Promax US556050 Corner Radius End Mill 1/4 in 5 Flute

Product Description

The PROMAX US556050 is a 5-flute, single-end corner radius end mill designed for high-performance milling in demanding materials. Built from micrograin solid carbide and coated with PROMAX PowerLayer, it delivers durability and wear resistance in applications ranging from roughing to finishing. The mill features a 1/4-inch diameter, a 3/8-inch length of cut, and a 0.030-inch corner radius. It runs right-hand cutting and flute direction with a high-helix, spiral flute geometry and a straight cylindrical shank. This tool is intended for use in CNC machining centers and is installed by machinists and toolroom professionals working with precision toolholders.

The US556050 is suited for milling steel, stainless steel, cast iron, superalloys, and titanium. Its stub-length, center-cutting design makes it effective in tight-clearance slots, pockets, and profiling operations where a controlled corner radius is required. The PowerLayer coating supports extended tool life when running at elevated speeds and feeds in ISO material groups P, M, K, and S. It accepts standard straight-bore toolholders with a 1/4-inch bore diameter.

Key Features

• Micrograin solid carbide construction for rigidity and edge retention
• PROMAX PowerLayer coating for wear resistance across hard and abrasive materials
• 5-flute design supports both roughing and finishing in a single tool
• 0.030-inch corner radius reduces stress concentration at the cutting edge
• High-helix, spiral flute geometry promotes chip evacuation and smooth cutting action
• Center-cutting capability allows plunge entry into workpiece material

Compatibility

Designed for use with straight-bore cylindrical toolholders accepting a 1/4-inch shank. Compatible with primary workpiece materials including steel, stainless steel, cast iron, superalloys, and titanium (ISO groups P, M, K, S).

Installation Notes

Installation should be performed by a qualified machinist following the toolholder manufacturer's clamping specifications. Ensure the toolholder bore and collet are clean and free of debris before seating the shank. Confirm runout with a dial indicator before commencing a cut. Do not exceed the tool's rated depth of cut for the material being machined.