Osg 5209100 Square End Mill 5/32 in 2 Flute Cobalt

Product Description

The OSG 5209100 is a 2-flute cobalt square end mill designed for milling operations on ferrous and high-temperature alloy workpieces. Built from M42 cobalt high-speed steel, it delivers heat resistance and edge retention in demanding cutting applications. The tool measures 0.1563 inches (5/32 inches) in mill diameter with a 7/16 inch (0.4375 inch) length of cut and an overall length of 2-5/16 inches (2.3125 inches). The 30-degree helix angle promotes smooth chip evacuation and reduces cutting forces. Centercutting geometry allows plunge entry. This is a single-end, bright uncoated tool from OSG Series 520, used by machinists and tool-and-die professionals in production and job shop environments.

This end mill is suited for slotting, profiling, and peripheral milling in ferrous metals and specialty alloys. The 3/8 inch shank diameter fits standard collet chucks and end mill holders used on CNC machining centers and manual knee mills. The regular length designation makes it appropriate for general-purpose work where extended reach is not required. It is a practical choice for shops cutting stainless steel, tool steel, and similar materials where cobalt grade tooling outperforms standard HSS.

Key Features

• M42 cobalt construction for elevated heat and wear resistance in hard or abrasive materials
• 2-flute geometry supports chip clearance in slotting and plunge milling operations
• 30-degree right-hand helix reduces cutting forces and improves surface finish
• Centercutting design allows direct plunge entry without pre-drilling
• Bright uncoated finish suitable for use with cutting fluids on ferrous workpieces
• Single-end configuration with 3/8 inch shank for broad collet and holder compatibility

Compatibility

Designed for use in standard collet chucks and end mill holders accepting a 3/8 inch shank diameter, compatible with CNC machining centers and manual milling machines equipped for that shank size.

Installation Notes

Installation should be performed by a qualified machinist following standard toolholding procedures. Ensure the spindle is fully stopped and locked before inserting or removing the tool from any holder. Secure the shank to the full depth recommended by the holder manufacturer to avoid pullout under load. Verify runout with a dial indicator before engaging the workpiece, particularly in finish-pass or close-tolerance applications.