry as well as side milling and full-slot cutting. Right-hand flute direction and right-hand cutting orientation are standard for conventional CNC spindle configurations. Machinists working on mold cavities, die components, and close-tolerance pocketing operations will find the tight corner radius tolerance of plus or minus 0.00150 inch and mill diameter tolerance of plus 0.000000 to minus 0.002500 inch appropriate for finishing passes and semi-finish work.

Key Features

• 0.01 inch corner radius with tolerance of plus or minus 0.00150 inch for consistent blended corners
• Micrograin solid carbide construction for rigidity and wear resistance at higher feed rates
• 4-flute spiral geometry balances chip clearance with surface finish quality
• Centercutting design permits direct plunge entry without pre-drilling
• Bright, uncoated finish compatible with dry cutting and standard cutting fluids
• Right-hand cut and right-hand flute direction for standard CNC spindle use

Compatibility

Designed as an OEM-style replacement or direct application tool for CNC machining centers and manual mills using 3/8 inch ER collets, end mill holders, or equivalent toolholding systems. No specific machine model compatibility was provided by the manufacturer for this part number.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. The spindle must be fully stopped and the machine placed in an E-stop or lockout state before inserting or removing the tool from the holder. Ensure the shank is clean and the collet or holder bore is free of chips before tightening to the toolholder manufacturer torque specification. Avoid exceeding the recommended stick-out length, as excessive overhang increases deflection and can cause premature tool failure or dimensional error.