Promax 129-42014 Corner Radius End Mill 5/16 in 4 Flute

Product Description

The PROMAX 129-42014 is a solid carbide corner radius end mill designed for precision milling operations in metalworking and machining applications. It features a 5/16 inch diameter with a 0.03 inch corner radius, a 4-flute spiral configuration, and a 40-degree helix angle. The cutting edges are finished with an AlTiN (aluminum titanium nitride) coating, which improves heat resistance and extends tool life when cutting hardened steels, stainless, and high-temperature alloys. Machined from micrograin carbide stock, the tool maintains edge sharpness through demanding cuts. This is a single-end, right-hand cut tool from PROMAX Series 129.

This end mill is suited for finish and semi-finish milling passes where a controlled corner radius is required to reduce stress concentrations in pocketed or profiled features. The 3/4 inch length of cut and 2-1/2 inch overall length make it appropriate for standard-depth slot milling, profiling, and contouring work on CNC machining centers and manual mills. It is typically used by machinists and toolroom technicians working with ferrous metals, tool steels, and aerospace-grade alloys.

Key Features

• 5/16 inch mill diameter with 0.03 inch corner radius for controlled edge blending
• 4-flute spiral design with 40-degree helix angle for efficient chip evacuation
• AlTiN coating provides thermal resistance during high-speed cuts in hard materials
• Micrograin solid carbide construction for rigidity and edge retention
• Right-hand cut, single-end configuration for standard CNC and manual mill use
• Corner radius tolerance held to +0.001 to -0.001 inches for consistent part geometry

Compatibility

Designed as an OEM-style replacement and standard tooling option for CNC machining centers and manual milling machines accepting a 5/16 inch straight shank end mill.

Installation Notes

Installation and tool changes should be performed by a qualified machinist with the spindle fully stopped and the machine in a locked-out, de-energized state. Seat the 5/16 inch shank securely in a matching collet or end mill holder and verify runout before cutting. Do not exceed the recommended depth of cut for the 3/4 inch length of cut. Note that this tool is not centercutting and cannot be plunged directly into a workpiece.