Osg 5821400 Square End Mill 0.5906 in 2 Flute Cobalt

Product Description

The OSG 5821400 is a cobalt square end mill designed for general-purpose milling in ferrous and non-ferrous metals. Built from M42 cobalt high-speed steel, it delivers reliable heat resistance and edge retention in demanding cutting environments. The tool features a 0.5906-inch cutting diameter, a 1-1/8-inch length of cut, and a 30-degree helix angle with spiral fluting. It is a double-end, centercutting design, allowing direct plunge entry into workpiece material. Right-hand cut and right-hand flute orientation make it compatible with standard milling machine spindles. Machinists, tool-and-die makers, and CNC operators are the primary users of this tool.

The 5821400 is suited for milling operations in job shops, production environments, and maintenance machining. The 5/8-inch shank diameter fits standard milling chucks and collets. At 4-1/2 inches overall length with a regular-length classification, this end mill is appropriate for general slotting, profiling, and peripheral milling on manual and CNC knee mills, vertical machining centers, and similar equipment. The uncoated finish makes it a practical choice for operators who sharpen and recondition tooling in-house.

Key Features

• 0.5906-inch (15.00 mm) cutting diameter with 1-1/8-inch length of cut
• M42 cobalt HSS construction for improved heat and wear resistance over standard M2 HSS
• 30-degree helix angle with spiral fluting for smooth chip evacuation
• Centercutting design enables direct plunge milling without pre-drilling
• Double-end configuration extends tool life by providing two usable cutting ends
• Right-hand cut, right-hand flute — fits standard milling spindle setups
• Uncoated finish allows in-house regrinding and reconditioning

Compatibility

Designed for use in standard milling chucks, ER collet systems, and side-lock holders accepting a 5/8-inch shank. Part of the OSG Series 582 cobalt double-end square end mill line.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Ensure the machine spindle is fully stopped and locked out before changing tooling. Verify chuck or collet runout is within acceptable tolerance before beginning a cut, as excessive runout accelerates edge wear on cobalt tooling. Follow shop-standard speeds and feeds for M42 cobalt end mills based on workpiece material.