Osg 4559408 Roughing End Mill 5/16 in 4 Flute Cobalt Ticn

Product Description

The OSG 4559408 is a single-end roughing end mill designed for aggressive material removal in metalworking and machining applications. Built from M42 cobalt high-speed steel and finished with a TiCN coating, this tool handles tough ferrous and non-ferrous materials with extended tool life. It measures 0.3125 inches (5/16 inches) in cutting diameter with a 3/8-inch shank diameter, a 3/4-inch length of cut, and a 2.5-inch overall length. The 4-flute, fine-pitch geometry and 30-degree maximum helix angle promote efficient chip evacuation and stable cutting at higher feed rates. Center-cutting capability allows plunge entry without a pilot hole.

This roughing end mill is suited for milling operations on steel, stainless, and similar hard alloys in job shop, tool and die, and production machining environments. The TiCN coating adds surface hardness and reduces friction, making it appropriate for dry or minimal-lubrication cutting where heat buildup is a concern. The right-hand cut and right-hand flute direction are standard for conventional CNC and manual milling setups. Machinists and tool room technicians typically select this series for roughing passes before a finishing end mill is applied.

Key Features

• M42 cobalt HSS construction for improved heat and wear resistance over standard M2 HSS
• TiCN coating increases surface hardness and extends tool life in ferrous materials
• Center-cutting design allows direct plunge entry without pre-drilling
• Fine-pitch, 4-flute geometry supports higher feed rates and smooth chip flow
• 30-degree maximum helix angle for balanced cutting forces and reduced chatter
• Right-hand cut and right-hand flute direction compatible with standard mill spindle rotation

Compatibility

Designed as an OEM-style replacement or direct-fit tooling option for standard milling chucks, collets, and end mill holders accepting a 3/8-inch shank diameter.

Installation Notes

Installation and use should be performed by a qualified machinist or tool room technician. Always ensure the spindle is fully stopped and the machine is powered down before changing tooling. Secure the shank to the specified holding torque for your collet or chuck system per the toolholder manufacturer guidelines. Inspect the cutting edges and coating before each use and remove from service if chipping or coating wear is observed.