Kennametal 3870459 Corner Radius End Mill 1/4 in 3 Flute

Product Description

The KENNAMETAL 3870459 is a single-end, corner radius end mill designed for material removal in non-ferrous metal applications. Built from submicron-grade solid carbide, it delivers rigidity and edge retention in demanding cutting operations. The tool measures 0.25 inches in diameter with a 1-inch length of cut and a 3-inch overall length. Three right-hand spiral flutes with a high helix angle promote efficient chip evacuation, and the bright uncoated finish is well-suited to non-ferrous materials such as aluminum and copper alloys. The straight cylindrical shank is 0.25 inches in diameter, making it compatible with standard collet and hydraulic toolholding systems. Licensed machinists and CNC operators in job shops, aerospace, and general manufacturing facilities typically run this tool.

The 3870459 belongs to KENNAMETAL Series AADE and is classified as a long-series end mill. Its corner radius end type reduces stress concentration at the cutting edge during roughing passes on non-ferrous metals. The coarse pitch geometry and centercutting design allow it to enter workpieces axially and execute side-milling, slotting, and ramping operations. It is specified by machinists who need a durable, uncoated carbide option for high-speed profiling and pocketing in aluminum, brass, and similar materials where a coating could cause material adhesion.

Key Features

• Submicron-grade solid carbide construction for extended edge life in non-ferrous cutting
• Corner radius end type reduces edge chipping and stress concentration during roughing
• Three right-hand spiral flutes with high helix angle for efficient chip evacuation
• Bright uncoated finish optimized for non-ferrous metal applications
• Centercutting design supports axial plunge, ramping, and slotting operations
• Long-series length of cut at 1 inch provides reach for deep pocket and wall milling

Compatibility

Compatible with HC 1/2 through HC 1-1/4 Hydraulic Sleeves Inch with Inch Bores and HC 20M through HC 32M Hydraulic Sleeves Metric with Inch Bores. The 0.25-inch straight cylindrical shank fits standard ER collet chucks and hydraulic toolholders with a matching bore size.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Ensure the machine spindle is fully stopped and the control is in an e-stop or locked-out state before loading or removing the tool. Seat the shank fully into the toolholder to the recommended gauge-line depth before tightening. Verify runout with a dial indicator after clamping, as excessive runout will accelerate edge wear and reduce surface finish quality on the workpiece.