Accupro 12183278 Corner Radius End Mill 3/8 in 4 Flute Carbide

Product Description

The ACCUPRO 12183278 is a solid carbide corner radius end mill designed for precision milling operations in metal cutting and machining environments. Built from micrograin solid carbide, this single-end mill features a 3/8-inch diameter with a 0.1250-inch corner radius, four right-hand spiral flutes, and a 40-degree helix angle. The extra-long configuration provides a 1.75-inch length of cut and a 4-inch overall length, making it well suited for deep-pocket milling and profiling work where standard-length tools cannot reach. The bright uncoated finish suits a range of general-purpose ferrous and non-ferrous applications.

This end mill is intended for use in CNC machining centers and manual mills where a corner radius profile is required to reduce stress concentration at the base of a milled feature. The centercutting geometry allows for direct plunge entry. It is typically installed and used by machinist trades, tool-and-die shops, and precision fabrication facilities. The 3/8-inch shank diameter fits standard collets and end mill holders commonly found in production and job-shop environments.

Key Features

• Micrograin solid carbide construction for wear resistance and edge retention
• 0.1250-inch corner radius reduces stress risers and improves surface finish at pocket floors
• 4-flute, right-hand spiral design with 40-degree helix angle for efficient chip evacuation
• Extra-long reach: 1.75-inch length of cut and 4-inch overall length for deep pocket access
• Centercutting geometry allows plunge milling without a pilot hole
• Bright/uncoated finish compatible with a wide range of workpiece materials

Compatibility

Designed as an OEM-style replacement or direct-use solid carbide corner radius end mill for CNC machining centers and manual milling machines accepting a 3/8-inch shank collet or end mill holder.

Installation Notes

Installation should be performed by a qualified machinist following the machine tool manufacturer's toolholding torque and runout specifications. Ensure the machine spindle is fully stopped and locked out before changing tooling. Inspect the collet or end mill holder for wear or contamination before seating the shank. Verify corner radius tolerance and diameter tolerance fall within the part drawing requirements before beginning a production run.