Promax 129-41214 Corner Radius End Mill 3/16 in 4 Flute

Product Description

The PROMAX 129-41214 is a single-end corner radius end mill ground from micrograin solid carbide and coated with AlTiN for extended tool life in demanding cutting applications. It carries a 3/16 inch diameter with a 0.03 inch corner radius, a 5/8 inch length of cut, and a 2 inch overall length. The 40-degree right-hand spiral helix and 4-flute geometry provide efficient chip evacuation and a smooth finish on ferrous and non-ferrous workpiece materials. The AlTiN coating adds thermal hardness, making this tool well suited for dry or semi-dry machining at elevated speeds. This end mill is installed and used by machinists, tool and die makers, and CNC operators working in precision shop environments.

This end mill is designed for milling operations that require a defined corner radius rather than a sharp 90-degree edge. Typical applications include profile milling, pocket contouring, and finishing passes where a blended radius is required at the base of a wall or shoulder. The 3/16 inch shank diameter matches the cutting diameter, allowing direct clamping in standard collets or end mill holders without adapters. It is suited for use on CNC machining centers and manual mills handling steel, stainless steel, cast iron, aluminum, and similar engineering materials.

Key Features

• Micrograin solid carbide construction for rigidity and wear resistance
• AlTiN coating supports high-temperature cutting and extends tool life
• 0.03 inch corner radius reduces stress concentration at milled edges
• 40-degree helix angle promotes smooth chip flow and surface finish
• Right-hand cut, right-hand flute spiral for conventional milling setups
• Single-end design; not center-cutting - requires a pre-drilled or pre-milled entry point for plunge operations

Compatibility

Designed as a direct-fit replacement for Series 129 corner radius end mills with a 3/16 inch shank diameter, compatible with standard collet chucks, shrink-fit holders, and end mill holders accepting a 3/16 inch straight shank.

Installation Notes

Installation and tool changes must be performed with the machine spindle fully stopped and the control in an e-stop or lockout state per shop safety procedures. Seat the shank fully into the holder and torque the retention mechanism to the tool holder manufacturer specification. This tool is not center-cutting; do not plunge directly into solid material. Verify runout with a dial indicator after clamping to maintain tolerances within the stated mill diameter tolerance range.